CVE-2026-45186

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 63% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
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
38%
KEV
Not listed

Published

May 10, 2026

Last Modified

August 25, 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 ... 2.8.2-1~deb13u1 (25 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 5× in last 7d / 79× 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 207 total refreshes for this CVE.

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

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 August 25, 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 61.7% 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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