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.

Affected Software

VendorProductVersion RangeStatus
OpenSSLOpenSSL3.6.0 < 3.6.2affected
OpenSSLOpenSSL3.5.0 < 3.5.6affected
OpenSSLOpenSSL3.4.0 < 3.4.5affected
OpenSSLOpenSSL3.3.0 < 3.3.7affected
OpenSSLOpenSSL3.0.0 < 3.0.20affected
OpenSSLOpenSSL1.1.1 < 1.1.1zgaffected
OpenSSLOpenSSL1.0.2 < 1.0.2zpaffected

Weaknesses

  • CWE-476: CWE-476 NULL Pointer Dereference

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

Additional References

References