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CVE-2026-54789— mod_auth_openidc has out-of-bounds read and write in state cookie parsing

Quick assessment

Affected
OpenIDC mod_auth_openidc
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

mod_auth_openidc 是适用于 Apache 2.x HTTP 服务器的已获 OpenID 认证的认证与授权模块，实现了 OpenID Connect 依赖方（Relying Party）功能。在版本 2.4.19.4 之前，其状态cookie（state-cookie）解析器中存在缓冲区外读（out-of-bounds read）以及一个字节长的缓冲区外写（one-byte out-of-bounds write）漏洞。该问题已在版本 2.4.19.4 中得到修复，修复方式为在遇到字符串终止符时停止扫

CVSS 7.5 · High EPSS 0.39% · P32

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
OpenIDC mod_auth_openidc < 2.4.19.4 affected
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I. Basic Information for CVE-2026-54789

Vulnerability Information
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Vulnerability Title
mod_auth_openidc has out-of-bounds read and write in state cookie parsing
Source: CVE Program / CVE List V5
Vulnerability Description
mod_auth_openidc is an OpenID Certified authentication and authorization module for the Apache 2.x HTTP server that implements the OpenID Connect Relying Party functionality. Prior to 2.4.19.4, an out-of-bounds read and a one-byte out-of-bounds write exist in the state-cookie parser of `mod_auth_openidc`. The issue is fixed in version 2.4.19.4 by stopping the scan at the string terminator so a value-less token is rejected. No in-product workarounds are available. As a stop-gap, an upstream reverse proxy or WAF that rejects or normalizes malformed `Cookie` headers (tokens lacking `=`) can reduce exposure, but upgrading is the recommended remediation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenIDC mod_auth_openidc < 2.4.19.4 -

II. Public POCs for CVE-2026-54789

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7057 chars
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III. Intelligence Information for CVE-2026-54789

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Patches & Fixes for CVE-2026-54789 (1)

Vendor Advisories for CVE-2026-54789 (1)

IV. Related Vulnerabilities

Same product: mod_auth_openidc
Same vendor: OpenIDC
Same weakness: CWE-125

V. Comments for CVE-2026-54789

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