CVE-2026-91752

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-15. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this weekElevated
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: Elevated riskExposed: 0

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

GNU libextractor before 1.15 contains a stack-based buffer overflow vulnerability in the process_star_office function that sizes a variable-length stack array from attacker-controlled OLE2 stream data. Attackers can craft malicious StarOffice documents that allocate up to 4 MB on the stack, causing stack overflow and crashing any application extracting metadata from the document.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
65(Attend)
EG Risk 65/100SSVC: Attend

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%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
35%
KEV
Not listed

Published

September 15, 2026

Last Modified

September 17, 2026

Advisory Details (5)

Auto-updated Sep 15, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

GNU libextractor before 1.15 Stack Overflow via OLE2 | Advisories | VulnCheck

https://www.vulncheck.com/advisories/gnu-libextractor-before-1.15-stack-overflow-via-ole2
generic

Libextractor - GNU Project - Free Software Foundation

https://www.gnu.org/software/libextractor/
generic

releasing v1.15 - libextractor - GNU libextractor

https://git.gnunet.org/gnunet/libextractor/commit/2781c7e9095f4ddaff4f535d69342f3903b18422.html
generic

fix large stack allocation - libextractor - GNU libextractor

https://git.gnunet.org/gnunet/libextractor/commit/04004eb19033e093938138b09befdf31e71e8522.html
generic🟡 PoC Available

GitHub - Haitam-lazaar/libextractor-ole2-rce: PoC for a Critical stack-based buffer overflow in GNU libextractor ≤ 1.14. A malicious .doc file triggers an unbounded VLA allocation causing unconditional DoS. In multi-threaded environments, it bypasses stack-clash protections for full RCE. · GitHub

https://github.com/Haitam-lazaar/libextractor-ole2-rce

Vendor Advisories for CVE-2026-91752(1)

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 25× in last 7d / 25× 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 11:06 UTCGHSA enrichment
  2. 2026-09-18 22:14 UTCEG score recompute
  3. 2026-09-18 22:14 UTCGHSA enrichment
  4. 2026-09-18 19:28 UTCEPSS rescore
  5. 2026-09-18 09:21 UTCGHSA enrichment
  6. 2026-09-17 20:29 UTCEG score recompute
  7. 2026-09-17 20:29 UTCGHSA enrichment
  8. 2026-09-17 19:39 UTCEG score recompute
  9. 2026-09-17 19:39 UTCGHSA enrichment
  10. 2026-09-17 19:32 UTCEPSS rescore
  11. 2026-09-17 14:30 UTCGHSA enrichment
  12. 2026-09-17 01:30 UTCEG score recompute
  13. 2026-09-17 01:30 UTCGHSA enrichment
  14. 2026-09-17 00:44 UTCEG score recompute
  15. 2026-09-17 00:44 UTCGHSA enrichment
  16. 2026-09-16 16:05 UTCEG score recompute
  17. 2026-09-16 16:05 UTCGHSA enrichment
  18. 2026-09-16 14:09 UTCEPSS rescore
  19. 2026-09-16 05:15 UTCEPSS rescore
  20. 2026-09-16 03:13 UTCGHSA enrichment
  21. 2026-09-15 14:20 UTCEG score recompute
  22. 2026-09-15 14:20 UTCGHSA enrichment
  23. 2026-09-15 01:27 UTCEG score recompute
  24. 2026-09-15 00:45 UTCEG score recompute
  25. 2026-09-15 00:44 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-91752?
CVE-2026-91752 is a high vulnerability published on September 15, 2026. GNU libextractor before 1.15 contains a stack-based buffer overflow vulnerability in the processstaroffice function that sizes a variable-length stack array from attacker-controlled OLE2 stream data. Attackers can craft malicious StarOffice documents that allocate up to 4 MB on the stack, causing…
When was CVE-2026-91752 disclosed?
CVE-2026-91752 was first published in the National Vulnerability Database on September 15, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-91752 actively exploited?
CVE-2026-91752 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 64.5% of all scored CVEs.
What is the CVSS score of CVE-2026-91752?
CVE-2026-91752 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-91752?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-91752, 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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