What is CVE-2026-5507?

CVE-2026-5507 is a medium-severity vulnerability in Wolfssl, classified under Deserialization of Untrusted Data. CVSS score: 4.0/10. Published 2026-04-09.

How severe is CVE-2026-5507?

Medium severity. CVSS v3 base score is 4.0 out of 10.

Deserialization in Wolfssl

CVE-2026-5507

When restoring a session from cache, a pointer from the serialized session data is used in a free operation without validation. An attacker who can poison the session cache could trigger an arbitrary free. Exploitation requires the ability…

Vulnerability class: Insecure Deserialization

EPSS: 0.000 (3.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H.

Affected products

Wolfssl — versions 0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

facts@wolfssl.com (Patch, Issue Tracking)

Frequently asked questions

What is CVE-2026-5507?: CVE-2026-5507 is a medium-severity vulnerability in Wolfssl, classified under Deserialization of Untrusted Data. CVSS score: 4.0/10. Published 2026-04-09.
How severe is CVE-2026-5507?: Medium severity. CVSS v3 base score is 4.0 out of 10.