What is CVE-2026-22791?

CVE-2026-22791 is a medium-severity vulnerability in Opencryptoki, classified under Incorrect Calculation of Buffer Size. CVSS score: 6.6/10. Published 2026-01-13.

How severe is CVE-2026-22791?

Medium severity. CVSS v3 base score is 6.6 out of 10.

Vulnerability in Opencryptoki

CVE-2026-22791

openCryptoki is a PKCS#11 library and tools for Linux and AIX. In 3.25.0 and 3.26.0, there is a heap buffer overflow vulnerability in the CKM_ECDH_AES_KEY_WRAP implementation allows an attacker with local access to cause out-of-bounds writes in the host process by supplying a compressed EC public key and invoking C_WrapKey. This can lead to heap corruption, or denial-of-service.

Published 2026-01-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.6 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H.

EPSS exploit prediction

EPSS: 0.003 (18.2th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 18.2% 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: 0.003 · change: +0.000

Affected products

Opencryptoki — versions >= 3.25.0, <= 3.26.0
Opencryptoki Project — versions 3.25.0, 3.26.0

Weakness classification (CWE)

CWE-131 — Incorrect Calculation of Buffer Size

References

github.com/opencryptoki/opencryptoki/security/advisories/GHSA-26f5-3mwq-4wm7 (Exploit, Patch, Vendor Advisory)
github.com/opencryptoki/opencryptoki/commit/785d7577e1477d12fbe235554e7e7b24f2d… (Patch)
github.com/opencryptoki/opencryptoki/commit/e37e9127deeeb7bf3c3c4d852c594256c57… (Patch)

Frequently asked questions

What is CVE-2026-22791?: CVE-2026-22791 is a medium-severity vulnerability in Opencryptoki, classified under Incorrect Calculation of Buffer Size. CVSS score: 6.6/10. Published 2026-01-13.
How severe is CVE-2026-22791?: Medium severity. CVSS v3 base score is 6.6 out of 10.