{"id":"CVE-2026-61629","title":"nginx ignition is a user interface for the nginx web server","summary":"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.ParseAcceptL…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-770"],"vendor":"lucasdillmann","product":"nginx-ignition","affected":["nginx-ignition >= 2.29.0, < 2.40.1"],"patched":["github.com/lucasdillmann/nginx-ignition 0.0.0-20260526022344-0c988fc1277c"],"published":"2026-09-21","updated":"2026-09-24","sourceUpdated":"2026-09-24T23:17:13.280","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-61629","references":[{"url":"https://github.com/lucasdillmann/nginx-ignition/commit/0c988fc1277c7d291725e8373313f8486fa1b31a","label":"security-advisories@github.com"},{"url":"https://github.com/lucasdillmann/nginx-ignition/commit/cbaf0fc16ed873f7178a2ca9b0d00a696e44b485","label":"security-advisories@github.com"},{"url":"https://github.com/lucasdillmann/nginx-ignition/security/advisories/GHSA-jr34-h97m-9hpx","label":"security-advisories@github.com"},{"url":"https://github.com/lucasdillmann/nginx-ignition/security/advisories/GHSA-jr34-h97m-9hpx","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61629"},{"url":"https://github.com/lucasdillmann/nginx-ignition/pull/125"},{"url":"https://github.com/lucasdillmann/nginx-ignition/releases/tag/2.40.1"},{"url":"https://github.com/advisories/GHSA-jr34-h97m-9hpx"},{"url":"https://github.com/lucasdillmann/nginx-ignition"}],"tags":["nvd","cve.org","ghsa","go","osv","exploit-available"],"epss":0.00421,"epssPercentile":0.36221,"aliases":["GHSA-jr34-h97m-9hpx","GO-2026-6539"],"ecosystem":"go","exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"yes","technicalImpact":"partial","timestamp":"2026-09-24T22:11:10.143630Z"},"ingestedAt":"2026-09-21T14:38:56.369Z","slug":"CVE-2026-61629","body":"## Overview\n\nnginx 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-61629)\n\nAffected packages:\n\n- `github.com/lucasdillmann/nginx-ignition >= 0.0.0-20260126024607-cbaf0fc16ed8, < 0.0.0-20260526022344-0c988fc1277c`\n\nPatched in:\n\n- `github.com/lucasdillmann/nginx-ignition 0.0.0-20260526022344-0c988fc1277c`\n\nSource: https://github.com/advisories/GHSA-jr34-h97m-9hpx","depth":"midnight","depthScore":53,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[{"seq":210444,"id":"CVE-2026-61629","ts":1790290515770,"field":"exploit_available","old":"false","new":"true"}]}