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CVE-2026-31790 is an information disclosure vulnerability in OpenSSL's RSA KEM RSASVE encapsulation path. The flaw stems from incorrect failure handling around RSA_public_encrypt(): the affected code checks only whether the return value is non-zero, even though the function returns -1 on error. As a result, a failed RSA encryption operation can be treated as successful during EVP_PKEY_encapsulate() when used with RSA/RSASVE. In that condition, encapsulation may report success, set output lengths, and leave the caller to use the caller-supplied ciphertext buffer as though a valid KEM ciphertext had been produced. If the application performs encapsulation using an attacker-supplied invalid RSA public key without first validating that key, stale or uninitialized contents of the ciphertext buffer can be disclosed to the malicious peer instead of a legitimate encapsulated value. Affected branches include OpenSSL 3.0, 3.3, 3.4, 3.5, and 3.6, and the corresponding FIPS modules in 3.0, 3.1, 3.3, 3.4, 3.5, and 3.6 are also affected.
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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.
25 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific vulnerability in OpenSSL addressed in Alpine Linux stable releases 3.20.10, 3.21.7, 3.22.4, and 3.23.4.
Incorrect failure handling in RSA KEM RSASVE encapsulation in OpenSSL.
Incorrect failure handling in RSA KEM RSASVE encapsulation that could leave encapsulation in an inconsistent state.
Incorrect failure handling in RSA KEM RSASVE encapsulation in OpenSSL.
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.