CVE-2026-42768: Multi-RecipientInfo Bleichenbacher Oracle in CMS_decrypt() and PKCS7_decrypt()
CSIRTS triage
- 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
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.
- Low exploitation riskCVE-2026-427680.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 27% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-42768 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- high[UPDATE] [high] OpenSSL: Multiple Vulnerabilitiescert-bund
- unknownMultiple Vulnerabilities in Microsoft Products (June 22, 2026)cert-fr-avis
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