CVE-2026-39858: Traefik Http Chain Missing Deny Encoded Characters
The Traefik HTTP entrypoint handler chain wires `denyFragment` (and `normalizePath`) but does not install `denyEncodedCharacters` in the same chain. Without this middleware, suspicious percent-encoded characters in the URL path (e.g. %0A, %0D, %2F, %5C, %00, %25, %3B) reach downstream middleware and authentication subrequests, where they can be used to forge
Gogreprules fetch cve-2026-39858-traefik-http-chain-missing-deny-encoded-characters --engine opengrepDescription
The Traefik HTTP entrypoint handler chain wires `denyFragment` (and `normalizePath`) but does not install `denyEncodedCharacters` in the same chain. Without this middleware, suspicious percent-encoded characters in the URL path (e.g. %0A, %0D, %2F, %5C, %00, %25, %3B) reach downstream middleware and authentication subrequests, where they can be used to forge
Community feedback
0 rule-level signals from signed-in users.
- Useful reports
- 0
- Context false positives
- 0
- Metadata suggestions
- 0
Contextual precision
Aggregated from approved scan feedback. False-positive reports describe observed scan contexts, not a global rule verdict.
- Findings observed
- 0
- Projects
- 0
- Reporters
- 0
Precision details are collecting more signed-in reports before verdict counts or ratios are emphasized.
No approved finding verdicts yet.
No scan diagnostics reported yet.