NeuVector JWT verifier accepts noncanonical Base64URL signatures (v5.6.1)
CVE-2026-78426 Published on September 17, 2026
Logout bypass via alternate JWT spelling
The NeuVector JWT verifier accepts noncanonical Base64URL encodings of the same RSA signature field. An attacker holding a valid JWT that has not expired, but was logged out of NeuVector, can continue using the non-expired token with equivalent spelling of the RSA signature field until the token validity expires.
Vulnerability Analysis
CVE-2026-78426 is exploitable with network access, requires user interaction and a small amount of user privileges. This vulnerability is consided to have a high level of attack complexity. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is an AuthZ Vulnerability?
The software performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.
CVE-2026-78426 has been classified to as an AuthZ vulnerability or weakness.
Products Associated with CVE-2026-78426
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Affected Versions
go neuvector:- Before and including v5.6.1 is affected.