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MEDIUM · 5.3

CVE-2026-6681

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 ...

Vulnerability 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.

CVSS Score

5.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
LOW
Availability
NONE

Affected Products

VendorProductVersions
WolfsslWolfssl>= 3.10.0, < 5.9.1

Related Weaknesses (CWE)

CWE-787CWE-120

References

FAQ

What is CVE-2026-6681?

CVE-2026-6681 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 ...

How severe is CVE-2026-6681?

CVE-2026-6681 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-6681?

Check the references section above for vendor advisories and patch information. Affected products include: Wolfssl Wolfssl.