CVE-2026-6681

mediumCVSS 5.3covered by 1 sourcefirst seen 2026-06-25

The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing decoded content to be written past the bounds of the provided buffer. This affects wolfSSL 5.9.0 and earlier and was fixed in the 5.9.1 release.

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Exploitation outlook

Low exploitation risk0.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-6681: The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing deco…nvd · 2026-06-25

External references

NVD record for CVE-2026-6681

CVE.org record

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