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CVE-2026-42771 is a low-severity out-of-bounds read in OpenSSL's email address validation logic used by X509_VERIFY_PARAM_set1_email() and X509_VERIFY_PARAM_add1_email(). An internal helper function uses an incorrect length when validating the local part of an email address. As a result, the 64-octet limit for the local part may not be enforced correctly, and processing a crafted email address can cause memory to be read past the intended bounds. The issue is reachable when an application invokes these APIs on attacker-controlled input, including during S/MIME message validation of a crafted From address. The vulnerable code is outside the OpenSSL FIPS module boundary, so FIPS modules are not affected.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
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.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.