CVE-2026-6681

PKCS#7 decode ignores caller output buffer size, writing past buffer bounds

State: Published
Severity: 1.0 Low
Published: Jun 25, 2026
Updated: Jun 26, 2026
Reserved: Apr 20, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	1.0 Low	CVSS: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	wolfSSL

Weaknesses

CWE-787 Out-of-bounds Write
CWE-120 Buffer Copy without Checking Size of Input

Affected Products

Product	Versions
wolfSSLwolfSSL	3.10.0 through 5.9.0Affected

References

https://github.com/wolfSSL/wolfssl/pull/10116patch
https://www.wolfssl.com/docs/security-vulnerabilities/

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