Improper Neutralization of HTTP Headers for Scripting Syntax Affecting rhceph/oauth2-proxy-rhel9 package, versions *


Severity

Recommended
0.0
high
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.62% (47th percentile)

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  • Snyk IDSNYK-RHEL8-RHCEPHOAUTH2PROXYRHEL9-13903464
  • published12 Nov 2025
  • disclosed10 Nov 2025

Introduced: 10 Nov 2025

CVE-2025-64484  (opens in a new tab)
CWE-644  (opens in a new tab)

How to fix?

There is no fixed version for RHEL:8 rhceph/oauth2-proxy-rhel9.

NVD Description

Note: Versions mentioned in the description apply only to the upstream rhceph/oauth2-proxy-rhel9 package and not the rhceph/oauth2-proxy-rhel9 package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

OAuth2-Proxy is an open-source tool that can act as either a standalone reverse proxy or a middleware component integrated into existing reverse proxy or load balancer setups. In versions prior to 7.13.0, all deployments of OAuth2 Proxy in front of applications that normalize underscores to dashes in HTTP headers (e.g., WSGI-based frameworks such as Django, Flask, FastAPI, and PHP applications). Authenticated users can inject underscore variants of X-Forwarded-* headers that bypass the proxy’s filtering logic, potentially escalating privileges in the upstream app. OAuth2 Proxy authentication/authorization itself is not compromised. The problem has been patched with v7.13.0. By default all specified headers will now be normalized, meaning that both capitalization and the use of underscores (_) versus dashes (-) will be ignored when matching headers to be stripped. For example, both X-Forwarded-For and X_Forwarded-for will now be treated as equivalent and stripped away. For those who have a rational that requires keeping a similar looking header and not stripping it, the maintainers introduced a new configuration field for Headers managed through the AlphaConfig called InsecureSkipHeaderNormalization. As a workaround, ensure filtering and processing logic in upstream services don't treat underscores and hyphens in Headers the same way.

CVSS Base Scores

version 3.1