RLSA-2023:6940: Moderate: mod_auth_openidc:2.3 security and bug fix update

Q: Which systems are potentially affected?

Apache HTTP Server deployments using mod_auth_openidc as an OpenID Connect Relying Party or OAuth 2.0 Resource Server are in scope.

Q: What does an attacker need to trigger the denial-of-service issue?

The NULL pointer dereference is triggered when OIDCStripCookies is enabled and an attacker supplies a crafted Cookie header. The advisory rates availability impact as high.

Q: What is the redirect-related issue?

The update fixes an open redirect in oidc_validate_redirect_url() involving use of a tab character.

Published Nov 5, 2026

Updated

The modauthopenidc is an OpenID Connect authentication module for Apache HTTP Server. It enables an Apache HTTP Server to operate as an OpenID Connect Relying Party and/or OAuth 2.0 Resource Server.

Security Fix(es):

modauthopenidc: Open Redirect in oidcvalidateredirecturl() using tab character (CVE-2022-23527)

modauthopenidc: NULL pointer dereference when OIDCStripCookies is set and a crafted Cookie header is supplied (CVE-2023-28625)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Rocky Linux 8.9 Release Notes linked from the References section.

Affected Software

2 affected componentsFixes available

rocky-linux/cjose<0:0.6.1-4.module+el8.9.0+1384+4b58c166

0:0.6.1-4.module+el8.9.0+1384+4b58c166

rocky-linux/mod_auth_openidc<0:2.4.9.4-5.module+el8.9.0+1384+4b58c166

0:2.4.9.4-5.module+el8.9.0+1384+4b58c166

Remediation

Recommended actions to resolve this vulnerability, in priority order.

Upgrade
Upgrade rocky-linux/cjose to a version that resolves this vulnerability.
Fixed in 0:0.6.1-4.module+el8.9.0+1384+4b58c166
Upgrade
Upgrade rocky-linux/mod_auth_openidc to a version that resolves this vulnerability.
Fixed in 0:2.4.9.4-5.module+el8.9.0+1384+4b58c166

Event History

Nov 5, 2026

Advisory Published

via OSV·12:01 PM

Data Sourced

via OSV·12:01 PM

DescriptionSeverityAffected Software

Child vulnerabilities

Contains the following vulnerabilities.

Frequently Asked Questions

Which systems are potentially affected?

Apache HTTP Server deployments using mod_auth_openidc as an OpenID Connect Relying Party or OAuth 2.0 Resource Server are in scope.

What does an attacker need to trigger the denial-of-service issue?

The NULL pointer dereference is triggered when OIDCStripCookies is enabled and an attacker supplies a crafted Cookie header. The advisory rates availability impact as high.

What is the redirect-related issue?

The update fixes an open redirect in oidc_validate_redirect_url() involving use of a tab character.

RLSA-2023:6940: Moderate: mod_auth_openidc:2.3 security and bug fix update

Affected Software

Remediation

Event History

Child vulnerabilities

Frequently Asked Questions

Which systems are potentially affected?

What does an attacker need to trigger the denial-of-service issue?

What is the redirect-related issue?

Company

Resources

Contact

Frequently Asked Questions

Which systems are potentially affected?

What does an attacker need to trigger the denial-of-service issue?

What is the redirect-related issue?