PT-2026-35167 · Envoy · Envoy

Lukefr09 · Published 2026-04-25 · Updated 2026-04-25 · CVE-2026-6994

Positive Technologies (AI Summary)

CVSS v2.0

6.5

Medium

Base vector

AV:N/AC:L/Au:S/C:P/I:P/A:P

Name of the Vulnerable Software and Affected Versions Envoy versions prior to 1.33.0

Description A weakness in the Query Parameter Handler component allows for injection. The issue resides in the params.add() function within the source/extensions/filters/http/header mutation/header mutation.cc file, which can be exploited remotely.

Recommendations Install the patch f8f4f1e02fdc64ecd4acf2d903208dd7285ad3a4. As a temporary workaround, restrict the use of the params.add() function in the header mutation filter.

Fix

Improper Neutralization

Special Elements Injection

Weakness Enumeration

CWE-707

CWE-74

Related Identifiers

CVE-2026-6994

Affected Products

Envoy

References · 8

• https://github.com/envoyproxy/envoy/commit/f8f4f1e02fdc64ecd4acf2d903208dd7285ad3a4 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-6994 · Security Note
• https://github.com/envoyproxy/envoy/pull/43502 · Patch
• https://twitter.com/VulmonFeeds/status/2048125682845102312 · Twitter Post
• https://vuldb.com/vuln/359546/cti · Note
• https://twitter.com/CVEnew/status/2048168330641760398 · Twitter Post
• https://vuldb.com/vuln/359546 · Note
• https://vuldb.com/submit/797241 · Note