CVE-2022-25235

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 9.8 from GitHub Security Advisory (severity: HIGH) published 2022-02-17. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3

Also known asEUVD-2022-29933 (ENISA EUVD) · GHSA-8mw4-grgw-m3fp (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 5.0%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

xmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks for whether a UTF-8 character is valid in a certain context.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
61
EG Risk 61/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation5.0% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
5.0%
EPSS %ILE
92nd
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
5.0% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)3 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

February 16, 2022

Last Modified

October 14, 2026

Advisory Details (9)

Auto-updated Nov 8, 2026
Patch available. Sources: github_pr.
Web page

[SECURITY] [DSA 5085-1] expat security update

https://www.debian.org/security/2022/dsa-5085
Web page

Expat: Multiple Vulnerabilities (GLSA 202209-24) — Gentoo security

https://security.gentoo.org/glsa/202209-24
Web page

[SECURITY] Fedora 35 Update: mingw-expat-2.4.6-1.fc35 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y27XO3JMKAOMQZVPS3B4MJGEAHCZF5OM/
Web page

[SECURITY] Fedora 34 Update: mingw-expat-2.4.6-1.fc34 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3UFRBA3UQVIQKXTBUQXDWQOVWNBKLERU/
Web pageMentions a patch (unverified)

[SECURITY] [DLA 2935-1] expat security update

https://lists.debian.org/debian-lts-announce/2022/03/msg00007.html
GitHub pull request

[CVE-2022-25235] lib: Protect against malformed encoding (e.g. malformed UTF-8)

Fix merged in libexpat/libexpat PR #562 on 2022-02-18 — awaiting tagged release

https://github.com/libexpat/libexpat/pull/562
Web page

oss-security - Expat 2.4.5 released, includes 5 security fixes

http://www.openwall.com/lists/oss-security/2022/02/19/1

Patch Availability(30)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuxmlrpc-api-utils (1.33.14-1ubuntu1+esm1) @ xenial2026-11-12ubuntu
ubuntulibcableswig-dev (0.1.0+git20150808-2ubuntu0.1~esm1) @ xenial2026-11-12ubuntu
ubuntulibinsighttoolkit3.20 (3.20.1+git20120521-6ubuntu0.1~esm1) @ xenial2026-11-12ubuntu
ubuntuswish-e-dev (2.4.7-6.2ubuntu0.1~esm1) @ noble2026-11-12ubuntu
ubuntulib64expat1 (2.1.0-7ubuntu0.16.04.5+esm2) @ xenial2026-11-12ubuntu
redhatmingw-expat-0:2.4.8-1.el82022-11-08redhat
redhatexpat2022-10-26redhat
redhatexpat-0:2.2.10-12.el9_02022-05-17redhat
redhatxmlrpc-c-0:1.51.0-5.el8_4.12022-04-28redhat
redhatxmlrpc-c-0:1.51.0-5.el8_5.12022-04-28redhat
redhatxmlrpc-c-0:1.51.0-5.el8_1.12022-04-26redhat
redhatxmlrpc-c-0:1.51.0-5.el8_2.12022-04-26redhat
redhatexpat-0:2.0.1-14.el6_102022-04-12redhat
redhatredhat-virtualization-host-0:4.3.22-20220330.1.el7_92022-04-07redhat
redhatexpat-0:2.2.5-3.el8_2.22022-03-28redhat
redhatexpat-0:2.2.5-3.el8_1.12022-03-28redhat
redhatexpat-0:2.1.0-14.el7_92022-03-28redhat
redhatredhat-virtualization-host-0:4.4.10-202203211649_8.52022-03-24redhat
redhatexpat-0:2.2.5-4.el8_4.22022-03-22redhat
redhatexpat-0:2.2.5-4.el8_5.32022-03-16redhat
redhatthunderbird-0:91.7.0-2.el8_12022-03-14redhat
redhatthunderbird-0:91.7.0-2.el8_52022-03-14redhat
redhatthunderbird-0:91.7.0-2.el7_92022-03-14redhat
redhatthunderbird-0:91.7.0-2.el8_22022-03-14redhat
redhatthunderbird-0:91.7.0-2.el8_42022-03-14redhat
redhatfirefox-0:91.7.0-3.el8_52022-03-10redhat
redhatfirefox-0:91.7.0-3.el8_22022-03-10redhat
redhatfirefox-0:91.7.0-3.el8_12022-03-10redhat
redhatfirefox-0:91.7.0-3.el8_42022-03-10redhat
redhatfirefox-0:91.7.0-3.el7_92022-03-10redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(21 across 19 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
expat2.2.10-2, 2.2.10-2+deb11u1
  • every version up to 2.2.10-2+deb11u2: fixed in 2.2.10-2+deb11u2
—
libxmltok1.2-4, 1.2-4.1, 1.2-4.1~exp1, 1.2-4.2
  • every version on: no fix on record
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-1: fixed in 2.4.5-1
—
libxmltok1.2-4, 1.2-4.1, 1.2-4.1~exp1, 1.2-4.2
  • every version on: no fix on record
—
Alpine:v3.12(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.2.10-r2: fixed in 2.2.10-r2
—
Alpine:v3.13(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.2.10-r4: fixed in 2.2.10-r4
—
Alpine:v3.14(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.15(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.16(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.17(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.18(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.19(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-r0: fixed in 2.4.5-r0
—
Debian:10(1)
PackageVulnerable rangeFix by version rangeDependents
expat2.2.6-2, 2.2.6-2+deb10u1, 2.2.6-2+deb10u2
  • every version up to 2.2.6-2+deb10u3: fixed in 2.2.6-2+deb10u3
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-1: fixed in 2.4.5-1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
expat—
  • every version up to 2.4.5-1: fixed in 2.4.5-1
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
expat2.2.0-2, 2.2.0-2+deb9u1, 2.2.0-2+deb9u2, 2.2.0-2+deb9u3, 2.2.0-2+deb9u4
  • every version up to 2.2.0-2+deb9u5: fixed in 2.2.0-2+deb9u5
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(6)

