GHSA-g4qm-m288-5cp9: github.com/corazawaf/coraza/v3 (CVE-2026-107835)

Package	Ecosystem	Affected	Fixed in
github.com/corazawaf/coraza/v3	Go	<3.8.1	3.8.1

Machine-written summary

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

Coraza (github.com/corazawaf/coraza/v3) versions before 3.8.1 are vulnerable, because its cookie parser does not strip control characters adjacent to the "=" separator, so it can index a different cookie name or value than the backend application does. An attacker who can send a crafted Cookie header can use this mismatch to evade SecRule checks scoped to specific cookies, which hides cookie-carried attacks from inspection. Upgrade to version 3.8.1, which is listed as the fixed version.

Written 1 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
4.0	Medium	3.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0030, the 22nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 14:11 UTC First seen by agentprime
31 Oct 2026, 14:11 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.