What’s Vulnerable › Vulnerabilities

CVE-2026-6994: Envoy Query Parameter header_mutation.cc params.add injection

• Severity: medium (CVSS 6.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-25 · updated 2026-06-17
• Weakness: CWE-74

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

• Envoy: 1.0, 1.1, 1.2, 1.3, 1.4, 1.5 (+28)

References

• https://github.com/envoyproxy/envoy/commit/f8f4f1e02fdc64ecd4acf2d903208dd7285ad3a4
• https://github.com/envoyproxy/envoy/pull/43502/
• https://vuldb.com/submit/797241
• https://vuldb.com/vuln/359546
• https://vuldb.com/vuln/359546/cti

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