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CVE-2026-6994

Envoy Query Parameter header_mutation.cc params.add injection

MEDIUM
6.3
CVSS Score
Published: April 25, 2026 at 07:00 PM UTC
Updated: June 17, 2026 at 11:01 AM UTC
1 product affected across 1 vendorEnvoy

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Severity
MEDIUM6.3
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

Patch
Source: [email protected]
https://github.com/envoyproxy/envoy/commit/f8f4f1e02fdc64ecd4acf2d903208dd7285ad3a4
Issue TrackingPatch
Source: [email protected]
https://github.com/envoyproxy/envoy/pull/43502/
Third Party Advisory
Source: [email protected]
https://vuldb.com/submit/797241
VDB EntryTechnical Description
Source: [email protected]
https://vuldb.com/vuln/359546
SignaturePermissions Required
Source: [email protected]
https://vuldb.com/vuln/359546/cti

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.3MEDIUMVulDB
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-74CWE-707

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