Description
An issue was discovered in Envoy 1.12.0. An untrusted remote client may send an HTTP header (such as Host) with whitespace after the header content. Envoy will treat "header-value " as a different string from "header-value" so for example with the Host header "example.com " one could bypass "example.com" matchers.
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.
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Service Mesh 1 | kiali | v1.0.8.redhat1-1.el7 | RHSA-2019:4222 |
| Red Hat Service Mesh 1 | servicemesh +11 | 1.0.3-1.el8 | RHSA-2019:4222 |
| Red Hat Service Mesh 1 | servicemesh-grafana +1 | 6.2.2-25.el8 | RHSA-2019:4222 |
| Red Hat Service Mesh 1 | servicemesh-prometheus | 2.7.2-26.el8 | RHSA-2019:4222 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | nghttp2 | 1.40.0-3.6.3 | SUSE-SU-2020:0722-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | nghttp2 | 1.64.0-1.1 | openSUSE-SU-2024:14491-1 |
| openSUSE Leap 15.2 | nghttp2 +1 | 1.40.0-lp152.2.3.1 | openSUSE-SU-2021:0341-1 |
| openSUSE Leap 15.1 | nghttp2 +1 | 1.40.0-lp151.3.6.1 | openSUSE-SU-2020:0379-1 |
Advisories 5
- RHSA-2019:4222 Red Hat Security Advisory: Red Hat OpenShift Service Mesh 1.0.3 RPMs security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- openSUSE-SU-2024:14491-1 libnghttp2-14-1.64.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0379-1 Security update for nghttp2 SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0722-1 Security update for nghttp2 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2021:0341-1 Security update for nghttp2 SUSE / openSUSE Security Updates · Feb 4, 2026