{"cve":"CVE-2026-26998","nvd":{"published":"2026-03-05T19:16:05.140","modified":"2026-06-17T10:26:30.763","status":"Analyzed","description":"Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.38 and 3.6.9, there is a potential vulnerability in Traefik managing the ForwardAuth middleware responses. When Traefik is configured to use the ForwardAuth middleware, the response body from the authentication server is read entirely into memory without any size limit. There is no maxResponseBodySize configuration to restrict the amount of data read from the authentication server response. If the authentication server returns an unexpectedly large or unbounded response body, Traefik will allocate unlimited memory, potentially causing an out-of-memory (OOM) condition that crashes the process. This results in a denial of service for all routes served by the affected Traefik instance. This issue has been patched in versions 2.11.38 and 3.6.9.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H","score":4.4},"cwes":["CWE-770"],"references":["https://github.com/traefik/traefik/releases/tag/v2.11.38","https://github.com/traefik/traefik/releases/tag/v3.6.9","https://github.com/traefik/traefik/security/advisories/GHSA-fw45-f5q2-2p4x"],"products":["traefik:traefik"],"source":"nvd","synced_at":"2026-10-19T22:25:53.701907451+00:00"},"epss":{"cve":"CVE-2026-26998","score":0.00508,"percentile":0.43391,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-fw45-f5q2-2p4x","url":"https://osv.dev/vulnerability/GHSA-fw45-f5q2-2p4x","summary":"Traefik has unbounded io.ReadAll on auth server response body that causes OOM DOS","modified":"2026-04-16T02:14:28.871092916Z","packages":[{"ecosystem":"Go","name":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","ranges":["<2.11.38"],"fixed":["2.11.38"]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","ranges":["<3.6.9"],"fixed":["3.6.9"]}]},{"id":"GO-2026-4593","url":"https://osv.dev/vulnerability/GO-2026-4593","summary":"Traefik has unbounded io.ReadAll on auth server response body that causes OOM DOS in github.com/traefik/traefik","modified":"2026-04-16T02:14:29.758100331Z","packages":[{"ecosystem":"Go","name":"github.com/traefik/traefik","purl":"pkg:golang/github.com/traefik/traefik","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v2","purl":"pkg:golang/github.com/traefik/traefik/v2","ranges":["<2.11.38"],"fixed":["2.11.38"]},{"ecosystem":"Go","name":"github.com/traefik/traefik/v3","purl":"pkg:golang/github.com/traefik/traefik/v3","ranges":["<3.6.9"],"fixed":["3.6.9"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}