Description
When parsing HTTP/1.x header values, Envoy 1.9.0 and before does not reject embedded zero characters (NUL, ASCII 0x0). This allows remote attackers crafting header values containing embedded NUL characters to potentially bypass header matching rules, gaining access to unauthorized resources.
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 0 | servicemesh-proxy | 0.9.1-1.el7 | RHSA-2019:0741 |
Advisories 1
- RHSA-2019:0741 Red Hat Security Advisory: Istio-Proxy Security Update Red Hat Security Advisories (RHSA) · Mar 18, 2026