CVE-2025-64484
HIGH8.5EPSS 0.04%OAuth2-Proxy is vulnerable to header smuggling via underscore leading to potential privilege escalation in github.com/oauth2-proxy/oauth2-proxy
Published: 11/12/2025Modified: 3/3/2026
Description
OAuth2-Proxy is vulnerable to header smuggling via underscore leading to potential privilege escalation in github.com/oauth2-proxy/oauth2-proxy
Affected packages (4)
- Bitnami/oauth2-proxyfrom 0, < 7.13.0
- Go/github.com/oauth2-proxy/oauth2-proxyfrom 0
- Go/github.com/oauth2-proxy/oauth2-proxy/v7from 0, < 7.13.0
- Go/github.com/oauth2-proxy/oauth2-proxy/v7from 0, < 7.13.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | HIGH8.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N |
References (9)
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2025-64484
- PATCHhttps://github.com/oauth2-proxy/oauth2-proxy
- WEBhttps://datatracker.ietf.org/doc/html/rfc2616#section-4.2
- WEBhttps://datatracker.ietf.org/doc/html/rfc822#section-3.2
- WEBhttps://github.com/oauth2-proxy/oauth2-proxy/commit/f3f30fa976fb4bb97d6345ba4735cb6d86e24f95
- WEBhttps://github.com/oauth2-proxy/oauth2-proxy/releases/tag/v7.13.0
- WEBhttps://github.com/oauth2-proxy/oauth2-proxy/security/advisories/GHSA-vjrc-mh2v-45x6
- WEBhttps://github.security.telekom.com/2020/05/smuggling-http-headers-through-reverse-proxies.html
- WEBhttps://www.uptimia.com/questions/why-are-http-headers-with-underscores-dropped-by-nginx