CVE-2026-42767
Description
Issue summary: An attacker-controlled CMP (Certificate Management Protocol) server could trigger a NULL pointer dereference in a CMP client application. Impact summary: A NULL pointer dereference causes a crash of the application and a Denial of Service. An attacker controlling a CMP server (or acting as a man-in-the-middle) could craft a CMP response containing a CRMF (Certificate Request Message Format) CertRepMessage with an EncryptedValue structure where the symmAlg field has an algorithm OID but no parameters field. When the OpenSSL CMP client processes this response, the NULL dereference occurs, causing a crash of the CMP client. Applications that process untrusted CMP/CRMF messages may be affected. The FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.
How to fix
- openssl openssl3.0.21, 3.4.6, 3.5.7, 3.6.3 or later
- github.com/openssl/openssl/commit/b90ff3b1bd33b1c18e6a09936d097c2eddef8873
- github.com/openssl/openssl/commit/e6f912907fc2ec82a0fd07aae55172c5e5e3d90d
- github.com/openssl/openssl/commit/810b722f772652ad48042bcc7ab07e3414b11d0f
- github.com/openssl/openssl/commit/665d5254083affde9982efca7c41dd01cacc8774
- github.com/openssl/openssl/commit/61a86a8cd73546c9fea916f3d304c1293e05c046
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| openssl openssl | 3.0.0 ≤ v < 3.0.21, 3.4.0 ≤ v < 3.4.6, 3.5.0 ≤ v < 3.5.7, 3.6.0 ≤ v < 3.6.3, 4.0.0 | 3.0.21, 3.4.6, 3.5.7, 3.6.3 |
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