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CVE-2026-54431— Improper Data Validation in liboauth2

Quick assessment

Affected
OpenIDC liboauth2
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.

OpenIDC liboauth2是OpenIDC公司的一个OAuth2协议实现库。 OpenIDC liboauth2 2.3.0之前版本存在处理逻辑错误漏洞，该漏洞源于DPoP验证器未按RFC 9449要求拒绝包含私钥的JSON Web Key标头，导致oauth2_token_verify函数错误接受嵌入了私密密钥的畸形DPoP证明。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenIDC liboauth2 < 2.3.0 affected
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I. Basic Information for CVE-2026-54431

Vulnerability Information
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Vulnerability Title
Improper Data Validation in liboauth2
Source: CVE Program / CVE List V5
Vulnerability Description
In liboauth2 the Demonstrating Proof-of-Possession (DPoP) verifier accepts a proof whose JSON Web Key (jwk) header contains private key material. RFC 9449 section 4.3 step 7 requires the verifier to reject such a proof but oauth2_token_verify() function returns success for a malformed DPoP proof that embeds the private Elliptic Curve (EC) key in the header. This issue was fixed in version 2.3.0
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不恰当实现的标准安全检查
Source: CVE Program / CVE List V5
Vulnerability Title
OpenIDC liboauth2 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenIDC liboauth2是OpenIDC公司的一个OAuth2协议实现库。 OpenIDC liboauth2 2.3.0之前版本存在处理逻辑错误漏洞，该漏洞源于DPoP验证器未按RFC 9449要求拒绝包含私钥的JSON Web Key标头，导致oauth2_token_verify函数错误接受嵌入了私密密钥的畸形DPoP证明。
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
OpenIDC liboauth2 0 ~ 2.3.0 -

II. Public POCs for CVE-2026-54431

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III. Intelligence Information for CVE-2026-54431

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Patches & Fixes for CVE-2026-54431 (1)

Security Blog Posts for CVE-2026-54431 (2)

IV. Related Vulnerabilities

Same product: liboauth2
Same vendor: OpenIDC
Same weakness: CWE-358

V. Comments for CVE-2026-54431

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