CVE-2026-55961: wolfSSL_PKCS7_verify() reports success for degenerate (certs-only) PKCS#7 with no signer
CSIRTS triage
- What
- The wolfSSL_PKCS7_verify() function incorrectly reports success for degenerate PKCS#7 data that contains no signer.
- Who is affected
- Deployments of wolfSSL that utilize the PKCS7 verification function.
- Urgency
- Remediation is urgent due to the high severity rating, indicating potential security risks.
- Action
- Update to the latest version of wolfSSL that addresses this issue.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55961
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-2026-559610.10% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-55961 | coverage & exploitation status | NVD · CVE.org |
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