CVE-2026-76956

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-20. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 4 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 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
22%
KEV
Not listed

Published

August 20, 2026

Last Modified

September 8, 2026

Advisory Details (1)

Auto-updated Aug 20, 2026
No patch confirmed yet. Sources: github_pr.
github_pr

[CVE-REQUESTED] lib: Fix inverted `getentropy()` return in `writeRandomBytes_getentropy`

Upstream fix in progress (PR #1326 · libexpat/libexpat, state=open)

https://github.com/libexpat/libexpat/pull/1326

Vendor Advisories for CVE-2026-76956(3)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatexpat-main-2.8.4-0.1.hum12026-09-08redhat
redhatexpat-main-2.8.3-0.1.1.hum12026-08-27redhat

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

(6 across 6 ecosystems)
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
expat—2.8.4-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
expat—2.8.4-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
expat—2.8.4-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
expat—2.8.4-r0—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
expat2.7.1-2 ... 2.8.4-1 (14 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
expat2.7.1-2 ... 2.8.3-1~deb13u1 (13 versions)2.8.4-1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 43× in last 7d / 180× 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 183 total refreshes for this CVE.

  1. 2026-09-19 06:37 UTCEG score recompute
  2. 2026-09-19 06:37 UTCVendor advisory
  3. 2026-09-19 06:37 UTCGHSA enrichment
  4. 2026-09-18 19:32 UTCEG score recompute
  5. 2026-09-18 19:32 UTCVendor advisory
  6. 2026-09-18 19:32 UTCGHSA enrichment
  7. 2026-09-18 19:28 UTCEPSS rescore
  8. 2026-09-18 08:27 UTCVendor advisory
  9. 2026-09-18 08:27 UTCGHSA enrichment
  10. 2026-09-17 21:25 UTCEG score recompute
  11. 2026-09-17 21:25 UTCVendor advisory
  12. 2026-09-17 21:25 UTCGHSA enrichment
  13. 2026-09-17 07:04 UTCVendor advisory
  14. 2026-09-17 07:04 UTCGHSA enrichment
  15. 2026-09-16 20:03 UTCEG score recompute
  16. 2026-09-16 20:03 UTCVendor advisory
  17. 2026-09-16 20:03 UTCGHSA enrichment
  18. 2026-09-16 14:08 UTCEPSS rescore
  19. 2026-09-16 05:49 UTCEG score recompute
  20. 2026-09-16 05:49 UTCVendor advisory
  21. 2026-09-16 05:49 UTCGHSA enrichment
  22. 2026-09-16 05:15 UTCEPSS rescore
  23. 2026-09-15 18:49 UTCVendor advisory
  24. 2026-09-15 18:49 UTCGHSA enrichment
  25. 2026-09-15 07:33 UTCEG score recompute
Show 75 more
  1. 2026-09-15 07:33 UTCVendor advisory
  2. 2026-09-15 07:33 UTCGHSA enrichment
  3. 2026-09-15 03:12 UTCEPSS rescore
  4. 2026-09-14 20:31 UTCVendor advisory
  5. 2026-09-14 20:31 UTCGHSA enrichment
  6. 2026-09-14 09:30 UTCVendor advisory
  7. 2026-09-14 09:30 UTCGHSA enrichment
  8. 2026-09-13 22:29 UTCEG score recompute
  9. 2026-09-13 22:29 UTCVendor advisory
  10. 2026-09-13 22:29 UTCGHSA enrichment
  11. 2026-09-13 11:29 UTCVendor advisory
  12. 2026-09-13 11:29 UTCGHSA enrichment
  13. 2026-09-13 00:28 UTCEG score recompute
  14. 2026-09-13 00:28 UTCVendor advisory
  15. 2026-09-13 00:28 UTCGHSA enrichment
  16. 2026-09-12 15:02 UTCEPSS rescore
