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CVE-2026-31790 is an information-disclosure vulnerability in OpenSSL RSA/RSASVE key encapsulation. The encapsulation implementation checks only whether RSA_public_encrypt() returns a nonzero value, incorrectly treating its -1 error return as success. Consequently, EVP_PKEY_encapsulate() can report success and set output lengths despite encryption failing, leaving stale or uninitialized data in the caller-provided ciphertext buffer. Applications that encapsulate using an attacker-supplied invalid RSA public key without validating it first may transmit this data to the attacker instead of a valid KEM ciphertext. Affected FIPS modules include those in OpenSSL branches 3.6, 3.5, 3.4, 3.3, 3.1, and 3.0.
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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.
67 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An OpenSSL vulnerability listed as fixed by Oracle Linux 9 advisory ELSA-2026-500440. Its technical details and individual impact are not provided.
An OpenSSL vulnerability listed as fixed by Oracle Linux 10 advisory ELSA-2026-500441. The content does not describe its mechanism or individual impact.
An OpenSSL vulnerability that can disclose uninitialized memory through an invalid RSA public key. Affected RHEL 9 packages have security updates available under RHSA-2026:84572.
An OpenSSL vulnerability in which an invalid RSA public key can cause disclosure of uninitialized memory. The advisory provides security updates for affected RHEL 9 packages.
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.