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CVE-2026-78426— Logout bypass via alternate JWT spelling

Quick assessment

Affected
go neuvector
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

NeuVector 的 JWT 验证器能够接受同一 RSA 签名字段的不同 Base64URL 编码形式（非规范编码）。因此，攻击者若持有一个尚未过期但已在 NeuVector 中登出的有效 JWT，只要该令牌的有效期尚未结束，就可以继续使用该令牌，而无需重新登录，因为验证器会接受其 RSA 签名字段的等效不同写法。

CVSS 3.7 · Low

Possible ATT&CK Techniques 1 AI

T1550.001 · Application Access Token
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I. Basic Information for CVE-2026-78426

Vulnerability Information
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Vulnerability Title
Logout bypass via alternate JWT spelling
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
go neuvector 0 ~ v5.6.1 -

II. Public POCs for CVE-2026-78426

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III. Intelligence Information for CVE-2026-78426

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Vendor Advisories for CVE-2026-78426 (1)

Vendor Pages for CVE-2026-78426 (1)

Same Patch Batch · go · 2026-09-17 · 4 CVEs total

CVE-2026-78428 8.0 HIGH Flaw in Nuevector can result in one user receiving another user's authenticated session wh
CVE-2026-78425 7.6 HIGH SAML Audience Confusion Allows Cross-SP Authentication
CVE-2026-78427 4.3 MEDIUM Admission Control Bypass via Hardcoded Sidecar Image Exemption

IV. Related Vulnerabilities

Same product: neuvector
Same vendor: go
Same weakness: CWE-863

V. Comments for CVE-2026-78426

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