# Plug: multipart :length limit is not charged for part headers, enabling unbounded temp-file creation (denial of service)

Advisory record · `GHSA-95qv-c9g9-rm63`

- **Identifiers:** `GHSA-95qv-c9g9-rm63` · `CVE-2026-56814` · `EEF-CVE-2026-56814`
- **State:** Confirmed
- **Severity:** CVSS 6.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-770](https://cwe.mitre.org/data/definitions/770.html)
- **Tags:** [Denial of service](https://agentprime.io/advisories/tag/dos.md)
- **Published:** 10 Jul 2026
- **Updated:** 24 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 10 Jul 2026, 11:14 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `plug` (Hex): affected `>=1.4.0-rc.0, <1.16.6 || >=1.17.0, <1.17.4 || >=1.18.0, <1.18.5 || >=1.19.1, <1.19.5 || >=1.20.0, <1.20.3`; fixed in `1.16.6`, `1.17.4`, `1.18.5`, `1.19.5`, `1.20.3`

## 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

- 6.9 Medium, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N`, from CNA (EEF)

- **CISA KEV:** Not listed.
- **EPSS:** 0.011, the 65th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:25 UTC: First seen by agentprime
- 31 Oct 2026, 15:25 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/EEF-CVE-2026-56814)

## Sources

- [GitHub Advisory Database: GHSA-95qv-c9g9-rm63](https://github.com/advisories/GHSA-95qv-c9g9-rm63)
- [OSV: GHSA-95qv-c9g9-rm63](https://osv.dev/vulnerability/GHSA-95qv-c9g9-rm63)
- <https://github.com/elixir-plug/plug/security/advisories/GHSA-95qv-c9g9-rm63>
- <https://cna.erlef.org/cves/CVE-2026-56814.html>
- <https://github.com/elixir-plug/plug/commit/c52b2f32c90bccd718202bafccb5f95594e30183>
- <https://github.com/elixir-plug/plug/commit/981597d3a4271ede64373c7a731702a42c500dd6>
- <https://github.com/elixir-plug/plug/commit/56edca2ce35fe5589cd581644d8a4493fa5f484e>
- <https://github.com/elixir-plug/plug/commit/0ee8afcc61466dc5f7a8f048d0632c899165b81f>
- <https://github.com/elixir-plug/plug/commit/cae36053350e5215a4e0ca33cd130af9c5fc6364>
- <https://github.com/elixir-plug/plug/commit/f7effaed811c00b5f5bf817936bfd9c5df27b7dc>
- <https://github.com/elixir-plug/plug/commit/df97d3f17f808a9916a7700a701fb85314559d56>
- <https://hex.pm/packages/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-95qv-c9g9-rm63>, 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-95qv-c9g9-rm63/>. Everything for agents: <https://agentprime.io/llms.txt>.