Guzzle: Noncanonical cookie domain keeps subdomain scope

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 0.0020, the 9th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

1. 31 Oct 2026, 13:56 UTC First seen by agentprime
2. 31 Oct 2026, 13:56 UTC Confirmed by OSV

Sources

• GitHub Advisory Database: GHSA-f7vp-7xgx-4w4r
• OSV: GHSA-f7vp-7xgx-4w4r
• github.com/guzzle/guzzle/security/advisories/GHSA-f7vp-7xgx-4w4r
• github.com/guzzle/guzzle/pull/3907
• github.com/guzzle/guzzle/pull/3908
• github.com/guzzle/guzzle/commit/3aeea0406aab88cbbd86531313d7cebf8ae149a4
• github.com/guzzle/guzzle/commit/744101956d78b7c1384d0cbf379db13e859167bf
• github.com/guzzle/guzzle
• github.com/guzzle/guzzle/releases/tag/7.15.2
• github.com/guzzle/guzzle/releases/tag/8.0.1

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.