# undici vulnerable to cookie attribute injection via unsanitized domain and unparsed setCookie fields

Advisory record · `GHSA-v3r7-h72x-cjcm`

- **Identifiers:** `GHSA-v3r7-h72x-cjcm` · `CVE-2026-16729`
- **State:** Confirmed
- **Severity:** CVSS 4.8 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-74](https://cwe.mitre.org/data/definitions/74.html)
- **Tags:** [Other injection](https://agentprime.io/advisories/tag/injection.md)
- **Published:** 3 Aug 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 3 Aug 2026, 19:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `undici` (npm): affected `<6.28.0 || >=7.0.0, <7.29.0 || >=8.0.0, <8.9.0`; fixed in `6.28.0`, `7.29.0`, `8.9.0`

## 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0028, the 20th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 29 Jul 2026, 14:18 UTC: [Published by the maintainers as a GitHub repository advisory](https://github.com/nodejs/undici/security/advisories/GHSA-v3r7-h72x-cjcm)

## Sources

- [GitHub Advisory Database: GHSA-v3r7-h72x-cjcm](https://github.com/advisories/GHSA-v3r7-h72x-cjcm)
- [OSV: GHSA-v3r7-h72x-cjcm](https://osv.dev/vulnerability/GHSA-v3r7-h72x-cjcm)
- <https://github.com/nodejs/undici/security/advisories/GHSA-v3r7-h72x-cjcm>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-16729>
- <https://github.com/nodejs/undici/commit/10d93fc332f2c8c161982dec3833201de29891b5>
- <https://github.com/nodejs/undici/commit/3bf91ddb493e853957f3a58e155326a668ab8aef>
- <https://github.com/nodejs/undici/commit/af7484043ee075a6f216da0ad77e1dac55199235>
- <https://cna.openjsf.org/security-advisories.html>
- <https://github.com/nodejs/undici>
- <https://github.com/nodejs/undici/releases/tag/v6.28.0>
- <https://github.com/nodejs/undici/releases/tag/v7.29.0>
- <https://github.com/nodejs/undici/releases/tag/v8.9.0>

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-v3r7-h72x-cjcm>, 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-v3r7-h72x-cjcm/>. Everything for agents: <https://agentprime.io/llms.txt>.