CVE-2026-88009

HIGHNVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 81% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.2Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
42(Track)
EG Risk 42/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity82% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
19%
KEV
Not listed

Published

September 10, 2026

Last Modified

September 14, 2026

Advisory Details (5)

Auto-updated Sep 10, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_pr, github_commit, github_release.
github_release Patch Available

v3.7.13

Patch available: traefik/traefik v3.7.13

https://github.com/traefik/traefik/releases/tag/v3.7.13
github_release Patch Available

v2.11.57

Patch available: traefik/traefik v2.11.57

https://github.com/traefik/traefik/releases/tag/v2.11.57
github_commit

commit 58d1e9ca2045 (traefik/traefik)

Fix landed in traefik/traefik commit 58d1e9ca2045 — awaiting tagged release

https://github.com/traefik/traefik/commit/58d1e9ca204526823211e30fd4634101c59d58e9
github_pr

Deny request with an opaque request target

Fix merged in traefik/traefik PR #13796 on 2026-08-28 — awaiting tagged release

https://github.com/traefik/traefik/pull/13796
github Patch Available🟡 PoC Available

Rootless HTTP/1 request-target routes as "/" but is forwarded verbatim, bypassing path-scoped routing, middleware guards and access logging · Advisory · traefik/traefik · GitHub

https://github.com/traefik/traefik/security/advisories/GHSA-f52w-8j3h-j724

Vendor Advisories for CVE-2026-88009(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(2 across 1 ecosystem)
Go(2)
PackageVulnerable rangeFixed inDependents
github.com/traefik/traefik/v2—2.11.57—
github.com/traefik/traefik/v3—3.7.13—

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 16× in last 7d / 22× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-19 03:44 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 01:54 UTCEG score recompute
  4. 2026-09-17 19:32 UTCEPSS rescore
  5. 2026-09-16 23:39 UTCEG score recompute
  6. 2026-09-16 14:09 UTCEPSS rescore
  7. 2026-09-16 10:44 UTCEG score recompute
  8. 2026-09-16 05:15 UTCEPSS rescore
  9. 2026-09-15 08:55 UTCEG score recompute
  10. 2026-09-15 03:12 UTCEPSS rescore
  11. 2026-09-14 20:00 UTCEG score recompute▼ 0.60
  12. 2026-09-14 19:59 UTCNVD updateCVSS v3 → 8.2
  13. 2026-09-14 01:31 UTCEG score recompute
  14. 2026-09-13 16:48 UTCEPSS rescore
  15. 2026-09-12 23:40 UTCEG score recompute
  16. 2026-09-12 15:02 UTCEPSS rescore
  17. 2026-09-11 21:49 UTCEG score recompute
  18. 2026-09-11 14:53 UTCEPSS rescore
  19. 2026-09-11 14:53 UTCEPSS rescore
  20. 2026-09-10 16:21 UTCEG score recompute
  21. 2026-09-10 15:20 UTCEG score recompute
  22. 2026-09-10 15:20 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-88009?
CVE-2026-88009 is a high vulnerability published on September 10, 2026. 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,…
When was CVE-2026-88009 disclosed?
CVE-2026-88009 was first published in the National Vulnerability Database on September 10, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88009 actively exploited?
CVE-2026-88009 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 80.6% of all scored CVEs.
What is the CVSS score of CVE-2026-88009?
CVE-2026-88009 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-88009?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-88009, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-88009

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