CVE-2026-28490— Authlib Vulnerable to JWE RSA1_5 Bleichenbacher Padding Oracle
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I. Basic Information for CVE-2026-28490
Vulnerability Information
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Vulnerability Title
Authlib Vulnerable to JWE RSA1_5 Bleichenbacher Padding Oracle
Source: NVD (National Vulnerability Database)
Vulnerability Description
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.9, a cryptographic padding oracle vulnerability was identified in the Authlib Python library concerning the implementation of the JSON Web Encryption (JWE) RSA1_5 key management algorithm. Authlib registers RSA1_5 in its default algorithm registry without requiring explicit opt-in, and actively destroys the constant-time Bleichenbacher mitigation that the underlying cryptography library implements correctly. This issue has been patched in version 1.6.9.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过差异性导致的信息暴露
Source: NVD (National Vulnerability Database)
Vulnerability Title
Authlib 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Authlib是Authlib开源的一个构建 OAuth 和 OpenID Connect 服务器的终极 Python 库。 Authlib 1.6.9之前版本存在加密问题漏洞，该漏洞源于JSON Web Encryption RSA1_5密钥管理算法实现存在加密填充预言机漏洞，可能破坏底层密码库的恒定时间缓解措施。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2026-28490
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- Release v1.6.9 · authlib/authlib · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-28490
Same Patch Batch · authlib · 2026-03-16 · 3 CVEs total
| CVE-2026-27962 | 9.1 CRITICAL | Authlib JWS JWK Header Injection: Signature Verification Bypass |
| CVE-2026-28498 | Authlib: Fail-Open Cryptographic Verification in OIDC Hash Binding |
IV. Related Vulnerabilities
Same product: authlib
- CVE-2026-41425
Authlib: Cross-site request forging when using cache - CVE-2026-28498
Authlib: Fail-Open Cryptographic Verification in OIDC Hash B - CVE-2026-27962
Authlib JWS JWK Header Injection: Signature Verification Byp - CVE-2026-28802
Authlib: Setting `alg: none` and a blank signature appears t - CVE-2025-68158
Authlib: 1-click Account Takeover
Same vendor: authlib
- CVE-2026-41425
Authlib: Cross-site request forging when using cache - CVE-2026-28498
Authlib: Fail-Open Cryptographic Verification in OIDC Hash B - CVE-2026-27962
Authlib JWS JWK Header Injection: Signature Verification Byp - CVE-2026-28802
Authlib: Setting `alg: none` and a blank signature appears t - CVE-2026-27932
joserfc PBES2 p2c Unbounded Iteration Count enables Denial o
Same weakness: CWE-203
- CVE-2026-44263
Weblate: Private Translation Enumeration via Screenshot API - CVE-2023-5872
Wago: Vulnerability in Smart Designer Web-Application - CVE-2026-33429
Parse Server: Protected field change detection oracle via Li - CVE-2026-33425
Discourse has inferable private group membership or existenc - CVE-2026-3580
Compiler-induced timing leak in sp_256_get_entry_256_9 on RI
V. Comments for CVE-2026-28490
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