CVE-2026-6291

mediumCVSS 6.5covered by 1 sourcefirst seen 2026-06-09

CSIRTS triage

What: Bleichenbacher padding oracle vulnerability in PKCS#7 KTRI RSA PKCS#1 v1.5 decryption.
Who is affected: Users of OpenSSL that implement PKCS#7 decryption.
Urgency: This medium severity issue should be remediated to prevent cryptographic attacks.
Action: Update to the latest version of OpenSSL.

AI-assisted analysis generated from the source advisory — verify against the original.

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Low exploitation risk0.15% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 5% of all EPSS-scored CVEs.

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