Data Freshness Timeline

(refreshed 19× in last 7d / 83× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed its CVE.org record (CNA or CISA ADP). An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 294 rows on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 194 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:41 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  2. 2026-11-12 16:33 UTCEchelonGraph re-scored
  3. 2026-11-12 16:33 UTCVendor advisory
  4. 2026-11-12 16:33 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  5. 2026-11-12 16:29 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  6. 2026-11-11 16:32 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  7. 2026-11-11 14:08 UTCEchelonGraph re-scored
  8. 2026-11-11 14:08 UTCVendor advisory
  9. 2026-11-11 14:08 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  10. 2026-11-10 16:35 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  11. 2026-11-10 11:44 UTCEchelonGraph re-scored
  12. 2026-11-10 11:44 UTCVendor advisory
  13. 2026-11-10 11:44 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  14. 2026-11-09 16:29 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  15. 2026-11-09 09:21 UTCEchelonGraph re-scored
  16. 2026-11-09 09:21 UTCVendor advisory
  17. 2026-11-09 09:21 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  18. 2026-11-08 16:33 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  19. 2026-11-08 06:58 UTCEchelonGraph re-scored
  20. 2026-11-08 06:58 UTCVendor advisory
  21. 2026-11-08 06:58 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  22. 2026-11-07 16:34 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  23. 2026-11-07 04:35 UTCEchelonGraph re-scored
  24. 2026-11-07 04:35 UTCVendor advisory
  25. 2026-11-07 04:35 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
Show 75 more
  1. 2026-11-06 16:30 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  2. 2026-11-06 02:12 UTCEchelonGraph re-scored
  3. 2026-11-06 02:12 UTCVendor advisory
  4. 2026-11-06 02:12 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  5. 2026-11-05 16:31 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  6. 2026-11-04 23:49 UTCEchelonGraph re-scored
  7. 2026-11-04 23:49 UTCVendor advisory
  8. 2026-11-04 23:49 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  9. 2026-11-04 16:30 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  10. 2026-11-04 00:55 UTCOSV refresh
  11. 2026-11-03 21:26 UTCEchelonGraph re-scored
  12. 2026-11-03 21:26 UTCVendor advisory
  13. 2026-11-03 21:26 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  14. 2026-11-03 16:39 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  15. 2026-11-02 19:02 UTCEchelonGraph re-scored
  16. 2026-11-02 19:02 UTCVendor advisory
  17. 2026-11-02 19:02 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  18. 2026-11-02 16:38 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  19. 2026-11-01 16:39 UTCEchelonGraph re-scored
  20. 2026-11-01 16:38 UTCVendor advisory
  21. 2026-11-01 16:38 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  22. 2026-11-01 16:30 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  23. 2026-10-31 16:29 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  24. 2026-10-31 14:15 UTCEchelonGraph re-scored
  25. 2026-10-31 14:15 UTCVendor advisory
  26. 2026-10-31 14:15 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  27. 2026-10-30 16:30 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  28. 2026-10-30 11:52 UTCEchelonGraph re-scored
  29. 2026-10-30 11:52 UTCVendor advisory
  30. 2026-10-30 11:52 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  31. 2026-10-29 16:29 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  32. 2026-10-29 09:30 UTCEchelonGraph re-scored
