Description
CMS (Cryptographic Message Syntax) parsing in gpgsm in GnuPG through 2.5.20 mishandles the CMS format for AES-GCM because aes-ICVlen is supposed to be 12 bytes but 4 bytes is accepted. NOTE: this is related to CVE-2026-34182.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| GnuPG | GnuPG | ≤ 2.5.20 | — |
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 | 2.4.9-5 | — |
| Debian 13 | gnupg2 | No fix yet | — |
| Debian 12 | gnupg2 | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | gnupg2 | 2.4.8-4ubuntu3.1 | USN-8720-1 |
| Ubuntu 25.10 | gnupg2 | No fix yet | — |
| Ubuntu 24.04 LTS | gnupg2 | 2.4.4-2ubuntu17.6 | USN-8720-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | gnupg2 +10 | 2.4.9-18.3.hum1 | RHSA-2026:82418 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | gpg2 | 2.4.4-150600.3.18.1 | SUSE-SU-2026:3243-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | gpg2 | 2.5.5-160000.6.1 | SUSE-SU-2026:22825-1 |
| SLES 16.0 | gpg2 | 2.5.5-160000.6.1 | SUSE-SU-2026:22825-1 |
| SLE Micro 6.2 | gpg2 | 2.5.5-160000.6.1 | SUSE-SU-2026:22757-1 |
| SLE Micro 6.1 | gpg2 | 2.4.4-slfo.1.1_9.1 | SUSE-SU-2026:22923-1 |
| SLE Micro 6.0 | gpg2 | 2.4.4-9.1 | SUSE-SU-2026:23007-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | gpg2 | 2.5.21-1.1 | openSUSE-SU-2026:11213-1 |
| openSUSE Leap 16.0 | gpg2 | 2.5.5-160000.6.1 | openSUSE-SU-2026:21385-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | gnupg2 +2 | 2.3.7-1.amzn2023.0.9 | ALAS2023-2026-1912 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | gnupg2 | 2.4.9-3 | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | gnupg | 2.4.9-r10 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
GitHub 1 repository
-
goldendivider/gpgsm-cve-2026-57062-cms-gcm-short-tag ★ 0 · Sep 5, 2026
gpgsm CVE-2026-57062 exploit POC
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
Advisories 11
- RHSA-2026:82418 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- WID-SEC-2026-2047 GnuPG: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Oct 13, 2026
- USN-8720-1 gnupg2 vulnerability Ubuntu Security Notices (USN) · Sep 3, 2026
- SUSE-SU-2026:23007-1 Security update for gpg2 SUSE / openSUSE Security Updates · Aug 12, 2026
- SUSE-SU-2026:3243-1 Security update for gpg2 SUSE / openSUSE Security Updates · Jul 28, 2026
- SUSE-SU-2026:22923-1 Security update for gpg2 SUSE / openSUSE Security Updates · Jul 28, 2026
- SUSE-SU-2026:22825-1 Security update for gpg2 SUSE / openSUSE Security Updates · Jul 28, 2026
- openSUSE-SU-2026:21385-1 Security update for gpg2 SUSE / openSUSE Security Updates · Jul 24, 2026
- SUSE-SU-2026:22757-1 Security update for gpg2 SUSE / openSUSE Security Updates · Jul 23, 2026
- openSUSE-SU-2026:11213-1 dirmngr-2.5.21-1.1 on GA media SUSE / openSUSE Security Updates · Jul 9, 2026
- ALAS2023-2026-1912 Low: gnupg2 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jul 7, 2026