---
title: "CVE-2013-10031\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2013-10031?format=md
keywords: index, follow
---

# CVE-2013-10031

Publication date 9 December 2025

Last updated 15 December 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**7.5 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2013-10031?format=md#impact-score)

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## Description

Plack-Middleware-Session versions before 0.17 may be vulnerable to HMAC
comparison timing attacks

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| libplack-middleware-session-perl | 26.04 LTS resolute | Not affected |
| 25.10 questing | Not affected |
| 25.04 plucky | Not affected |
| 24.04 LTS noble | Not affected |
| 22.04 LTS jammy | Not affected |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

7.5 · High

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | None |
  | Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 7.5 · High |
  | Exploitability score | - |
  | Impact score | - |

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

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2013-10031)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2013-10031)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2013-10031)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2013-10031)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2013-10031>
* <https://lists.security.metacpan.org/cve-announce/msg/35012183/>
* <https://github.com/plack/Plack-Middleware-Session/commit/b7f0252269ba1bb812b5dc02303754fe94c808e4>