---
title: "undici - Cache Poisoning & Information Disclosure"
description: "undici 7.0.0 to 7.30.0 and 8.0.0 to 8.12.1 contain a cache poisoning and information disclosure vulnerability caused by improper cache key handling after cross-origin redirects in originless Agent with shared cache, letting attackers poison cache or disclose private data, exploit requires use of originless Agent with shared cache and redirect-then-cache composition."
url: https://panop.io/threat-heartbeat/CVE-2026-109829/
---

# CVE-2026-109829 undici - Cache Poisoning & Information Disclosure

undici 7.0.0 to 7.30.0 and 8.0.0 to 8.12.1 contain a cache poisoning and information disclosure vulnerability caused by improper cache key handling after cross-origin redirects in originless Agent with shared cache, letting attackers poison cache or disclose private data, exploit requires use of originless Agent with shared cache and redirect-then-cache composition.

CVSS base score 7.4 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-109829)

## Details

Type

Misconfiguration

Impact

Information Disclosure, Data Tampering

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Published

15 October 2026

Updated

16 October 2026

Weakness

[CWE-346](https://cwe.mitre.org/data/definitions/346.html)

## Vendor fix

Upgrade to undici 7.30.1, 8.12.2 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-109829](https://nvd.nist.gov/vuln/detail/CVE-2026-109829)
- [https://cna.openjsf.org/security-advisories.html](https://cna.openjsf.org/security-advisories.html)
- [https://github.com/nodejs/undici/security/advisories/GHSA-4w7w-5xrc-9h26](https://github.com/nodejs/undici/security/advisories/GHSA-4w7w-5xrc-9h26)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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