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CVE-2026-61629— nginx ignition has ParseAcceptLanguage `_` separator bypass that enables ~75x CPU amplification via Accept-Language header in i18nMiddleware

一分钟漏洞结论

影响对象
lucasdillmann nginx-ignition
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

nginx ignition is a user interface for the nginx web server. In versions 2.29.0 through 2.40.0, the gin i18n middleware in nginx-ignition's API server runs in front of every HTTP request and calls on the raw header without imposing any size or shape filter. Th

CVSS 7.5 · High EPSS 0.36% · P30

影响版本矩阵 1

厂商产品 版本范围状态
lucasdillmann nginx-ignition >= 2.29.0, < 2.40.1 affected
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一、 漏洞 CVE-2026-61629 基础信息

漏洞信息

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Vulnerability Title
nginx ignition has ParseAcceptLanguage `_` separator bypass that enables ~75x CPU amplification via Accept-Language header in i18nMiddleware
来源: CVE Program / CVE List V5
Vulnerability Description
nginx ignition is a user interface for the nginx web server. In versions 2.29.0 through 2.40.0, the gin i18n middleware in nginx-ignition's API server runs in front of every HTTP request and calls `golang.org/x/text/language.ParseAcceptLanguage` on the raw `Accept-Language` header without imposing any size or shape filter. The underlying parser has quadratic-time behaviour on long lists of malformed language tags. The CVE-2022-32149 guard that golang.org/x/text added in v0.3.8 caps the number of `-` characters in the input at 1000, but it does not cap `_` characters even though the parser's internal scanner aliases `_` to `-` before parsing. A single unauthenticated GET request with an `Accept-Language` header built out of `_` separators burns about 2.4 seconds of server CPU on the host running nginx-ignition; ten concurrent attackers saturate a ten-core box for the duration of the attack while consuming ~10 MiB/s of upstream bandwidth. Version 2.40.1 fixes this issue.
来源: 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
来源: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
lucasdillmann nginx-ignition >= 2.29.0, < 2.40.1 -

二、漏洞 CVE-2026-61629 的公开POC

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三、漏洞 CVE-2026-61629 的情报信息

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CVE-2026-61629 补丁与修复 (2)

CVE-2026-61629 其他参考 (1)

同批安全公告 · lucasdillmann · 2026-09-21 · 共 3 条

CVE-2026-61628 8.1 HIGH nginx ignition has Unauthenticated Admin Account Creation via Onboarding Race Condition
CVE-2026-61630 4.2 MEDIUM nginx ignition has TOTP Reuse During Validity Window

IV. Related Vulnerabilities

Same product: nginx-ignition
Same vendor: lucasdillmann
Same weakness: CWE-770

V. Comments for CVE-2026-61629

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