CVE-2026-57236

HIGHNVD 8.28.2
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.2 under NVD CVSS v3. EPSS exploit probability: 0.4% (37th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3

Also known asEUVD-2026-39419 (ENISA EUVD)Source: ENISA EUVD

8.2EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, calling Document#encoding= with an invalid encoding (e.g., a non-string, or a string containing a null byte) raises an exception, but only after freeing the document's current encoding string without replacing it. The document is left referencing freed memory, so the next call to Document#encoding reads invalid memory, which can cause a segfault or leak freed bytes into a Ruby String. Affects the CRuby (libxml2) implementation only; JRuby is not affected. This vulnerability is fixed in 1.19.4.

CVSS v3
8.2
EG Score
8.2HIGHmedium confidence
EG Risk
37
EG Risk 37/100

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)
Severity82% × 45%
Impact severity (EG Severity): CVSS 8.2 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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.
EPSS PROB
0.4%
EPSS %ILE
37th
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 (8.2): severity, escalated by confirmed exploitation. This CVE's 8.2 is its impact severity (EG Severity), not escalated.

EG Severity
8.2 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-08). 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 every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade 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 every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (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)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (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

June 25, 2026

Last Modified

October 25, 2026

Advisory Details (1)

Auto-updated Jun 26, 2026
Patch available. Sources: github.
GitHub advisoryMentions a patch (unverified)

Possible Use-After-Free when `Nokogiri::XML::Document#encoding=` raises an exception · Advisory · sparklemotion/nokogiri · GitHub

https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-5v8h-3h3q-446p

Vendor Advisories for CVE-2026-57236(5)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatrubygem-nokogiri-0:1.15.7-3.el9sat2026-08-04redhat
redhatrubygem-nokogiri-0:1.17.2-3.el9sat2026-08-04redhat

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

(6 across 6 ecosystems)
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-nokogiri—
  • every version up to 1.19.4-r0: fixed in 1.19.4-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-nokogiri1.11.1+dfsg-2 ... 1.19.4+dfsg-1 (33 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-nokogiri1.13.10+dfsg-2 ... 1.19.4+dfsg-1 (17 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-nokogiri1.18.10+dfsg-1 ... 1.19.4+dfsg-1 (7 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
ruby-nokogiri1.18.10+dfsg-1 ... 1.19.3+dfsg-1 (6 versions)
  • every version up to 1.19.4+dfsg-1: fixed in 1.19.4+dfsg-1
—
RubyGems(1)
PackageVulnerable rangeFix by version rangeDependents
nokogiri1.0.0 ... 1.9.1 (194 versions)
  • every version up to 1.19.4: fixed in 1.19.4
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 35× 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 296 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 196 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 16:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  2. 2026-11-11 16:40 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  3. 2026-11-10 16:44 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  4. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  5. 2026-11-09 12:11 UTCEchelonGraph re-scored
  6. 2026-11-09 12:11 UTCVendor advisory
  7. 2026-11-08 16:40 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  8. 2026-11-07 16:39 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  9. 2026-11-06 16:38 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  10. 2026-11-05 16:38 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  11. 2026-11-04 16:36 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  12. 2026-11-03 16:48 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  13. 2026-11-03 04:50 UTCEchelonGraph re-scored
  14. 2026-11-03 04:50 UTCVendor advisory
  15. 2026-11-02 16:45 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  16. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  17. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  18. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  19. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  20. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  21. 2026-10-27 21:03 UTCEchelonGraph re-scored
  22. 2026-10-27 21:03 UTCVendor advisory
  23. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  24. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  25. 2026-10-25 23:30 UTCEchelonGraph re-scored
Show 75 more
  1. 2026-10-25 23:30 UTCVendor advisory
  2. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  3. 2026-10-25 14:17 UTCEchelonGraph re-scored
  4. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  5. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  6. 2026-10-22 22:48 UTCEchelonGraph re-scored
  7. 2026-10-22 22:48 UTCVendor advisory
  8. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  9. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  10. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  11. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  12. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  13. 2026-10-18 03:29 UTCEchelonGraph re-scored
  14. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  15. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  16. 2026-10-16 15:19 UTCEchelonGraph re-scored
  17. 2026-10-16 15:19 UTCVendor advisory
  18. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  19. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  20. 2026-10-13 22:54 UTCOSV refresh
  21. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  22. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  23. 2026-10-12 15:54 UTCEchelonGraph re-scored
  24. 2026-10-11 19:37 UTCEchelonGraph re-scored
  25. 2026-10-11 16:52 UTCEchelonGraph re-scored
  26. 2026-10-11 14:15 UTCEchelonGraph re-scored
  27. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  28. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  29. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  30. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  31. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  32. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  33. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  34. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  35. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  36. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  37. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  38. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  39. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  40. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  41. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  42. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  43. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  44. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  45. 2026-09-23 08:50 UTCEchelonGraph re-scored
  46. 2026-09-23 08:50 UTCVendor advisory
  47. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  48. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  49. 2026-09-18 07:28 UTCEchelonGraph re-scored
  50. 2026-09-18 07:28 UTCVendor advisory
  51. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  52. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  53. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  54. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  55. 2026-09-14 01:21 UTCEchelonGraph re-scored
  56. 2026-09-14 01:21 UTCVendor advisory
  57. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  58. 2026-09-13 09:40 UTCVendor advisory
  59. 2026-09-12 15:51 UTCEchelonGraph re-scored
  60. 2026-09-12 15:51 UTCVendor advisory
  61. 2026-09-10 09:35 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  62. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  63. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  64. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  65. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  66. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  67. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  68. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  69. 2026-08-30 19:36 UTCEchelonGraph re-scored
  70. 2026-08-30 19:36 UTCVendor advisory
  71. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  72. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  73. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  74. 2026-08-27 23:56 UTCEchelonGraph re-scored
  75. 2026-08-27 23:56 UTCVendor advisory

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-57236?
CVE-2026-57236 is a high-severity vulnerability; its CVE record was published on June 25, 2026. Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.4, calling Document#encoding= with an invalid encoding (e.g., a non-string, or a string containing a null byte) raises an exception, but only after freeing the document's current encoding string without…
When was the CVE record for CVE-2026-57236 published?
The CVE record for CVE-2026-57236 was published on June 25, 2026. 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 25, 2026; the record at its source may have been updated since.
Is CVE-2026-57236 actively exploited?
CVE-2026-57236 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-57236?
CVE-2026-57236 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-57236?
A fix for CVE-2026-57236 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-57236 are linked in the Vendor Advisories panel on this page.

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