CVE-2026-4424

Publication date 19 March 2026

Last updated 22 May 2026

Ubuntu priority

Cvss 3 Severity Score

Description

A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processing logic due to improper validation of the LZSS sliding window size after transitions between compression methods. A remote attacker can exploit this by providing a specially crafted RAR archive, leading to the disclosure of sensitive heap memory information without requiring authentication or user interaction.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libarchive	26.04 LTS resolute	Fixed 3.8.5-1ubuntu2.1
	25.10 questing	Fixed 3.7.7-0ubuntu3.2
	24.04 LTS noble	Fixed 3.7.2-2ubuntu0.7
	22.04 LTS jammy	Fixed 3.6.0-1ubuntu1.7
	20.04 LTS focal	Fixed 3.4.0-2ubuntu1.5+esm2
	18.04 LTS bionic	Fixed 3.2.2-3.1ubuntu0.7+esm3
	16.04 LTS xenial	Fixed 3.1.2-11ubuntu0.16.04.8+esm3
	14.04 LTS trusty	Fixed 3.1.2-7ubuntu2.8+esm5

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libarchive	Upstream: d379dc0 Upstream: e1907c5

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	None
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

References

Related Ubuntu Security Notices (USN)

USN-8292-1
libarchive vulnerabilities
21 May 2026