CVE-2026-56131

MEDIUMPre-NVD 4.94.9—
EchelonGraph scoreHIGH confidence

Score 4.9 from GitHub Security Advisory published 2026-06-19. a secondary CVSS source baseline 4.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
4.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.9Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation).

CVSS v3
4.9
EG Score
4.9(high)
EPSS
1.2%
KEV
Not listed

Published

June 19, 2026

Last Modified

June 23, 2026

Advisory Details (1)

Auto-updated Jun 22, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
github_pr

[CVE-2026-56131] lib: Protect `XML_ResumeParser` from being called from a handler

Fix merged in libexpat/libexpat PR #1267 on 2026-06-20 — awaiting tagged release

https://github.com/libexpat/libexpat/pull/1267

Vendor Advisories for CVE-2026-56131(2)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 26× in last 7d / 58× 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. 2026-07-06 23:12 UTCEG score recompute
  2. 2026-07-06 23:12 UTCVendor advisory
  3. 2026-07-06 23:12 UTCGHSA enrichment
  4. 2026-07-05 22:15 UTCEG score recompute
  5. 2026-07-05 22:15 UTCVendor advisory
  6. 2026-07-05 22:15 UTCGHSA enrichment
  7. 2026-07-05 02:31 UTCEPSS rescore
  8. 2026-07-05 02:30 UTCEPSS rescore
  9. 2026-07-04 21:19 UTCEG score recompute
  10. 2026-07-04 21:19 UTCVendor advisory
  11. 2026-07-04 21:19 UTCGHSA enrichment
  12. 2026-07-04 06:31 UTCEPSS rescore
  13. 2026-07-04 06:31 UTCEPSS rescore
  14. 2026-07-03 20:21 UTCEG score recompute
  15. 2026-07-03 20:21 UTCVendor advisory
  16. 2026-07-03 20:21 UTCGHSA enrichment
  17. 2026-07-02 19:24 UTCEG score recompute
  18. 2026-07-02 19:24 UTCVendor advisory
  19. 2026-07-02 19:24 UTCGHSA enrichment
  20. 2026-07-01 18:28 UTCEG score recompute
  21. 2026-07-01 18:28 UTCVendor advisory
  22. 2026-07-01 18:28 UTCGHSA enrichment
  23. 2026-07-01 15:07 UTCEPSS rescore
  24. 2026-06-30 17:31 UTCEG score recompute
  25. 2026-06-30 17:31 UTCVendor advisory
Show 33 more
  1. 2026-06-30 17:31 UTCGHSA enrichment
  2. 2026-06-29 16:34 UTCEG score recompute
  3. 2026-06-29 16:34 UTCGHSA enrichment
  4. 2026-06-29 14:06 UTCEPSS rescore
  5. 2026-06-29 14:06 UTCEPSS rescore
  6. 2026-06-28 15:37 UTCEG score recompute
  7. 2026-06-28 15:37 UTCGHSA enrichment
  8. 2026-06-28 14:07 UTCEPSS rescore
  9. 2026-06-28 04:56 UTCEPSS rescore
  10. 2026-06-28 04:56 UTCEPSS rescore
  11. 2026-06-27 14:40 UTCEG score recompute
  12. 2026-06-27 14:40 UTCGHSA enrichment
  13. 2026-06-27 03:08 UTCEPSS rescore
  14. 2026-06-26 13:44 UTCEG score recompute
  15. 2026-06-26 13:43 UTCGHSA enrichment
  16. 2026-06-25 13:49 UTCEPSS rescore
  17. 2026-06-25 12:47 UTCEG score recompute
  18. 2026-06-25 12:47 UTCGHSA enrichment
  19. 2026-06-24 14:05 UTCEPSS rescore
  20. 2026-06-24 11:50 UTCEG score recompute
  21. 2026-06-24 11:50 UTCGHSA enrichment
  22. 2026-06-23 21:33 UTCEPSS rescore
  23. 2026-06-23 21:33 UTCEPSS rescore
  24. 2026-06-23 10:50 UTCEG score recompute
  25. 2026-06-23 10:50 UTCGHSA enrichment
  26. 2026-06-22 09:53 UTCEG score recompute
  27. 2026-06-22 09:52 UTCGHSA enrichment
  28. 2026-06-21 08:55 UTCEG score recompute
  29. 2026-06-21 08:54 UTCGHSA enrichment
  30. 2026-06-20 07:53 UTCEG score recompute
  31. 2026-06-20 07:53 UTCGHSA enrichment
  32. 2026-06-19 06:56 UTCEG score recompute
  33. 2026-06-19 06:56 UTCGHSA enrichment

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-56131?
CVE-2026-56131 is a medium vulnerability published on June 19, 2026. libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation).
When was CVE-2026-56131 disclosed?
CVE-2026-56131 was first published in the National Vulnerability Database on June 19, 2026, with the most recent update on June 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-56131 actively exploited?
CVE-2026-56131 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56131?
CVE-2026-56131 has a CVSS v3 base score of 4.9 (NVD).
How do I remediate CVE-2026-56131?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56131, 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

Explore the affected products and dependency analysis for CVE-2026-56131

Explore →

Is Your Infrastructure Affected by CVE-2026-56131?

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

Start Free Scan →Browse All CVEs