PatchTheCVECVE-2026-5507: When restoring a session from cache, a pointer from the serialized session data is used in a free operation wi
CVE-2026-5507 is a medium-severity flaw (CVSS 4.0) affecting wolfssl. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 4.0 (Medium) |
| Attack vector | Local |
| Attack complexity | High |
| Privileges needed | High |
| User interaction | Required |
| EPSS exploit chance | 0.2% (top 93%) |
| CISA exploited list | No |
| Weakness | CWE-502 |
| Published | 2026-04-09 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-5507?
wolfssl: upgrade to newer than 5.9.0. Exact commands for each OS are on this page.
Is CVE-2026-5507 being exploited?
CVE-2026-5507 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-5507 affect?
CVE-2026-5507 affects wolfssl. Severity is medium (CVSS 4.0). 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
How urgent is CVE-2026-5507?
Priority 16/100. No elevated risk signals yet.
Software pages
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