CVE-2026-88341

A reachable assertion vulnerability exists in YARA 4.5.8 when loading crafted .yrc compiled rule...

5.5 Medium

A reachable assertion vulnerability exists in YARA 4.5.8 when loading crafted .yrc compiled rule files. An attacker can provide a malicious file with an invalid arena configuration (num_buffers=0) that triggers an assertion failure in yr_arena_get_ptr(), causing the application to terminate.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.15%Unchanged since Sep 23, 2026

What each source reports

CVE List Score used 5.5

Record: CVE-2026-88341
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness: CWE-617
Updated: 2026-11-02

EUVDEUVD-2026-84850 5.5

Record: EUVD-2026-84850
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-q333-36q9-7h8m 5.5

A reachable assertion vulnerability exists in YARA 4.5.8 when loading crafted .yrc compiled rule...

Record: GHSA-q333-36q9-7h8m
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness: CWE-617
Updated: 2026-11-02

NVD 5.5

Record: CVE-2026-88341
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness: CWE-617
Updated: 2026-11-02

OSV 5.5

Record: CVE-2026-88341
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-88341 5.5

Record: DEBIAN-CVE-2026-88341
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-88341 5.5

Record: UBUNTU-CVE-2026-88341
CVSS 3.1: 5.5 MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Affected packages

Affected packages
Package	Affected	Fixed
`yara` Debian:12	All versions, plus listed versions 4.2.3-44.3.0-14.3.2-14.4.0-14.5.0-1 Show 11 moreShow less 4.5.0-1~bpo12+14.5.1-14.5.1-1~bpo12+14.5.2-14.5.2-1~bpo12+14.5.3-14.5.4-14.5.5-14.5.6-14.5.7-14.5.8-1	None known
`yara` Debian:13	All versions, plus listed versions 4.5.2-14.5.3-14.5.4-14.5.5-14.5.6-14.5.7-14.5.8-1	None known
`yara` Debian:14	All versions, plus listed versions 4.5.2-14.5.3-14.5.4-14.5.5-14.5.6-14.5.7-14.5.8-1	None known
`yara` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 3.4.0+dfsg-23.4.0+dfsg-2build13.4.0+dfsg-2ubuntu0.1~esm1	None known
`yara` Ubuntu:Pro:18.04:LTS	All versions, plus listed versions 3.6.3+dfsg-1ubuntu13.7.1-1ubuntu13.7.1-1ubuntu23.7.1-1ubuntu2+esm1	None known
`yara` Ubuntu:Pro:20.04:LTS	All versions, plus listed versions 3.9.0-13.9.0-1ubuntu0.1~esm1	None known
`yara` Ubuntu:Pro:22.04:LTS	All versions, plus listed versions 4.1.0-14.1.3-14.1.3-1build14.1.3-1ubuntu0.1~esm1	None known
`yara` Ubuntu:24.04:LTS	All versions, plus listed versions 4.3.2-14.4.0-14.5.0-14.5.0-1build14.5.0-1build2	None known
`yara` Ubuntu:26.10	All versions, plus listed versions 4.5.5-14.5.7-14.5.8-1	None known
`yara` Ubuntu:26.04:LTS	All versions, plus listed versions 4.5.4-14.5.5-1	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-88341 is a medium vulnerability (CVSS 5.5) in yara, published September 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.15%, the 4th percentile. No source names a fixed version.