Improper Input Validation

OAuth2-Proxy is vulnerable to improper input validation. The vulnerability is due to inconsistent normalization of underscores and dashes in X-Forwarded- headers, which allows an attacker to inject crafted header variants to bypass proxy filtering and potentially escalate privileges in upstream...

OAuth2-Proxy is vulnerable to header smuggling via underscore leading to potential privilege escalation

Impact 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...

EUVD-2025-50825

OAuth2-Proxy is vulnerable to header smuggling via underscore leading to potential privilege escalation...

CVE-2025-64484

A header-smuggling vulnerability was found in OAuth2-Proxy’s handling of HTTP headers containing underscores such as XForwardedFor. The proxy failed to properly normalize these header names, which could allow crafted requests to bypass header validation or filtering. When OAuth2-Proxy is deployed...

BIT-OAUTH2-PROXY-2025-64484 OAuth2-Proxy vulnerable to header smuggling via underscore, leading to potential privilege escalation

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 dashe...

CVE-2025-64484

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 dashe...

CVE-2025-64484

OAuth2-Proxy is affected by a header smuggling vulnerability where authenticated users can exploit underscores in HTTP header names (e.g., X_Forwarded_For) to bypass upstream header filtering, potentially escalating privileges in the application behind the proxy. The issue occurs in deployments t...

CVE-2025-64484: Improper Neutralization of HTTP Headers for Scripting Syntax

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 dashe...

PT-2025-46204

Name of the Vulnerable Software and Affected Versions OAuth2-Proxy versions prior to 7.13.0 Description OAuth2-Proxy is susceptible to a header smuggling issue. In deployments positioned before applications that normalize underscores to dashes in HTTP headers like WSGI-based frameworks such as...

Security update for rubygem-puma

This update for rubygem-puma fixes the following issues: Update to version 5.6.9. CVE-2024-45614: improper header normalization allows for clients to clobber proxy set headers, which can lead to information leaks bsc1230848, fixed in an earlier update. CVE-2024-21647: unbounded resource consumpti...

webob: WebOb's location header normalization during redirect leads to open redirect

A vulnerability was found in the WebOb package. WebOb normalizes the HTTP Location header using urlparse and urljoin. If the URL starts with //, urlparse treats the following part as the hostname, and replaces the original request's hostname. This issue, combined with user interaction, may become...

webob: WebOb's location header normalization during redirect leads to open redirect

A vulnerability was found in the WebOb package. WebOb normalizes the HTTP Location header using urlparse and urljoin. If the URL starts with //, urlparse treats the following part as the hostname, and replaces the original request's hostname. This issue, combined with user interaction, may become...

webob: WebOb's location header normalization during redirect leads to open redirect

A vulnerability was found in the WebOb package. WebOb normalizes the HTTP Location header using urlparse and urljoin. If the URL starts with //, urlparse treats the following part as the hostname, and replaces the original request's hostname. This issue, combined with user interaction, may become...

webob: WebOb's location header normalization during redirect leads to open redirect

A vulnerability was found in the WebOb package. WebOb normalizes the HTTP Location header using urlparse and urljoin. If the URL starts with //, urlparse treats the following part as the hostname, and replaces the original request's hostname. This issue, combined with user interaction, may become...

Puma's header normalization allows for client to clobber proxy set headers

Impact Clients could clobber values set by intermediate proxies such as X-Forwarded-For by providing a underscore version of the same header X-ForwardedFor. Any users trusting headers set by their proxy may be affected. Attackers may be able to downgrade connections to HTTP non-SSL or redirect...

GHSA-9HF4-67FC-4VF4 Puma's header normalization allows for client to clobber proxy set headers

Impact Clients could clobber values set by intermediate proxies such as X-Forwarded-For by providing a underscore version of the same header X-ForwardedFor. Any users trusting headers set by their proxy may be affected. Attackers may be able to downgrade connections to HTTP non-SSL or redirect...

Puma's header normalization allows for client to clobber proxy set headers

Impact Clients could clobber values set by intermediate proxies such as X-Forwarded-For by providing a underscore version of the same header X-ForwardedFor. Any users trusting headers set by their proxy may be affected. Attackers may be able to downgrade connections to HTTP non-SSL or redirect...

HTTP Request Smuggling

Overview puma is a simple, fast, threaded, and highly concurrent HTTP 1.1 server for Ruby/Rack applications. Puma is intended for use in both development and production environments. It's great for highly concurrent Ruby implementations such as Rubinius and JRuby as well as as providing process...

CVE-2024-45614 Header normalization allows for client to clobber proxy set headers in Puma

Puma is a Ruby/Rack web server built for parallelism. In affected versions clients could clobber values set by intermediate proxies such as X-Forwarded-For by providing a underscore version of the same header X-ForwardedFor. Any users relying on proxy set variables is affected. v6.4.3/v5.6.9 now...

CVE-2024-45614 Header normalization allows for client to clobber proxy set headers in Puma

Puma is a Ruby/Rack web server built for parallelism. In affected versions clients could clobber values set by intermediate proxies such as X-Forwarded-For by providing a underscore version of the same header X-ForwardedFor. Any users relying on proxy set variables is affected. v6.4.3/v5.6.9 now...