CVE-2026-107492
What it is
Improper Authentication in the jwt_authn HTTP filter in envoyproxy envoy versions up to and including 1.38.0 allows an unauthenticated attacker to bypass JWT requirements by sending a duplicate trigger header. When a JWT requirement is scoped to a specific header, supplying that header twice with any second value causes the requirement to silently not apply, allowing the request to reach the upstream backend without any token check.
At a glance
- Exploitability
- Can be exploited over the network without logging in. High risk of data exposure, data tampering, service disruption.
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- ReservedThe CVE id was reserved by its CNA
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: not scored yet.
- Severity: 10.0 CRITICAL (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Weakness
- CWE-287 · Improper authentication
- Record status
- Received
Affected
- Envoyproxy Envoy ≤ 1.38.0
Attack profile CVSS 4.0 · 10.0
- Attack vector
- Network
- Complexity
- Low
- Attack requirements
- None
- Privileges needed
- None
- User interaction
- None
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Raw vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2026-107492.md and follow it. Check whether this project is affected by CVE-2026-107492. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
