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CVE-2026-49329— Openshift/oauth-server: openshift/oauth-server: quadratic-time dos via accept-language header underscore bypass on unauthenticated login endpoints

Quick assessment

Affected
Red Hat Red Hat OpenShift Container Platform 4
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 openshift/oauth-server 中发现了一个缺陷。OAuth 登录和错误页面端点将未经验证的 请求头传递给 ，且未进行输入校验。 针对 CVE-2022-32149 缓解措施存在一个绕过方式：上游的防护代码仅统计“-”字符的数量，但内部用于扫描 BCP 47 语言的逻辑在防护检查之后会将下划线“_”别名替换为连字符“-”。 因此，未认证的恶意攻击者可以发送一个使用下划线“_”作为分隔符的定制 请求头，从而触发二次方时间复杂度的解析过程，导致大量 CPU 资源被占用，进而使集群中的所有用户无法完成身

CVSS 7.5 · High
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I. Basic Information for CVE-2026-49329

Vulnerability Information
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Vulnerability Title
Openshift/oauth-server: openshift/oauth-server: quadratic-time dos via accept-language header underscore bypass on unauthenticated login endpoints
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in openshift/oauth-server. The OAuth login and error page endpoints pass the unauthenticated Accept-Language header to golang.org/x/text/language.ParseAcceptLanguage() without input validation. A bypass of the CVE-2022-32149 mitigation exists: the upstream guard counts only '-' characters but the internal BCP 47 scanner aliases '_' to '-' after the guard check. An unauthenticated attacker can send a crafted Accept-Language header using '_' separators to trigger quadratic-time parsing, consuming excessive CPU and denying authentication to all cluster users.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-49329

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III. Intelligence Information for CVE-2026-49329

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Other References for CVE-2026-49329 (2)

Same Patch Batch · Red Hat · 2026-09-01 · 10 CVEs total

CVE-2026-84268 8.8 HIGH Gvfs: sftp: heap-based buffer overflow in read_reply()
CVE-2026-84218 8.1 HIGH Org.jolokia/jolokia-core: incomplete jndi denylist in jolokia jsr-160 proxy (bypass of cve
CVE-2026-84233 7.0 HIGH Rpm: command execution via macro expansion in `rpmuncompress -x` for crafted `.gem` filena
CVE-2026-84269 6.5 MEDIUM Gvfs: afp: heap-based buffer overflow in dsi read path
CVE-2026-11873 6.5 MEDIUM Pki-core: dogtag-pki: empty request to dogtag /ca/rest/certrequests causes http 500, java
CVE-2026-84232 5.4 MEDIUM Pulpcore: python-pulpcore: stored cross-site scripting via inline rendering of uploaded ht
CVE-2026-53682 5.3 MEDIUM Pki-core: dogtag-pki: unauthenticated dogtag ca rest api exposes security domain hosts
CVE-2026-84270 4.3 MEDIUM Gvfs: mtp: out-of-bounds read in do_read()
CVE-2026-84267 4.3 MEDIUM Gvfs: sftp: uninitialized heap disclosure in read_string()

IV. Related Vulnerabilities

Same product: Red Hat OpenShift Container Platform 4
Same vendor: Red Hat
Same weakness: CWE-407

V. Comments for CVE-2026-49329

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