CVE-2026-85769

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreHIGH confidence

Score 6.5 from GitHub Security Advisory published 2026-09-04. the CNA's CVSS baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:redhat, epss, ghsa
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.5Exploit: None knownExposed: 0

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

A flaw was found in libtpms, a library that provides software TPM 2.0 emulation. When restoring TPM 2.0 state (for example during a virtual machine's power-on or state/migration restore), a malformed state blob can supply an oversized skip-block length that is not validated against the remaining size of the input buffer. This can drive an internal size counter negative, which bypasses a subsequent bounds check due to an unsafe signed-to-unsigned conversion, causing the parser to read memory outside the bounds of the heap buffer holding the state data. Successful exploitation can crash the process hosting libtpms (such as swtpm), resulting in a denial of service of the emulated TPM device and the virtual machine that depends on it. No data corruption or information disclosure was confirmed.

CVSS v3
6.5
EG Score
6.5(high)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

September 4, 2026

Last Modified

September 9, 2026

Advisory Details (3)

Auto-updated Sep 4, 2026
Upstream fix merged — awaiting tagged release. Sources: redhat, github_commit.
generic

GitHub · Where software is built

https://github.com/stefanberger/libtpms/issues/614
github_commit

commit b1462888180d (stefanberger/libtpms)

Fix landed in stefanberger/libtpms commit b1462888180d — awaiting tagged release

https://github.com/stefanberger/libtpms/commit/b1462888180d896af03cae0487e8d45009cc445e
redhat

2528538 – (CVE-2026-85769) CVE-2026-85769 libtpms: libtpms: heap out-of-bounds read in TPM2 state unmarshalling via unchecked block_skip_read() blocksize

https://bugzilla.redhat.com/show_bug.cgi?id=2528538

Vendor Advisories for CVE-2026-85769(2)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libtpms0.10.1-1 ... 0.9.2-3.2+hurd.1 (11 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libtpms0.10.1-1 ... 0.9.2-3.2+hurd.1 (9 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libtpms0.10.1-1 ... 0.9.2-3.2+hurd.1 (9 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 26× in last 7d / 59× 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. 2026-09-19 00:47 UTCEG score recompute
  2. 2026-09-19 00:47 UTCVendor advisory
  3. 2026-09-19 00:47 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-17 23:59 UTCEG score recompute
  6. 2026-09-17 23:59 UTCVendor advisory
  7. 2026-09-17 23:59 UTCGHSA enrichment
  8. 2026-09-17 19:32 UTCEPSS rescore
  9. 2026-09-16 23:11 UTCEG score recompute
  10. 2026-09-16 23:11 UTCVendor advisory
  11. 2026-09-16 23:11 UTCGHSA enrichment
  12. 2026-09-16 14:09 UTCEPSS rescore
  13. 2026-09-16 05:15 UTCEPSS rescore
  14. 2026-09-15 22:23 UTCEG score recompute
  15. 2026-09-15 22:23 UTCVendor advisory
  16. 2026-09-15 22:23 UTCGHSA enrichment
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-14 21:34 UTCVendor advisory
  20. 2026-09-14 21:34 UTCGHSA enrichment
  21. 2026-09-13 20:38 UTCEG score recompute
  22. 2026-09-13 20:38 UTCVendor advisory
  23. 2026-09-13 20:38 UTCGHSA enrichment
  24. 2026-09-12 19:50 UTCEG score recompute
  25. 2026-09-12 19:50 UTCVendor advisory
Show 34 more
  1. 2026-09-12 19:50 UTCGHSA enrichment
  2. 2026-09-11 19:02 UTCEG score recompute
  3. 2026-09-11 19:02 UTCVendor advisory
  4. 2026-09-11 19:02 UTCGHSA enrichment
  5. 2026-09-11 14:53 UTCEPSS rescore
  6. 2026-09-11 14:53 UTCEPSS rescore
  7. 2026-09-10 18:08 UTCEG score recompute
  8. 2026-09-10 18:08 UTCGHSA enrichment
  9. 2026-09-09 17:20 UTCEG score recompute
  10. 2026-09-09 17:20 UTCVendor advisory
  11. 2026-09-09 17:20 UTCGHSA enrichment
  12. 2026-09-08 22:01 UTCEPSS rescore
  13. 2026-09-08 21:17 UTCEG score recompute
  14. 2026-09-08 21:17 UTCGHSA enrichment
  15. 2026-09-08 19:56 UTCGHSA enrichment
  16. 2026-09-08 16:18 UTCEG score recompute
  17. 2026-09-08 16:18 UTCGHSA enrichment
  18. 2026-09-07 14:33 UTCEG score recompute
  19. 2026-09-07 14:33 UTCGHSA enrichment
  20. 2026-09-07 13:38 UTCEG score recompute
  21. 2026-09-07 13:37 UTCGHSA enrichment
  22. 2026-09-06 20:55 UTCEG score recompute
  23. 2026-09-06 20:55 UTCGHSA enrichment
  24. 2026-09-06 13:48 UTCEPSS rescore
  25. 2026-09-05 20:06 UTCEG score recompute
  26. 2026-09-05 20:06 UTCGHSA enrichment
  27. 2026-09-05 15:31 UTCEPSS rescore
  28. 2026-09-04 19:19 UTCEG score recompute
  29. 2026-09-04 19:18 UTCGHSA enrichment
  30. 2026-09-04 18:54 UTCEG score recompute
  31. 2026-09-04 18:54 UTCGHSA enrichment
  32. 2026-09-04 18:31 UTCEG score recompute
  33. 2026-09-04 17:54 UTCEG score recompute
  34. 2026-09-04 17:54 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-85769?
CVE-2026-85769 is a medium vulnerability published on September 4, 2026. A flaw was found in libtpms, a library that provides software TPM 2.0 emulation. When restoring TPM 2.0 state (for example during a virtual machine's power-on or state/migration restore), a malformed state blob can supply an oversized skip-block length that is not validated against the remaining…
When was CVE-2026-85769 disclosed?
CVE-2026-85769 was first published in the National Vulnerability Database on September 4, 2026, with the most recent update on September 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-85769 actively exploited?
CVE-2026-85769 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 67.7% of all scored CVEs.
What is the CVSS score of CVE-2026-85769?
CVE-2026-85769 has a CVSS v4.0 base score of 6.5 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-85769?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-85769, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-85769

Explore →

Is Your Infrastructure Affected by CVE-2026-85769?

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

Start Free Scan →Browse All CVEs