CVE-2026-88340

HIGHPre-NVD 7.67.6—
EchelonGraph scoreHIGH confidence

Score 7.6 from GitHub Security Advisory (severity: HIGH) published 2026-09-22. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 7.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
7.6EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 7.6Exploit: None knownExposed services: Not assessed

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

An invalid pointer release vulnerability exists in YARA 4.5.8 during deserialization of compiled .yrc rule files. The vulnerability is caused by insufficient validation of external-variable pointers, which may lead to invalid free in yr_rules_destroy() or wild pointer access in yr_object_create(). An attacker can provide a specially crafted .yrc file that causes memory corruption and application crash.

CVSS v3
7.6
EG Score
7.6HIGHhigh confidence
EG Risk
34
EG Risk 34/100CISA SSVC

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
Severity76% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.3%
EPSS %ILE
14th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 22, 2026

Last Modified

September 25, 2026

Advisory Details (3)

Auto-updated Sep 25, 2026
No patch confirmed yet. Sources: github_pr.
github_pr

fix: validate compiled-rule external variables

Upstream fix in progress (PR #2244 · VirusTotal/yara, state=open)

https://github.com/VirusTotal/yara/pull/2244/changes/8d7bef643ee5fa2381e235bcedf80170a6b00d3b
github_pr

fix: validate compiled-rule external variables

Upstream fix in progress (PR #2244 · VirusTotal/yara, state=open)

https://github.com/VirusTotal/yara/pull/2244
generic

Unvalidated external-variable pointers in the .yrc deserializer cause invalid free in yr_rules_destroy and wild-pointer strdup/strlen in yr_object_create (CWE-763) · Issue #2239 · VirusTotal/yara · GitHub

https://github.com/VirusTotal/yara/issues/2239

Vendor Advisories for CVE-2026-88340(1)

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 rangeFix by version rangeDependents
yara4.2.3-4 ... 4.5.8-1 (16 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
yara4.5.2-1 ... 4.5.8-1 (7 versions)
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
yara4.5.2-1 ... 4.5.8-1 (7 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 27× in last 7d / 48× 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. 2026-10-05 08:01 UTCEG score recompute
  2. 2026-10-05 08:01 UTCGHSA enrichment
  3. 2026-10-04 23:22 UTCEPSS rescore
  4. 2026-10-04 20:43 UTCGHSA enrichment
  5. 2026-10-04 09:25 UTCGHSA enrichment
  6. 2026-10-03 22:07 UTCEG score recompute
  7. 2026-10-03 22:07 UTCGHSA enrichment
  8. 2026-10-03 10:49 UTCGHSA enrichment
  9. 2026-10-02 23:30 UTCEG score recompute
  10. 2026-10-02 23:30 UTCGHSA enrichment
  11. 2026-10-02 12:06 UTCGHSA enrichment
  12. 2026-10-02 00:06 UTCEG score recompute
  13. 2026-10-02 00:05 UTCGHSA enrichment
  14. 2026-10-01 19:51 UTCEPSS rescore
  15. 2026-10-01 12:16 UTCGHSA enrichment
  16. 2026-10-01 00:57 UTCEG score recompute
  17. 2026-10-01 00:57 UTCGHSA enrichment
  18. 2026-09-30 15:04 UTCEPSS rescore
  19. 2026-09-30 13:39 UTCGHSA enrichment
  20. 2026-09-30 02:21 UTCEG score recompute
  21. 2026-09-30 02:21 UTCGHSA enrichment
  22. 2026-09-29 15:04 UTCGHSA enrichment
  23. 2026-09-29 03:46 UTCEG score recompute
  24. 2026-09-29 03:46 UTCGHSA enrichment
  25. 2026-09-28 16:28 UTCEG score recompute
Show 23 more
  1. 2026-09-28 16:28 UTCGHSA enrichment
  2. 2026-09-28 13:52 UTCEPSS rescore
  3. 2026-09-28 05:10 UTCGHSA enrichment
  4. 2026-09-27 17:52 UTCEG score recompute
  5. 2026-09-27 17:52 UTCGHSA enrichment
  6. 2026-09-27 13:48 UTCEPSS rescore
  7. 2026-09-27 06:35 UTCGHSA enrichment
  8. 2026-09-26 19:17 UTCEG score recompute
  9. 2026-09-26 19:17 UTCGHSA enrichment
  10. 2026-09-26 15:59 UTCEPSS rescore
  11. 2026-09-26 07:58 UTCEG score recompute
  12. 2026-09-26 07:58 UTCGHSA enrichment
  13. 2026-09-25 20:39 UTCGHSA enrichment
  14. 2026-09-25 19:55 UTCEG score recompute▲ 7.60
  15. 2026-09-25 19:54 UTCGHSA enrichment
  16. 2026-09-25 19:54 UTCMITRE cvelistV5CVSS v3 → 7.6 · severity → HIGH
  17. 2026-09-24 21:37 UTCEG score recompute
  18. 2026-09-24 21:37 UTCGHSA enrichment
  19. 2026-09-24 14:04 UTCEPSS rescore
  20. 2026-09-23 17:54 UTCEPSS rescore
  21. 2026-09-22 20:32 UTCNVD update
  22. 2026-09-22 19:53 UTCEG score recompute
  23. 2026-09-22 19:52 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88340?
CVE-2026-88340 is a high vulnerability published on September 22, 2026. An invalid pointer release vulnerability exists in YARA 4.5.8 during deserialization of compiled .yrc rule files. The vulnerability is caused by insufficient validation of external-variable pointers, which may lead to invalid free in yrrulesdestroy() or wild pointer access in yrobjectcreate(). An…
When was CVE-2026-88340 disclosed?
CVE-2026-88340 was first published on September 22, 2026, with the most recent update on September 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88340 actively exploited?
CVE-2026-88340 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (14th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-88340?
CVE-2026-88340 has a CVSS v3.1 base score of 7.6 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-88340?
No fix for CVE-2026-88340 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-88340 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-88340

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