undici vulnerable to cache poisoning and cross-user disclosure via cross-origin redirects

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

• CISA KEV Not listed.
• EPSS 0.0015, the 4th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 13:33 UTC First seen by agentprime
2. 31 Oct 2026, 13:33 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-4w7w-5xrc-9h26
• OSV: GHSA-4w7w-5xrc-9h26
• github.com/nodejs/undici/security/advisories/GHSA-4w7w-5xrc-9h26
• nvd.nist.gov/vuln/detail/CVE-2026-109829
• github.com/nodejs/undici/commit/26c2bfb3def0b67241ce878e80657ed5d6c3efa8
• github.com/nodejs/undici/commit/b20b82ad80a405a12b6ce1f341bcd418de390aa0
• cna.openjsf.org/security-advisories.html
• github.com/nodejs/undici
• github.com/nodejs/undici/releases/tag/v7.30.1
• github.com/nodejs/undici/releases/tag/v8.12.2

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.