CVE-2026-24883

Publication date 27 January 2026

Last updated 29 January 2026

Ubuntu priority

Cvss 3 Severity Score

Description

In GnuPG before 2.5.17, a long signature packet length causes parse_signature to return success with sig->data[] set to a NULL value, leading to a denial of service (application crash).

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
gnupg2	25.10 questing	Not affected
	24.04 LTS noble	Not affected
	22.04 LTS jammy	Not affected
	20.04 LTS focal	Not affected
	18.04 LTS bionic	Not affected
	16.04 LTS xenial	Not affected

Notes

mdeslaur

introduced in 2.5.3 by: https://github.com/gpg/gnupg/commit/36dbca3e6944d13e75e96eace634e58a7d7e201d

Patch details

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

Package	Patch details
gnupg2	Upstream: https://dev.gnupg.org/rG11b7e4139e82fcd0cee72f38964444a17c812547 Upstream: https://dev.gnupg.org/rG0437dfc94b2386aa9b49fca60a02bc7226f53c0f Upstream: 11b7e41 Upstream: 0437dfc

Severity score breakdown

Parameter	Value
Base score	3.7 · Low
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	Low
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L