GHSA-9623-mqmm-5rcf: io.undertow:undertow-core (CVE-2024-7885)

Package	Ecosystem	Affected	Fixed in
io.undertow:undertow-core	Maven	<2.2.36.Final \|\| >=2.3.0.Alpha1, <2.3.17.Final	2.2.36.Final, 2.3.17.Final

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Undertow (io.undertow:undertow-core) versions before 2.2.36.Final, and from 2.3.0.Alpha1 before 2.3.17.Final, are affected. A race condition in the PROXY protocol v1 parsing reuses a shared StringBuilder across requests on the same connection, which can cause a value from one request to be reused in another and may expose data between them. The source gives few details on the exact conditions required to trigger it. Upgrade to 2.2.36.Final or 2.3.17.Final, or later.

Written 7 Nov 2026.

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

Score	Rating	CVSS	Vector	Source
7.5	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CNA (redhat)

CISA KEV Not listed.
EPSS 0.026, the 85th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

21 Aug 2024, 14:13 UTC Confirmed by the CVE List
21 Aug 2024, 14:15 UTC Confirmed by NVD
31 Oct 2026, 15:09 UTC First seen by agentprime
31 Oct 2026, 15:09 UTC Confirmed by OSV

Sources

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.