CVE-2026-24883 Null dereference in GnuPG

Low 3.7 Published 27 Jan 2026 Updated 28 Jan 2026

A long signature packet length triggers a null pointer dereference in GnuPG, causing an application crash and denial of service.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-24883?

CVE-2026-24883 is a low-severity vulnerability in GnuPG, published on 27 Jan 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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).

Weakness: CWE-476

Which versions are affected by CVE-2026-24883?

It affects 2 products.

Products include Gnupg Gnupg, Gpg4win Gpg4win.

How do I fix CVE-2026-24883?

Upgrade to a fixed version.

Is CVE-2026-24883 being exploited?

There is no known exploitation of CVE-2026-24883 in the wild and no public exploit code.

Sources

Also known as ECHO-273b-fd6d-3afe, GHSA-7246-cvp4-g68w, JLSEC-2026-566.