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CVE-2026-42767 is a NULL pointer dereference in OpenSSL CMP client processing of malformed CMP/CRMF messages. A malicious CMP response containing a CRMF CertRepMessage with an EncryptedValue structure whose symmAlg field specifies an algorithm OID but omits parameters can crash the client during processing. An attacker controlling the CMP server or acting as a man-in-the-middle can trigger the flaw, resulting in denial of service. Applications processing untrusted CMP/CRMF messages may be affected. The OpenSSL FIPS modules in versions 4.0, 3.6, 3.5, 3.4, and 3.0 are unaffected because the vulnerable code is outside the FIPS module boundary; this does not exclude exposure in applications using those modules.
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A malicious CMP server or man-in-the-middle can supply a CRMF CertRepMessage containing an EncryptedValue whose symmAlg has an algorithm OID but lacks parameters. OpenSSL dereferences the missing field, crashing the CMP client and causing denial of service. FIPS modules are unaffected.
An OpenSSL CMP client can crash when a malicious server or man-in-the-middle supplies a CRMF response with an EncryptedValue symmAlg containing an algorithm identifier but missing parameters. Applications processing untrusted CMP/CRMF messages may suffer denial of service. The listed FIPS modules are unaffected.
A NULL pointer dereference in OpenSSL CMP response processing allows an attacker controlling a CMP server, or acting as a man-in-the-middle, to crash a client application. A crafted CRMF CertRepMessage triggers the flaw when its EncryptedValue structure contains a symmAlg algorithm OID without parameters. Applications processing untrusted CMP/CRMF messages may be affected. The plugin reports a CVSS v3 base score of 5.9 (Medium). OpenSSL FIPS modules in versions 4.0, 3.6, 3.5, 3.4, and 3.0 are unaffected because the vulnerable code is outside the FIPS module boundary. The prescribed fix is to update Chainguard libcrypto3 and related packages to version 3.6.3-r0 or later.
A NULL-pointer dereference vulnerability in OpenSSL CMP clients that can be triggered by a malicious CMP server.
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