CVE-2026-24881In GnuPG before 2.5.17, a crafted CMS (S/MIME) EnvelopedData message carrying an oversized wrapped session key can cause a stack-based buffer overflow in gpg-agent during PKDECRYPT--kem=CMS handling.
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No exploitation reported and no EPSS estimate yet.
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In GnuPG before 2.5.17, a crafted CMS (S/MIME) EnvelopedData message carrying an oversized wrapped session key can cause a stack-based buffer overflow in gpg-agent during PKDECRYPT--kem=CMS handling. This can easily be leveraged for denial of service; however, there is also memory corruption that could lead to remote code execution.
- CVSS
- 9.8 CRITICAL (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-121
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Modified
- Record last updated
- Jul 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
gnupg gnupg gnupg:gnupg | from 2.5.13 before 2.5.17 | NVD |
gpg4win gpg4win gpg4win:gpg4win | from 5.0.0 before 5.0.1 | NVD |
References
- https://dev.gnupg.org/T8044exploit, product
- https://www.openwall.com/lists/oss-security/2026/01/27/8mailing-list, third-party-advisory
- https://access.redhat.com/security/cve/CVE-2026-24881
- https://bugzilla.redhat.com/show_bug.cgi?id=2433480
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-24881.json
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.