CVE-2026-88340

An invalid pointer release vulnerability exists in YARA 4.5.8 during deserialization of compiled ...

7.6 High

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.

Attack profile

How easy it is to exploit

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

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: High

Exploit likelihood

0.25%Unchanged since Sep 23, 2026

What each source reports

CVE List Score used 7.6

Record: CVE-2026-88340
CVSS 3.1: 7.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Weakness: CWE-763
Updated: 2026-11-02

EUVDEUVD-2026-84849 7.6

Record: EUVD-2026-84849
CVSS 3.1: 7.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-f27p-cq5g-fr5x 7.6

An invalid pointer release vulnerability exists in YARA 4.5.8 during deserialization of compiled ...

Record: GHSA-f27p-cq5g-fr5x
CVSS 3.1: 7.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Weakness: CWE-763
Updated: 2026-11-02

NVD 7.6

Record: CVE-2026-88340
CVSS 3.1: 7.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Weakness: CWE-763
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-88340 7.6

Record: DEBIAN-CVE-2026-88340
CVSS 3.1: 7.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-88340 7.6

Record: UBUNTU-CVE-2026-88340
CVSS 3.1: 7.6 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/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-2026-88340 is a high vulnerability (CVSS 7.6) in yara, published September 22, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.25%, the 16th percentile. No source names a fixed version.