CVE-2026-88004

HIGHNVD 7.47.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.4 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 80% 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
7.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.4Exploit: 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. From 3.2.0 until 3.7.13, Traefik entrypoint defenses aliasHeadersStrategy, underscoreHeadersStrategy, and forwardedHeaders inspect req.Header but not req.Trailer, allowing an unauthenticated client to submit an aliasing or trusted header name in an HTTP/1.1 chunked trailer or an HTTP/2 trailer. When the retry or buffering middleware reads the body before the reverse proxy clones the request, the attacker-controlled trailer value reaches a backend that merges trailers into the header namespace, bypassing the documented delete or reject behavior and potentially spoofing identity or forwarded routing data. This issue is fixed in 3.7.13.

CVSS v3
7.4
EG Score
7.4(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity74% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
20%
KEV
Not listed

Published

September 10, 2026

Last Modified

September 14, 2026

Advisory Details (4)

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_commit

commit 55bbda4f65e0 (traefik/traefik)

Fix landed in traefik/traefik commit 55bbda4f65e0 — awaiting tagged release

https://github.com/traefik/traefik/commit/55bbda4f65e0f9c533c870983a767a7081126db7
github_pr

Do not forward request trailer values to the backend

Fix merged in traefik/traefik PR #13822 on 2026-09-03 — awaiting tagged release

https://github.com/traefik/traefik/pull/13822
github Patch Available🟡 PoC Available

Traefik entrypoint header-name sanitization bypassed via request trailers · Advisory · traefik/traefik · GitHub

https://github.com/traefik/traefik/security/advisories/GHSA-v67p-phpq-fc8x

Vendor Advisories for CVE-2026-88004(1)

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

Affected Packages

(1 across 1 ecosystem)
Go(1)
PackageVulnerable rangeFixed inDependents
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. 2026-09-18 21:19 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-17 21:02 UTCEG score recompute
  4. 2026-09-17 19:32 UTCEPSS rescore
  5. 2026-09-16 21:13 UTCEG score recompute
  6. 2026-09-16 14:09 UTCEPSS rescore
  7. 2026-09-16 08:51 UTCEG score recompute
  8. 2026-09-16 05:15 UTCEPSS rescore
  9. 2026-09-15 07:55 UTCEG score recompute
  10. 2026-09-15 03:12 UTCEPSS rescore
  11. 2026-09-14 20:00 UTCEG score recompute▲ 0.40
  12. 2026-09-14 19:59 UTCNVD updateCVSS v3 → 7.4
  13. 2026-09-13 19:47 UTCEG score recompute
  14. 2026-09-13 16:48 UTCEPSS rescore
  15. 2026-09-12 19:58 UTCEG score recompute
  16. 2026-09-12 15:02 UTCEPSS rescore
  17. 2026-09-11 20:08 UTCEG score recompute
  18. 2026-09-11 14:53 UTCEPSS rescore
  19. 2026-09-11 14:53 UTCEPSS rescore
  20. 2026-09-10 15:20 UTCEG score recompute
  21. 2026-09-10 14:45 UTCEG score recompute
  22. 2026-09-10 14:44 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-88004?
CVE-2026-88004 is a high vulnerability published on September 10, 2026. Traefik is an open source HTTP reverse proxy and load balancer. From 3.2.0 until 3.7.13, Traefik entrypoint defenses aliasHeadersStrategy, underscoreHeadersStrategy, and forwardedHeaders inspect req.Header but not req.Trailer, allowing an unauthenticated client to submit an aliasing or trusted…
When was CVE-2026-88004 disclosed?
CVE-2026-88004 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-2026-88004 actively exploited?
CVE-2026-88004 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 80.1% of all scored CVEs.
What is the CVSS score of CVE-2026-88004?
CVE-2026-88004 has a CVSS v3 base score of 7.4 (NVD).
How do I remediate CVE-2026-88004?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-88004, 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-2026-88004

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