CVE-2026-6994CWE-707CWE-74

Envoy Query Parameter header_mutation.cc params.add injection

Medium · published April 25, 2026

CVSS v4.0
5.3
EPSS
0%
Percentile
32.2
In the wild
Unconfirmed
What it is

A weakness has been identified in Envoy up to 1.33.0. Affected is the function params.add of the file source/extensions/filters/http/header_mutation/header_mutation.cc of the component Query Parameter Handler. This manipulation causes injection. Remote exploitation of the attack is possible. Patch name: f8f4f1e02fdc64ecd4acf2d903208dd7285ad3a4. It is suggested to install a patch to address this issue.

The record
Technical detail
CVSS v4.0
5.3 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X
EPSS
0.00393 · 32.2th percentile
Weaknesses
CWE-707 · Improper Neutralization; CWE-74 · Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')
Published
2026-04-25T19:00Z
EPSS history
Timeline
  • 25 APR 19:00Z
    Envoy Query Parameter header_mutation.cc params.add injection
    cvelistv5