CVE-2026-5507 PUBLISHED

Session Cache Restore — Arbitrary Free via Deserialized Pointer

Assigner: wolfSSL
Reserved: 03.04.2026 Published: 09.04.2026 Updated: 09.04.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 4.1

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Local	Confidentiality	None	Confidentiality	None
Attack Complexity	High	Integrity	None	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	High
User Interaction	Passive

CVSS 4.0

Product Status

Vendor	wolfSSL
Product	wolfSSL
Versions	Default: unaffected affected from 0 to 5.9.0 (incl.)

Credits

Sunwoo Lee (Korea Institute of Energy Technology, KENTECH) finder
Woohyun Choi (Korea Institute of Energy Technology, KENTECH) finder
Seunghyun Yoon (Korea Institute of Energy Technology, KENTECH) finder

References

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

Problem Types

CWE-502 Deserialization of untrusted data CWE