CVE-2026-28390

Issue summary: During processing of a crafted CMS EnvelopedData message with KeyTransportRecipientInfo a NULL pointer dereference can happen. Impact summary: Applications that process attacker-controlled CMS data may crash before authentication or cryptographic operations occur resulting in Denial of Service. When a CMS EnvelopedData message that uses KeyTransportRecipientInfo with RSA-OAEP encryption is processed, the optional parameters field of RSA-OAEP SourceFunc algorithm identifier is examined without checking for its presence. This results in a NULL pointer dereference if the field is missing. Applications and services that call CMS_decrypt() on untrusted input (e.g., S/MIME processing or CMS-based protocols) are vulnerable. The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

The following products are affected by CVE-2026-28390 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2026-28390.

URL	Resource
https://github.com/openssl/openssl/commit/01194a8f1941115cd0383bfa91c736dd3993c8bc
https://github.com/openssl/openssl/commit/2e39b7a6993be445fddb9fbce316fa756e0397b6
https://github.com/openssl/openssl/commit/af2a5fecd3e71a29e7568f9c1453dec5cebbaff4
https://github.com/openssl/openssl/commit/ea7b4ea4f9f853521ba34830cbcadc970d2e0788
https://github.com/openssl/openssl/commit/fd2f1a6cf53b9ceeca723a001aa4b825d7c7ee75
https://nvd.nist.gov/vuln/detail/CVE-2026-28390
https://openssl-library.org/news/secadv/20260407.txt
https://www.cve.org/CVERecord?id=CVE-2026-28390