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CVE-2026-42768 is a low-severity Bleichenbacher-style adaptive chosen-ciphertext vulnerability in OpenSSL's CMS_decrypt() and PKCS7_decrypt() handling of RSA PKCS#1 v1.5 key transport in CMS and S/MIME messages. The issue arises when an attacker can supply crafted CMS or S/MIME messages to a vulnerable application and distinguish outcomes via error codes and/or decryption results. Two exploitation variants are described. In the first, when the decryption API is used without supplying the recipient certificate, OpenSSL iterates across multiple KeyTransRecipientInfo entries instead of stopping at the first successful match, enabling an attacker to include both a legitimate wrapped content-encryption key and a probe ciphertext and use the application's response behavior as a Bleichenbacher oracle. In the second, when a recipient certificate is supplied but no matching recipient is found, a random key is substituted; if the attacker can compare both the error behavior and the resulting decrypted output, this can also expose an oracle. The flaw affects OpenSSL 4.0.0 before 4.0.1, 3.6.0 before 3.6.3, 3.5.0 before 3.5.7, and 3.4.0 before 3.4.6.
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No public exploit code observed for this vulnerability.
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27 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 Bleichenbacher-style oracle vulnerability in CMS_decrypt() and PKCS7_decrypt() that can enable decryption or signing with a victim's private RSA key under narrow conditions.
A security vulnerability in OpenSSL fixed by updating OpenSSL to version 3.5.7; no further details are provided in the content.
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.