Description
Heimdall is a cloud native Identity Aware Proxy and Access Control Decision service. Prior to version 0.17.17, when Heimdall operates in proxy mode, it constructs the Forwarded HTTP header after executing the matched rule pipeline by inserting the incoming request's Host header value directly into the header string without sanitizing commas or semicolons. This allows an attacker to inject additional parameters into the Forwarded header, potentially spoofing IP addresses for upstream services. This issue has been patched in version 0.17.17.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| dadrus | heimdall | < 0.17.17 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | heimdall | 2.2.2-1.1 | openSUSE-SU-2026:12397-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/dadrus/heimdall | < 0.17.17 | 0.17.17 | GHSA-4jgr-pg2m-m988 |
Advisories 1
- openSUSE-SU-2026:12397-1 heimdall-2.2.2-1.1 on GA media SUSE / openSUSE Security Updates · Nov 4, 2026