CVE-2026-45186

HIGHNVD 7.52.9▼
EchelonGraph scoreMEDIUM confidence

Score 2.9 from GitHub Security Advisory (severity: LOW) published 2026-05-10. NVD baseline CVSS 2.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 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
2.9(medium)
EPSS
34.7%
KEV
Not listed

Published

May 10, 2026

Last Modified

July 15, 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(8)

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

Patch Availability(6)

Vendor / EcosystemFixed in / PatchReleasedSource
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-0:2.7.3-1.el10_2.12026-06-03redhat
redhatexpat-0:2.5.0-2.el8_102026-06-03redhat

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.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 45× 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.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 02:25 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  3. 2026-07-15 02:00 UTCEPSS rescore
  4. 2026-07-15 01:21 UTCMITRE cvelistV5CVSS v3 → 2.9 · severity → LOW
  5. 2026-07-14 13:19 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  6. 2026-07-14 13:11 UTCMITRE cvelistV5CVSS v3 → 2.9 · severity → LOW
  7. 2026-07-14 07:55 UTCOSV refresh
  8. 2026-07-13 22:30 UTCEPSS rescore
  9. 2026-07-13 06:13 UTCEPSS rescore
  10. 2026-07-12 05:46 UTCEPSS rescore
  11. 2026-07-11 08:27 UTCEPSS rescore
  12. 2026-07-09 19:10 UTCEPSS rescore
  13. 2026-07-07 13:46 UTCEPSS rescore
  14. 2026-07-06 16:27 UTCEPSS rescore
  15. 2026-07-06 02:23 UTCEPSS rescore
  16. 2026-07-05 02:30 UTCEPSS rescore
  17. 2026-07-04 06:31 UTCEPSS rescore
  18. 2026-07-01 15:07 UTCEPSS rescore
  19. 2026-06-30 23:22 UTCEPSS rescore
  20. 2026-06-30 04:33 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  21. 2026-06-29 14:06 UTCEPSS rescore
  22. 2026-06-29 14:06 UTCEPSS rescore
  23. 2026-06-28 14:07 UTCEPSS rescore
  24. 2026-06-28 04:56 UTCEPSS rescore
  25. 2026-06-28 04:56 UTCEPSS rescore
Show 71 more
  1. 2026-06-27 03:08 UTCEPSS rescore
  2. 2026-06-26 05:30 UTCEG score recompute
  3. 2026-06-26 05:30 UTCVendor advisory
  4. 2026-06-26 05:30 UTCGHSA enrichment
  5. 2026-06-25 13:49 UTCEPSS rescore
  6. 2026-06-24 14:05 UTCEPSS rescore
  7. 2026-06-23 21:33 UTCEPSS rescore
  8. 2026-06-22 14:25 UTCEPSS rescore
  9. 2026-06-22 14:25 UTCEPSS rescore
  10. 2026-06-21 14:56 UTCEPSS rescore
  11. 2026-06-21 14:56 UTCEPSS rescore
  12. 2026-06-21 01:59 UTCEPSS rescore
  13. 2026-06-19 19:25 UTCEPSS rescore
  14. 2026-06-18 17:52 UTCEPSS rescore
  15. 2026-06-18 17:52 UTCEPSS rescore
  16. 2026-06-17 17:53 UTCEPSS rescore
  17. 2026-06-17 05:38 UTCEG score recompute
  18. 2026-06-17 05:38 UTCVendor advisory
  19. 2026-06-17 05:38 UTCGHSA enrichment
  20. 2026-06-16 17:52 UTCEPSS rescore
  21. 2026-06-15 17:49 UTCEPSS rescore
  22. 2026-06-14 02:15 UTCEG score recompute
  23. 2026-06-14 02:15 UTCVendor advisory
  24. 2026-06-14 02:14 UTCGHSA enrichment
  25. 2026-06-13 23:00 UTCEPSS rescore
  26. 2026-06-12 23:12 UTCEPSS rescore
  27. 2026-06-12 23:12 UTCEPSS rescore
  28. 2026-06-11 14:00 UTCEPSS rescore
  29. 2026-06-10 22:18 UTCEPSS rescore
  30. 2026-06-10 13:22 UTCEPSS rescore
  31. 2026-06-10 13:22 UTCEPSS rescore
  32. 2026-06-10 12:36 UTCEG score recompute
  33. 2026-06-10 12:36 UTCVendor advisory
  34. 2026-06-10 12:36 UTCGHSA enrichment
  35. 2026-06-08 14:17 UTCEPSS rescore
  36. 2026-06-08 14:17 UTCEPSS rescore
  37. 2026-06-07 15:25 UTCEPSS rescore
  38. 2026-06-07 15:25 UTCEPSS rescore
  39. 2026-06-07 10:50 UTCEG score recompute
  40. 2026-06-07 10:50 UTCVendor advisory
  41. 2026-06-07 10:50 UTCGHSA enrichment
  42. 2026-06-06 13:47 UTCEPSS rescore
  43. 2026-06-06 13:47 UTCEPSS rescore
  44. 2026-06-05 22:47 UTCEPSS rescore
  45. 2026-06-04 13:12 UTCEPSS rescore
  46. 2026-06-04 13:12 UTCEPSS rescore
  47. 2026-06-04 09:05 UTCEG score recompute
  48. 2026-06-04 09:05 UTCVendor advisory
  49. 2026-06-04 09:05 UTCGHSA enrichment
  50. 2026-06-02 20:13 UTCEPSS rescore
  51. 2026-06-01 13:52 UTCEPSS rescore
  52. 2026-06-01 13:52 UTCEPSS rescore
  53. 2026-06-01 07:18 UTCEG score recompute
  54. 2026-06-01 07:18 UTCGHSA enrichment
  55. 2026-05-31 22:30 UTCEPSS rescore
  56. 2026-05-31 22:30 UTCEPSS rescore
  57. 2026-05-31 00:16 UTCEPSS rescore
  58. 2026-05-31 00:16 UTCEPSS rescore
  59. 2026-05-29 13:44 UTCEPSS rescore
  60. 2026-05-29 13:44 UTCEPSS rescore
  61. 2026-05-28 13:44 UTCEPSS rescore
  62. 2026-05-28 13:44 UTCEPSS rescore
  63. 2026-05-27 13:40 UTCEPSS rescore
  64. 2026-05-27 13:40 UTCEPSS rescore
  65. 2026-05-26 13:44 UTCEPSS rescore
  66. 2026-05-26 07:18 UTCEPSS rescore
  67. 2026-05-21 22:43 UTCEPSS rescore
  68. 2026-05-20 22:38 UTCEPSS rescore
  69. 2026-05-20 13:25 UTCEG score recompute
  70. 2026-05-20 13:25 UTCGHSA enrichment
  71. 2026-05-20 11:22 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 July 15, 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 34.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-45186?
CVE-2026-45186 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 2.9.
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.

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