CVE-2026-41990

Publication date 23 April 2026

Last updated 27 May 2026

Ubuntu priority

Why this priority?

Cvss 3 Severity Score

Score breakdown

Description

Libgcrypt before 1.12.2 mishandles Dilithium signing. Writes to a static array lack a bounds check but do not use attacker-controlled data.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libgcrypt20	26.04 LTS resolute	Fixed 1.12.0-2ubuntu0.1
	25.10 questing	Not affected
	24.04 LTS noble	Fixed 1.12.0-2ubuntu0.1~Fips1~rc11
	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 1.12.0 with: https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=1b422366e2b3b5438713418b50f8a0a1abf8d365

Patch details

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

Package	Patch details
libgcrypt20	Upstream: https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=905e00f046a71e5670517779afaf85a354952832

Severity score breakdown

CVSS version: CVSS v3.0

Base score 4.0 · Medium

Base metrics

Parameter	Value
Attack vector	Local
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	None
Integrity impact	Low
Availability impact	Low

Scores

Parameter	Value
Base score	4.0 · Medium
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

References

Related Ubuntu Security Notices (USN)

USN-8319-1
Libgcrypt vulnerabilities
27 May 2026

Other references

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