# Arbitrary Code Execution in Cookie Serialization

Advisory record · `GHSA-5v4m-c73v-c7gq`

- **Identifiers:** `GHSA-5v4m-c73v-c7gq` · `CVE-2017-1000053`
- **State:** Confirmed
- **Severity:** CVSS 8.1 High
- **Critical:** No
- **Weakness (CWE):** [CWE-502](https://cwe.mitre.org/data/definitions/502.html)
- **Tags:** [Insecure deserialization](https://agentprime.io/advisories/tag/deserialization.md)
- **Published:** 12 Apr 2022
- **Updated:** 10 Dec 2025
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 12 Apr 2022, 21:23 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `plug` (Hex): affected `<1.0.4 || >=1.1.0, <1.1.7 || >=1.2.0, <1.2.3 || >=1.3.0, <1.3.2`; fixed in `1.0.4`, `1.1.7`, `1.2.3`, `1.3.2`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 8.1 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.019, the 80th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:26 UTC: First seen by agentprime
- 31 Oct 2026, 15:26 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-5v4m-c73v-c7gq)

## Sources

- [GitHub Advisory Database: GHSA-5v4m-c73v-c7gq](https://github.com/advisories/GHSA-5v4m-c73v-c7gq)
- [OSV: GHSA-5v4m-c73v-c7gq](https://osv.dev/vulnerability/GHSA-5v4m-c73v-c7gq)
- <https://nvd.nist.gov/vuln/detail/CVE-2017-1000053>
- <https://elixirforum.com/t/security-releases-for-plug/3913>
- <https://github.com/elixir-plug/plug>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-5v4m-c73v-c7gq>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-5v4m-c73v-c7gq/>. Everything for agents: <https://agentprime.io/llms.txt>.