  33. 2026-10-29 09:30 UTCVendor advisory
  34. 2026-10-29 09:30 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  35. 2026-10-28 16:28 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  36. 2026-10-28 07:07 UTCEchelonGraph re-scored
  37. 2026-10-28 07:07 UTCVendor advisory
  38. 2026-10-28 07:07 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  39. 2026-10-27 16:28 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  40. 2026-10-27 04:42 UTCEchelonGraph re-scored
  41. 2026-10-27 04:42 UTCVendor advisory
  42. 2026-10-27 04:42 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  43. 2026-10-26 16:28 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  44. 2026-10-25 21:52 UTCVendor advisory
  45. 2026-10-25 21:52 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  46. 2026-10-25 18:12 UTCEchelonGraph re-scored
  47. 2026-10-25 16:29 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  48. 2026-10-24 19:27 UTCEchelonGraph re-scored
  49. 2026-10-24 19:27 UTCVendor advisory
  50. 2026-10-24 19:27 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  51. 2026-10-24 16:29 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  52. 2026-10-23 17:04 UTCEchelonGraph re-scored
  53. 2026-10-23 17:04 UTCVendor advisory
  54. 2026-10-23 17:04 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  55. 2026-10-23 16:28 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  56. 2026-10-22 16:30 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  57. 2026-10-22 14:40 UTCEchelonGraph re-scored
  58. 2026-10-22 14:40 UTCVendor advisory
  59. 2026-10-22 14:40 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  60. 2026-10-21 16:28 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  61. 2026-10-21 12:18 UTCEchelonGraph re-scored
  62. 2026-10-21 12:18 UTCVendor advisory
  63. 2026-10-21 12:18 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  64. 2026-10-20 16:29 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  65. 2026-10-20 09:55 UTCEchelonGraph re-scored
  66. 2026-10-20 09:55 UTCVendor advisory
  67. 2026-10-20 09:55 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  68. 2026-10-19 16:28 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  69. 2026-10-19 07:31 UTCEchelonGraph re-scored
  70. 2026-10-19 07:31 UTCVendor advisory
  71. 2026-10-19 07:30 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8
  72. 2026-10-18 16:28 UTCEPSS rescoreEPSS 5.0% · 92nd percentile
  73. 2026-10-18 05:06 UTCEchelonGraph re-scored
  74. 2026-10-18 05:06 UTCVendor advisory
  75. 2026-10-18 05:06 UTCGHSA enrichmentGHSA-8mw4-grgw-m3fp · GitHub severity HIGH · GitHub CVSS 9.8

Frequently asked(5)

What is CVE-2022-25235?
CVE-2022-25235 is a critical-severity vulnerability; its CVE record was published on February 16, 2022. xmltok_impl.c in Expat (aka libexpat) before 2.4.5 lacks certain validation of encoding, such as checks for whether a UTF-8 character is valid in a certain context.
When was the CVE record for CVE-2022-25235 published?
The CVE record for CVE-2022-25235 was published on February 16, 2022. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 14, 2026; the record at its source may have been updated since.
Is CVE-2022-25235 actively exploited?
CVE-2022-25235 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.0% probability of exploitation in the next 30 days (92nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2022-25235?
CVE-2022-25235 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2022-25235?
A fix for CVE-2022-25235 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2022-25235 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2022-25235

Explore →

Is Your Infrastructure Affected by CVE-2022-25235?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.