# body-parser vulnerable to denial of service when invalid limit value silently disables size enforcement

Advisory record · `GHSA-v422-hmwv-36x6`

- **Identifiers:** `GHSA-v422-hmwv-36x6` · `CVE-2026-12590`
- **State:** Confirmed
- **Severity:** CVSS 3.7 Low
- **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:** 20 Jul 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 20 Jul 2026, 23:23 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `body-parser` (npm): affected `<1.20.6 || >=2.0.0, <2.3.0`; fixed in `1.20.6`, `2.3.0`

## 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

- 3.7 Low, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L`, from CNA (openjs)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0041, the 36th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 9 Jul 2026, 10:16 UTC: [Published by the maintainers as a GitHub repository advisory](https://github.com/expressjs/body-parser/security/advisories/GHSA-v422-hmwv-36x6)

## Sources

- [GitHub Advisory Database: GHSA-v422-hmwv-36x6](https://github.com/advisories/GHSA-v422-hmwv-36x6)
- [OSV: GHSA-v422-hmwv-36x6](https://osv.dev/vulnerability/GHSA-v422-hmwv-36x6)
- <https://github.com/expressjs/body-parser/security/advisories/GHSA-v422-hmwv-36x6>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-12590>
- <https://github.com/expressjs/body-parser/pull/698>
- <https://github.com/expressjs/body-parser/pull/741>
- <https://github.com/expressjs/body-parser/commit/2322e111cc321413ec2b7b76d01be533d3de9d7d>
- <https://github.com/expressjs/body-parser/commit/3492672eee593d5c158f239b6e9115498a5dbeac>
- <https://cna.openjsf.org/security-advisories.html>
- <https://github.com/expressjs/body-parser>
- <https://github.com/expressjs/body-parser/releases/tag/1.20.6>
- <https://github.com/expressjs/body-parser/releases/tag/v2.3.0>

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-v422-hmwv-36x6>, 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-v422-hmwv-36x6/>. Everything for agents: <https://agentprime.io/llms.txt>.