follow-redirects: Cross-realm sensitiveHeaders arrays are discarded and custom credentials can follow 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 0.0027, the 18th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 13:32 UTC First seen by agentprime
2. 31 Oct 2026, 13:32 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-mrwp-f3q8-3g9p
• OSV: GHSA-mrwp-f3q8-3g9p
• github.com/follow-redirects/follow-redirects/security/advisories/GHSA-mrwp-f3q8-3g9p
• nvd.nist.gov/vuln/detail/CVE-2026-116689
• github.com/follow-redirects/follow-redirects/commit/b0a7751e9cd64cd8eeb6ec67d2f206a9cc88d3f8
• github.com/follow-redirects/follow-redirects
• github.com/follow-redirects/follow-redirects/releases/tag/v1.16.2

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.