CVE-2026-88009High· 8.2▾ MidnightPoC availableTraefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.57, and 3.7.13, Traefik accepts a rootless HTTP/1 request target that Go stores in URL.Opaque while leaving URL.Path empty. The rewriteRequestBuilder path eval…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 45.1 · likelihood 0.1 · exploitation 12
A public proof-of-concept already exists for this vulnerability — see Exploit availability below.
Public exploit / PoC code seen in 1 source. Availability, not in-the-wild use.
Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Sep 13.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via NVD
0.3%
Last analysed / modified upstream
8.8 → 8.2
0.3% → 0.4%
1 GitHub repo
Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.57, and 3.7.13, Traefik accepts a rootless HTTP/1 request target that Go stores in URL.Opaque while leaving URL.Path empty. The rewriteRequestBuilder path evaluates routing, path sanitization, forwardAuth, encodedCharacters, and access logging against a path normalized to / but forwards URL.Opaque verbatim to the backend, allowing cross-vhost routing bypass, path-scoped authorization bypass, and access-log evasion when the backend interprets the opaque target as a path. This issue is fixed in 2.11.57 and 3.7.13.
traefik < 2.11.57traefik >= 3.0.0, < 3.7.13Upgrade past the affected range:
traefik 3.7.13Affected packages:
github.com/traefik/traefik/v3 >= 3.0.0, < 3.7.13github.com/traefik/traefik/v2 < 2.11.57Patched in:
github.com/traefik/traefik/v3 3.7.13github.com/traefik/traefik/v2 2.11.57Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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