# CVE-2026-6994

## Summary

- **CVE ID:** CVE-2026-6994
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (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)
- **CWE:** CWE-74, CWE-707
- **Published:** Apr 25, 2026
- **Last Modified:** Apr 27, 2026

## 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 Products

- n/a — Envoy (1.0)
- n/a — Envoy (1.1)
- n/a — Envoy (1.2)
- n/a — Envoy (1.3)
- n/a — Envoy (1.4)
- n/a — Envoy (1.5)
- n/a — Envoy (1.6)
- n/a — Envoy (1.7)
- n/a — Envoy (1.8)
- n/a — Envoy (1.9)
- n/a — Envoy (1.10)
- n/a — Envoy (1.11)
- n/a — Envoy (1.12)
- n/a — Envoy (1.13)
- n/a — Envoy (1.14)
- n/a — Envoy (1.15)
- n/a — Envoy (1.16)
- n/a — Envoy (1.17)
- n/a — Envoy (1.18)
- n/a — Envoy (1.19)
- n/a — Envoy (1.20)
- n/a — Envoy (1.21)
- n/a — Envoy (1.22)
- n/a — Envoy (1.23)
- n/a — Envoy (1.24)
- n/a — Envoy (1.25)
- n/a — Envoy (1.26)
- n/a — Envoy (1.27)
- n/a — Envoy (1.28)
- n/a — Envoy (1.29)
- n/a — Envoy (1.30)
- n/a — Envoy (1.31)
- n/a — Envoy (1.32)
- n/a — Envoy (1.33.0)

## References

- [CNA](https://vuldb.com/vuln/359546)
- [CNA](https://vuldb.com/vuln/359546/cti)
- [CNA](https://vuldb.com/submit/797241)
- [CNA](https://github.com/envoyproxy/envoy/pull/43502/)
- [CNA](https://github.com/envoyproxy/envoy/commit/f8f4f1e02fdc64ecd4acf2d903208dd7285ad3a4)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.23%
- **EPSS Percentile:** 13.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._