CVE-2026-28390

Summary

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.

Impact & exploitability

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://github.com/openssl/openssl/commit/01194a8f1941115cd0383bfa91c736dd3993c8bc ↗

Additional information

• NVD record
• https://github.com/openssl/openssl/commit/01194a8f1941115cd0383bfa91c736dd3993c8bcPatch
• https://github.com/openssl/openssl/commit/2e39b7a6993be445fddb9fbce316fa756e0397b6Patch
• https://github.com/openssl/openssl/commit/af2a5fecd3e71a29e7568f9c1453dec5cebbaff4Patch
• https://github.com/openssl/openssl/commit/ea7b4ea4f9f853521ba34830cbcadc970d2e0788Patch
• https://github.com/openssl/openssl/commit/fd2f1a6cf53b9ceeca723a001aa4b825d7c7ee75Patch
• https://openssl-library.org/news/secadv/20260407.txtAdvisory
• https://cert-portal.siemens.com/productcert/html/ssa-032379.html
• https://cert-portal.siemens.com/productcert/html/ssa-265688.html