PT-2026-31039 · Openssl · Openssl

Chanho Kim + 6 · Published 2026-04-07 · Updated 2026-04-07 · CVE-2026-28390

Mitre

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.

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-28390

Affected Products

Openssl

References · 8

• https://github.com/openssl/openssl/commit/01194a8f1941115cd0383bfa91c736dd3993c8bc · Patch
• https://github.com/openssl/openssl/commit/2e39b7a6993be445fddb9fbce316fa756e0397b6 · Patch
• https://github.com/openssl/openssl/commit/fd2f1a6cf53b9ceeca723a001aa4b825d7c7ee75 · Patch
• https://github.com/openssl/openssl/commit/af2a5fecd3e71a29e7568f9c1453dec5cebbaff4 · Patch
• https://github.com/openssl/openssl/commit/ea7b4ea4f9f853521ba34830cbcadc970d2e0788 · Patch
• https://openssl-library.org/news/secadv/20260407.txt · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-28390 · Security Note
• https://twitter.com/ytroncal/status/2041621382967050497 · Twitter Post