  17. 2026-09-12 13:27 UTCVendor advisory
  18. 2026-09-12 13:27 UTCGHSA enrichment
  19. 2026-09-12 02:26 UTCVendor advisory
  20. 2026-09-12 02:26 UTCGHSA enrichment
  21. 2026-09-11 15:25 UTCEG score recompute
  22. 2026-09-11 15:25 UTCVendor advisory
  23. 2026-09-11 15:25 UTCGHSA enrichment
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-11 04:24 UTCVendor advisory
  26. 2026-09-11 04:24 UTCGHSA enrichment
  27. 2026-09-10 17:23 UTCEG score recompute
  28. 2026-09-10 17:23 UTCVendor advisory
  29. 2026-09-10 17:23 UTCGHSA enrichment
  30. 2026-09-10 09:35 UTCEPSS rescore
  31. 2026-09-10 06:17 UTCVendor advisory
  32. 2026-09-10 06:17 UTCGHSA enrichment
  33. 2026-09-09 19:16 UTCVendor advisory
  34. 2026-09-09 19:16 UTCGHSA enrichment
  35. 2026-09-09 08:15 UTCEG score recompute
  36. 2026-09-09 08:15 UTCVendor advisory
  37. 2026-09-09 08:15 UTCGHSA enrichment
  38. 2026-09-08 22:01 UTCEPSS rescore
  39. 2026-09-08 21:14 UTCEG score recompute
  40. 2026-09-08 21:14 UTCVendor advisory
  41. 2026-09-08 21:14 UTCGHSA enrichment
  42. 2026-09-08 21:11 UTCNVD updateCVSS v3 → 7.5 · severity → HIGH
  43. 2026-09-08 08:27 UTCVendor advisory
  44. 2026-09-08 08:27 UTCGHSA enrichment
  45. 2026-09-07 21:24 UTCEG score recompute
  46. 2026-09-07 21:24 UTCVendor advisory
  47. 2026-09-07 21:24 UTCGHSA enrichment
  48. 2026-09-07 10:23 UTCVendor advisory
  49. 2026-09-07 10:23 UTCGHSA enrichment
  50. 2026-09-06 23:19 UTCEG score recompute
  51. 2026-09-06 23:19 UTCVendor advisory
  52. 2026-09-06 23:19 UTCGHSA enrichment
  53. 2026-09-06 13:48 UTCEPSS rescore
  54. 2026-09-06 12:17 UTCVendor advisory
  55. 2026-09-06 12:16 UTCGHSA enrichment
  56. 2026-09-06 01:15 UTCEG score recompute
  57. 2026-09-06 01:15 UTCVendor advisory
  58. 2026-09-06 01:15 UTCGHSA enrichment
  59. 2026-09-05 14:14 UTCVendor advisory
  60. 2026-09-05 14:14 UTCGHSA enrichment
  61. 2026-09-05 03:13 UTCVendor advisory
  62. 2026-09-05 03:13 UTCGHSA enrichment
  63. 2026-09-04 16:12 UTCEG score recompute
  64. 2026-09-04 16:12 UTCVendor advisory
  65. 2026-09-04 16:12 UTCGHSA enrichment
  66. 2026-09-04 05:08 UTCEG score recompute
  67. 2026-09-04 05:08 UTCVendor advisory
  68. 2026-09-04 05:07 UTCGHSA enrichment
  69. 2026-09-04 05:07 UTCEPSS rescore
  70. 2026-09-03 18:05 UTCVendor advisory
  71. 2026-09-03 18:05 UTCGHSA enrichment
  72. 2026-09-03 14:32 UTCVendor advisory
  73. 2026-09-03 14:32 UTCGHSA enrichment
  74. 2026-09-03 03:31 UTCVendor advisory
  75. 2026-09-03 03:31 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-76956?
CVE-2026-76956 is a high vulnerability published on August 20, 2026. In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content.
When was CVE-2026-76956 disclosed?
CVE-2026-76956 was first published in the National Vulnerability Database on August 20, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-76956 actively exploited?
CVE-2026-76956 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 78.5% of all scored CVEs.
What is the CVSS score of CVE-2026-76956?
CVE-2026-76956 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-76956?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-76956, 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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