CVE-2026-6681 | THREATINT

Description

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.

PUBLISHED Reserved 2026-04-20 | Published 2026-06-25 | Updated 2026-06-26 | Assigner wolfSSL

LOW: 1.0CVSS:4.0/AV:A/AC:L/AT:P/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/U:Clear

Problem types

CWE-787 Out-of-bounds Write

CWE-120 Buffer Copy without Checking Size of Input

Product status

Default status

unaffected

3.10.0 (semver)

affected

Credits

Nicholas Carlini from Anthropic finder

References

github.com/wolfSSL/wolfssl/pull/10116 patch

www.wolfssl.com/docs/security-vulnerabilities/

cve.org (CVE-2026-6681)

nvd.nist.gov (CVE-2026-6681)

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