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CVE-2025-59936— get-jwks poisoned JWKS cache allows post-fetch issuer validation bypass

Quick assessment

Affected
nearform get-jwks
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.

get-jwks是Nearform开源的一个获取JWKS密钥的实用工具。 get-jwks 11.0.2之前版本存在安全漏洞，该漏洞源于JWKS密钥获取机制中的缓存投毒问题，可能导致绕过颁发者验证。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.40% · P33
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I. Basic Information for CVE-2025-59936

Vulnerability Information
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Vulnerability Title
get-jwks poisoned JWKS cache allows post-fetch issuer validation bypass
Source: CVE Program / CVE List V5
Vulnerability Description
get-jwks contains fetch utils for JWKS keys. In versions prior to 11.0.2, a vulnerability in get-jwks can lead to cache poisoning in the JWKS key-fetching mechanism. When the iss (issuer) claim is validated only after keys are retrieved from the cache, it is possible for cached keys from an unexpected issuer to be reused, resulting in a bypass of issuer validation. This design flaw enables a potential attack where a malicious actor crafts a pair of JWTs, the first one ensuring that a chosen public key is fetched and stored in the shared JWKS cache, and the second one leveraging that cached key to pass signature validation for a targeted iss value. The vulnerability will work only if the iss validation is done after the use of get-jwks for keys retrieval. This issue has been patched in version 11.0.2.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对输出编码和转义不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
get-jwks 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
get-jwks是Nearform开源的一个获取JWKS密钥的实用工具。 get-jwks 11.0.2之前版本存在安全漏洞，该漏洞源于JWKS密钥获取机制中的缓存投毒问题，可能导致绕过颁发者验证。
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

Vendor Product Affected Versions CPE Subscribe
nearform get-jwks < 11.0.2 -

II. Public POCs for CVE-2025-59936

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III. Intelligence Information for CVE-2025-59936

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IV. Related Vulnerabilities

Same vendor: nearform
Same weakness: CWE-116

V. Comments for CVE-2025-59936

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