PatchTheCVECVE-2013-10031: Plack-Middleware-Session versions before 0.17 may be vulnerable to HMAC comparison timing attacks
CVE-2013-10031 is a high-severity flaw (CVSS 7.5) affecting plack-middleware-session. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Plack-Middleware-Session versions before 0.17 may be vulnerable to HMAC comparison timing attacks
Why this priority
- High severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 7.5 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.3% (top 78%) |
| CISA exploited list | No |
| Weakness | CWE-1254 |
| Published | 2025-12-09 |
| Last modified | 2026-06-16 |
Last updated 2026-06-16 · 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-2013-10031?
plack-middleware-session: upgrade to 0.17. Exact commands for each OS are on this page.
Is CVE-2013-10031 being exploited?
CVE-2013-10031 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-2013-10031 affect?
CVE-2013-10031 affects plack-middleware-session. Severity is high (CVSS 7.5). Plack-Middleware-Session versions before 0.17 may be vulnerable to HMAC comparison timing attacks
How urgent is CVE-2013-10031?
Priority 37/100. High severity; Remotely exploitable, no login, no user action