CVE-2026-45186

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 61% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 5 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity75% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
39%
KEV
Not listed

Published

May 10, 2026

Last Modified

September 16, 2026

Advisory Details (10)

Auto-updated Jul 1, 2026
Patch available. Sources: github_pr, redhat.
redhat Patch Available

2468575 – (CVE-2026-45186) CVE-2026-45186 libexpat: denial of service via crafted XML input

Affected: Red Hat Enterprise Linux 10

https://bugzilla.redhat.com/show_bug.cgi?id=2468575
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-45186
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:29197
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:27201
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:26319
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:23230
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:22721
redhat Patch Available

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:22715
generic

oss-security - libexpat 2.8.1 fixes CVE-2026-45186 (denial of service)

http://www.openwall.com/lists/oss-security/2026/05/11/16
github_pr

[CVE-2026-45186] Prevent attribute collision check DoS

Fix merged in libexpat/libexpat PR #1216 on 2026-05-10 — awaiting tagged release

https://github.com/libexpat/libexpat/pull/1216

Vendor Advisories for CVE-2026-45186(9)

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

Patch Availability(7)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatrhui5/rhua-tp-rhel9:17872412602026-08-24redhat
redhatdiscovery/discovery-ui-rhel9:17821669522026-06-24redhat
redhatlibexpat-2.dll2026-06-22redhat
redhatrhui5/rhua-rhel9:17815257392026-06-16redhat
redhatexpat-0:2.5.0-6.el9_8.12026-06-04redhat
redhatexpat-0:2.5.0-2.el8_102026-06-03redhat
redhatexpat-0:2.7.3-1.el10_2.12026-06-03redhat

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

(9 across 9 ecosystems)
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
expat—2.8.1-r0—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
expat—2.8.1-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
expat—2.8.1-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
expat—2.8.1-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
expat—2.8.1-r0—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
expat2.2.10-2 ... 2.8.2-1~deb13u1 (47 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
expat2.5.0-1 ... 2.8.4-1 (29 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
expat2.7.1-2 ... 2.8.1-1 (9 versions)2.8.2-1~deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
expat2.7.1-2 ... 2.8.0-1 (7 versions)2.8.0-2—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 225 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-45186?
CVE-2026-45186 is a high vulnerability published on May 10, 2026. In libexpat before 2.8.1, the computational complexity of attribute name collision checks allows a denial of service via moderately sized crafted XML input.
When was CVE-2026-45186 disclosed?
CVE-2026-45186 was first published in the National Vulnerability Database on May 10, 2026, with the most recent update on September 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-45186 actively exploited?
CVE-2026-45186 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 60.9% of all scored CVEs.
What is the CVSS score of CVE-2026-45186?
CVE-2026-45186 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-45186?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-45186, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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