🛡️ CVE-2026-5507 — wolfssl

🟡 CVSS 4.0 — Medium ✅ No Known Exploit CWE-502 NVD

4.0

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

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 to inject a crafted session into the cache and for the application to call specific session restore APIs.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is high, an attacker needs administrative privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Weakness class

CVE-2026-5507 is classified as CWE-502: Deserialization of Untrusted Data. Serialised data from an untrusted source is reconstructed into objects, which can trigger code during the process.

Affected software

CVE-2026-5507 is recorded against 1 package.

wolfssl (fixed in 5.9.0)

Timeline and source

Published on 9 April 2026 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

github.com

CVE-2026-5507 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Debian Ubuntu

Details

Severity MEDIUM

CVSS Score 4.0

CVSS Vector CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H

CWE CWE-502

Public Exploit ✅ No

Source NVD

Published 2026-04-09

Updated 2026-08-20

Modified 2026-06-17

Fix URL https://github.com/wolfSSL/wolfssl/pull/10088

Affected Packages

Software	From version	Fixed in
wolfssl	—	5.9.0

References

Issue Tracking, Patch https://github.com/wolfSSL/wolfssl/pull/10088

🔗 NVD 🔗 Mitre ✅ Fix / Advisory

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