What is CVE-2026-41990?

CVE-2026-41990 is a medium-severity vulnerability in Gnupg Libgcrypt, classified under Out-of-bounds Write. CVSS score: 4.0/10. Published 2026-04-23.

How severe is CVE-2026-41990?

Medium severity. CVSS v3 base score is 4.0 out of 10.

Buffer overflow in Gnupg Libgcrypt

CVE-2026-41990

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

Vulnerability class: Buffer Overflow

Published 2026-04-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L.

EPSS exploit prediction

EPSS: 0.002 (7.2th percentile), scored 2026-10-22.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Gnupg Libgcrypt — versions 1.12.0

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

lists.gnupg.org/pipermail/gnupg-announce/2026q2/000503.html (Mailing List, Release Notes)
www.openwall.com/lists/oss-security/2026/04/21/1 (Mailing List, Release Notes)
dev.gnupg.org/T8208 (Broken Link)

Frequently asked questions

What is CVE-2026-41990?: CVE-2026-41990 is a medium-severity vulnerability in Gnupg Libgcrypt, classified under Out-of-bounds Write. CVSS score: 4.0/10. Published 2026-04-23.
How severe is CVE-2026-41990?: Medium severity. CVSS v3 base score is 4.0 out of 10.