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. 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 no impact on confidentiality and integrity and 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
SUSE neuvector:- Before and including v5.6.1 is affected.