GHSA-r8x2-fhmf-6mxp: github.com/dadrus/heimdall (CVE-2026-32811)

Package	Ecosystem	Affected	Fixed in
github.com/dadrus/heimdall	Go	>=0.7.0-alpha, <0.17.11	0.17.11

Machine-written summary

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

Heimdall versions from 0.7.0-alpha before 0.17.11 are affected when used with the Envoy gRPC decision API. Path rules without wildcards can be bypassed by adding a query string to the request, because the query is mangled into the path and no longer matches the rule. This only leads to unintended access when heimdall uses an allow-all default rule, which heimdall 0.16.0 and later refuse to start with unless enforcement is explicitly disabled. Upgrade to heimdall 0.17.11.

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
8.2	High	3.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:N	CNA (GitHub_M)

CISA KEV Not listed.
EPSS 0.0032, the 25th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

31 Oct 2026, 15:08 UTC First seen by agentprime
31 Oct 2026, 15:08 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.