PT-2026-31038 · Openssl · Openssl

Daniel Rhea + 8 · Published 2026-04-07 · Updated 2026-04-07 · CVE-2026-28389

NVD

Issue summary: During processing of a crafted CMS EnvelopedData message with KeyAgreeRecipientInfo 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 KeyAgreeRecipientInfo is processed, the optional parameters field of KeyEncryptionAlgorithmIdentifier 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.

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-28389

Affected Products

Openssl

References · 8

• https://github.com/openssl/openssl/commit/16cea4188e0ea567deb4f93f85902247e67384f5 · Patch
• https://github.com/openssl/openssl/commit/c6725634e089eb2b634b10ede33944be7248172a · Patch
• https://github.com/openssl/openssl/commit/f80f83bc5fd036bc47d773e8b15a001e2b4ce686 · Patch
• https://github.com/openssl/openssl/commit/785cbf7ea3b5a6f5adf0c1ccb92b79d89c35c616 · Patch
• https://github.com/openssl/openssl/commit/7b5274e812400cacb6f3be4c2df5340923fa807f · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-28389 · Security Note
• https://openssl-library.org/news/secadv/20260407.txt · Vendor Advisory
• https://twitter.com/ytroncal/status/2041621382967050497 · Twitter Post