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CVE-2026-42768: Multi-RecipientInfo Bleichenbacher Oracle in CMS_decrypt() and PKCS7_decrypt()

lowCVSS 3.7CVE-2026-42768

CSIRTS triage

Other
What
The vulnerability involves a Bleichenbacher oracle in CMS_decrypt() and PKCS7_decrypt().
Who is affected
Deployments using CMS and PKCS7 decryption.
Urgency
Remediation is low urgency due to the low severity rating.
Action
Update to the latest version of CMS.

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

Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
low — CVSS 3.7
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-42768

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-42768coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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