# CVE-2014-125112: Plack::Middleware::Session::Cookie versions through 0.21 for Perl allows remote code execution

> Attackers can execute arbitrary code on servers using Plack::Middleware::Session::Cookie if the cookie signing secret is not configured.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 26 Mar 2026
- **Updated:** 26 Mar 2026
- **Also known as:** DEBIAN-CVE-2014-125112, GHSA-58qr-v987-vh6w, UBUNTU-CVE-2014-125112

## What is CVE-2014-125112?

CVE-2014-125112 is a critical unsafe deserialization vulnerability in MIYAGAWA Plack::Middleware::Session::Cookie, published on 26 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Plack::Middleware::Session::Cookie versions through 0.21 for Perl allows remote code execution.

Plack::Middleware::Session::Cookie versions through 0.21 has a security vulnerability where it allows an attacker to execute arbitrary code on the server during deserialization of the cookie data, when there is no secret used to sign the cookie.

Weakness: CWE-565 (Reliance on Cookies without Validation and Integrity Checking)

## Which versions are affected by CVE-2014-125112?

It affects 1 product.


Products: Miyagawa Plack\.

## How do I fix CVE-2014-125112?

Apply the vendor's patch.

## Is CVE-2014-125112 being exploited?

There is no known exploitation of CVE-2014-125112 in the wild and no public exploit code.

## Other vulnerabilities in MIYAGAWA Plack::Middleware::Session::Cookie

- [CVE-2026-7381](https://insights.sbomify.com/CVE-2026-7381/): Plack::Middleware::XSendfile versions through 1.0053 for Perl can allow client-controlled path rewriting (critical 9.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2014-125112 and fix it if it is affected.

What it is: CVE-2014-125112 is a critical unsafe deserialization vulnerability in MIYAGAWA Plack::Middleware::Session::Cookie, published on 26 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2014-125112 in the wild and no public exploit code.

Affected product: MIYAGAWA Plack::Middleware::Session::Cookie. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2014-125112/ (Markdown: https://insights.sbomify.com/CVE-2014-125112/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2014-125112
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2014-125112
- OSV: https://osv.dev/vulnerability/CVE-2014-125112

---
From sbomify Insights: https://insights.sbomify.com/CVE-2014-125112/
Summaries are generated and may contain mistakes; the official description above is the record.