Description
GnuPG 2.2.4 and 2.2.5 does not enforce a configuration in which key certification requires an offline master Certify key, which results in apparently valid certifications that occurred only with access to a signing subkey.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | gnupg2 | 2.2.7-1 | — |
| Debian 13 | gnupg2 | 2.2.7-1 | — |
| Debian 12 | gnupg2 | 2.2.7-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | gnupg2 | 2.2.4-1ubuntu1.1 | USN-3675-1 |
| Ubuntu 16.04 LTS | gnupg | 1.4.20-1ubuntu3.2 | USN-3675-1 |
| Ubuntu 14.04 LTS | gnupg | 1.4.16-1ubuntu2.5 | USN-3675-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | gpg2 | 2.0.24-9.14.1 | SUSE-SU-2023:3857-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | gpg2 | 2.0.24-9.14.1 | SUSE-SU-2023:3857-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | gpg2 | 2.2.27-2.4 | openSUSE-SU-2024:10815-1 |
Advisories 6
- USN-3675-1 gnupg, gnupg2 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2024:10815-1 dirmngr-2.2.27-2.4 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- NCSC-2025-0382 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Dec 9, 2025
- SSA-202008 SSA-202008: Multiple Vulnerabilities in Ruggedcom Rox Before V2.17.0 Siemens ProductCERT · Dec 9, 2025
- SUSE-SU-2023:3857-1 Security update for gpg2 SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-2512 GnuPGP: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Jan 28, 2024
References
- https://dev.gnupg.org/T3844
- USN-3675-1 vendor-advisory