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VulnerabilityPublished

CVE-2026-88341: yara · CVE-2026-88341 is a reachable assertion

Affects yaraSource CVE Database V5

0

Not known to be exploited · CVSS 5.5 Medium.

Data as of 26 Oct 2026, 17:16 UTC

CVSS 3.1 base score
5.5Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 22 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
GitHubvirustotal/yarapkg:github/virustotal/yaraOther threatsAffected
  • =4.5.8
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Users should monitor vendor advisories for updates. Until a fix is available, avoid loading untrusted or crafted .yrc compiled rule files to prevent triggering the assertion failure.

Description

CVE-2026-88341 is a reachable assertion vulnerability in YARA version 4.5.8. It occurs when loading specially crafted compiled rule files (.yrc) with an invalid arena configuration (num_buffers=0), causing an assertion failure that terminates the application. The vulnerability has a medium severity rating with a CVSS score of 5.5 and impacts availability without affecting confidentiality or integrity.

References

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