CVE-2026-56132

MEDIUMNVD 6.96.9—
EchelonGraph scoreHIGH confidence

Score 6.9 from GitHub Security Advisory published 2026-06-19. NVD baseline CVSS 6.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
6.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.9Exploit: NoneExposed: 0

A fix is available — apply it.

In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.

CVSS v3
6.9
EG Score
6.9(high)
EG Risk
—
EPSS
1.4%
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-2026-56132] lib: `doProlog`: Fix out-of-bound scaffolding index store

Fix merged in libexpat/libexpat PR #1272 on 2026-06-20 — awaiting tagged release

https://github.com/libexpat/libexpat/pull/1272

Vendor Advisories for CVE-2026-56132(3)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatexpat-main-2.8.2-1.hum12026-06-28redhat

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 8× in last 7d / 66× 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. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-20 17:08 UTCEPSS rescore
  3. 2026-07-19 14:31 UTCEPSS rescore
  4. 2026-07-19 14:31 UTCEPSS rescore
  5. 2026-07-18 10:04 UTCEPSS rescore
  6. 2026-07-16 23:47 UTCVendor advisory
  7. 2026-07-16 23:47 UTCGHSA enrichment
  8. 2026-07-16 17:03 UTCEPSS rescore
  9. 2026-07-15 22:15 UTCVendor advisory
  10. 2026-07-15 22:15 UTCGHSA enrichment
  11. 2026-07-15 16:57 UTCEPSS rescore
  12. 2026-07-15 16:57 UTCEPSS rescore
  13. 2026-07-14 20:43 UTCVendor advisory
  14. 2026-07-14 20:43 UTCGHSA enrichment
  15. 2026-07-13 22:31 UTCEPSS rescore
  16. 2026-07-13 19:09 UTCVendor advisory
  17. 2026-07-13 19:09 UTCGHSA enrichment
  18. 2026-07-12 17:37 UTCVendor advisory
  19. 2026-07-12 17:37 UTCGHSA enrichment
  20. 2026-07-12 05:46 UTCEPSS rescore
  21. 2026-07-11 16:01 UTCVendor advisory
  22. 2026-07-11 16:01 UTCGHSA enrichment
  23. 2026-07-10 14:28 UTCVendor advisory
  24. 2026-07-10 14:28 UTCGHSA enrichment
  25. 2026-07-09 19:10 UTCEPSS rescore
Show 46 more
  1. 2026-07-09 19:10 UTCEPSS rescore
  2. 2026-07-09 12:53 UTCVendor advisory
  3. 2026-07-09 12:53 UTCGHSA enrichment
  4. 2026-07-08 15:16 UTCEPSS rescore
  5. 2026-07-08 15:16 UTCEPSS rescore
  6. 2026-07-08 11:17 UTCVendor advisory
  7. 2026-07-08 11:17 UTCGHSA enrichment
  8. 2026-07-07 13:46 UTCEPSS rescore
  9. 2026-07-07 13:46 UTCEPSS rescore
  10. 2026-07-07 09:46 UTCVendor advisory
  11. 2026-07-07 09:46 UTCGHSA enrichment
  12. 2026-07-06 16:27 UTCEPSS rescore
  13. 2026-07-06 16:27 UTCEPSS rescore
  14. 2026-07-06 08:13 UTCVendor advisory
  15. 2026-07-06 08:13 UTCGHSA enrichment
  16. 2026-07-05 06:14 UTCVendor advisory
  17. 2026-07-05 06:14 UTCGHSA enrichment
  18. 2026-07-05 02:31 UTCEPSS rescore
  19. 2026-07-05 02:30 UTCEPSS rescore
  20. 2026-07-04 04:34 UTCVendor advisory
  21. 2026-07-04 04:34 UTCGHSA enrichment
  22. 2026-07-03 02:58 UTCVendor advisory
  23. 2026-07-03 02:58 UTCGHSA enrichment
  24. 2026-07-02 01:25 UTCVendor advisory
  25. 2026-07-02 01:25 UTCGHSA enrichment
  26. 2026-06-30 23:49 UTCVendor advisory
  27. 2026-06-30 23:49 UTCGHSA enrichment
  28. 2026-06-29 22:17 UTCVendor advisory
  29. 2026-06-29 22:17 UTCGHSA enrichment
  30. 2026-06-29 14:06 UTCEPSS rescore
  31. 2026-06-29 14:06 UTCEPSS rescore
  32. 2026-06-28 20:46 UTCGHSA enrichment
  33. 2026-06-28 04:56 UTCEPSS rescore
  34. 2026-06-28 04:56 UTCEPSS rescore
  35. 2026-06-27 19:14 UTCGHSA enrichment
  36. 2026-06-26 17:42 UTCGHSA enrichment
  37. 2026-06-25 16:10 UTCGHSA enrichment
  38. 2026-06-24 14:37 UTCGHSA enrichment
  39. 2026-06-23 21:33 UTCEPSS rescore
  40. 2026-06-23 21:33 UTCEPSS rescore
  41. 2026-06-23 13:05 UTCGHSA enrichment
  42. 2026-06-22 11:32 UTCGHSA enrichment
  43. 2026-06-21 10:00 UTCGHSA enrichment
  44. 2026-06-20 08:27 UTCGHSA enrichment
  45. 2026-06-19 06:55 UTCEG score recompute
  46. 2026-06-19 06:55 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-56132?
CVE-2026-56132 is a medium vulnerability published on June 19, 2026. In libexpat before 2.8.2, there is a heap-based buffer overflow in doProlog in xmlparse.c because scaffold backing array reallocation is mishandled when there is data-structure sharing across parsers.
When was CVE-2026-56132 disclosed?
CVE-2026-56132 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-2026-56132 actively exploited?
CVE-2026-56132 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-56132?
CVE-2026-56132 has a CVSS v3 base score of 6.9 (NVD).
How do I remediate CVE-2026-56132?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-56132, 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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