NULL Pointer Dereference in OpenSSL CRMF EncryptedValue Decryption
CVE-2026-42767 is a low-severity NULL pointer dereference in OpenSSL’s CMP client handling of CRMF EncryptedValue decryption. An attacker controlling a CMP server, or positioned as a man-in-the-middle, can send a crafted CMP response containing a CRMF CertRepMessage with an EncryptedValue structure in which the symmAlg field includes an algorithm OID but omits the parameters field. When a vulnerable OpenSSL CMP client processes this malformed response, it dereferences a NULL pointer and crashes. The issue affects applications that process untrusted CMP/CRMF messages. The vulnerable code is outside the OpenSSL FIPS module boundary, and the FIPS modules in 4.0, 3.6, 3.5, 3.4, and 3.0 are not affected.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
17 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An OpenSSL vulnerability addressed in Alpine Linux 3.22.5 and 3.23.5 as part of the June 9, 2026 OpenSSL advisory.
An OpenSSL vulnerability addressed in Alpine Linux 3.24.1 as part of the June 9, 2026 advisory.
A low-severity OpenSSL CMP/CRMF processing flaw where crafted EncryptedValue structures can trigger a NULL pointer dereference in CMP clients, causing denial of service.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.