CVE-2025-62706— Authlib : JWE zip=DEF decompression bomb enables DoS
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I. Basic Information for CVE-2025-62706
Vulnerability Information
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Vulnerability Title
Authlib : JWE zip=DEF decompression bomb enables DoS
Source: NVD (National Vulnerability Database)
Vulnerability Description
Authlib is a Python library which builds OAuth and OpenID Connect servers. Prior to version 1.6.5, Authlib’s JWE zip=DEF path performs unbounded DEFLATE decompression. A very small ciphertext can expand into tens or hundreds of megabytes on decrypt, allowing an attacker who can supply decryptable tokens to exhaust memory and CPU and cause denial of service. This issue has been patched in version 1.6.5. Workarounds for this issue involve rejecting or stripping zip=DEF for inbound JWEs at the application boundary, forking and add a bounded decompression guard via decompressobj().decompress(data, MAX_SIZE)) and returning an error when output exceeds a safe limit, or enforcing strict maximum token sizes and fail fast on oversized inputs; combine with rate limiting.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Authlib 安全漏洞
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 1.6.5之前版本存在安全漏洞，该漏洞源于JWE zip=DEF路径执行无限制DEFLATE解压缩，可能导致内存和CPU耗尽，造成拒绝服务攻击。
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-2025-62706
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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-2026-28490
Authlib Vulnerable to JWE RSA1_5 Bleichenbacher Padding Orac - CVE-2026-27962
Authlib JWS JWK Header Injection: Signature Verification Byp - CVE-2026-28802
Authlib: Setting `alg: none` and a blank signature appears t
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-2026-28490
Authlib Vulnerable to JWE RSA1_5 Bleichenbacher Padding Orac - CVE-2026-27962
Authlib JWS JWK Header Injection: Signature Verification Byp - CVE-2026-28802
Authlib: Setting `alg: none` and a blank signature appears t
Same weakness: CWE-400
- CVE-2026-8187
Open5GS UPF gtp-path.c _gtpv1_u_recv_cb resource consumption - CVE-2026-42343
FastGPT: Uncontrolled Resource Consumption leading to Sandbo - CVE-2026-42212
SolidCAM-GPPL-IDE: XML External Entity (XXE) and billion-lau - CVE-2026-32686
Unbounded exponent in decimal enables unauthenticated DoS - CVE-2026-20188
Cisco Crosswork Network Controller and Cisco Network Service
V. Comments for CVE-2025-62706
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