{"apiVersion":"1.0","identifier":"CVE-2026-54789","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.","publishedAt":"2026-08-21T16:17:19","lastModifiedAt":"2026-08-21T18:16:48","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-54789","cvssScore":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","epssProbability":0.00394,"riskScore":0.78,"affectedProduct":"mod_auth_openidc","affectedVersions":"<2.4.19.4","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-54789","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-54789","en":"https://www.redsauce.net/en/cves/CVE-2026-54789","fr":"https://www.redsauce.net/fr/cves/CVE-2026-54789","pt":"https://www.redsauce.net/pt/cves/CVE-2026-54789","de":"https://www.redsauce.net/de/cves/CVE-2026-54789","sk":"https://www.redsauce.net/sk/cves/CVE-2026-54789","el":"https://www.redsauce.net/el/cves/CVE-2026-54789"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-54789"}}