CVE-2026-71324

HIGHPre-NVD 7.07.0—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.6%, top 56% 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, secondary
7.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.0Exploit: 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 2.11.53, 3.6.24, and 3.7.9, Traefik's default HTTP reverse proxy forwards a plain HTTP/2 or HTTP/3 CONNECT request and its body to an HTTP/1.1 upstream through a shared net/http.Transport. When the upstream answers the CONNECT with a keep-alive non-2xx response and does not drain the body, Traefik returns the desynchronized backend socket to its shared pool and reuses it for other clients. An unauthenticated attacker can use this behavior to make a different client read the attacker's smuggled response, which can include authenticated or private content from another request. The ForwardAuth middleware with forwardBody true and preserveRequestMethod true can re-issue a CONNECT with the buffered body attached, exposing the auth-client pool to the same desynchronization. This issue is fixed in 2.11.53, 3.6.24, and 3.7.9.

CVSS v3
7.0
EG Score
7.0(medium)
EG Risk
47(Track)
EG Risk 47/100SSVC: 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
Severity70% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
44%
KEV
Not listed

Published

August 6, 2026

Last Modified

August 7, 2026

Advisory Details (10)

Auto-updated Aug 6, 2026
🔬 Proof of concept available. Patch available. Sources: github_pr, github_release, github, github_commit.
github Patch Available🟡 PoC Available

Cross-user response poisoning via proxied CONNECT on Traefik's shared backend keep-alive pool · Advisory · traefik/traefik · GitHub

https://github.com/traefik/traefik/security/advisories/GHSA-3ccp-42pg-hgv6
github_release Patch Available

v3.7.9

Patch available: traefik/traefik v3.7.9

https://github.com/traefik/traefik/releases/tag/v3.7.9
github_release Patch Available

v3.6.24

Patch available: traefik/traefik v3.6.24

https://github.com/traefik/traefik/releases/tag/v3.6.24
github_release Patch Available

v2.11.53

Patch available: traefik/traefik v2.11.53

https://github.com/traefik/traefik/releases/tag/v2.11.53
github_pr

Do not add back CONNECT requests to the pool

Fix merged in traefik/traefik PR #13556 on 2026-07-23 — awaiting tagged release

https://github.com/traefik/traefik/pull/13556
github_pr

Discard CONNECT body in forwardauth and reject CONNECT requests with fast proxy

Fix merged in traefik/traefik PR #13543 on 2026-07-22 — awaiting tagged release

https://github.com/traefik/traefik/pull/13543
github_pr

Defer the CONNECT payload until the backend accepts the tunnel

Fix merged in traefik/traefik PR #13542 on 2026-07-22 — awaiting tagged release

https://github.com/traefik/traefik/pull/13542
github_commit

commit 94a7508817d1 (traefik/traefik)

Fix landed in traefik/traefik commit 94a7508817d1 — awaiting tagged release

https://github.com/traefik/traefik/commit/94a7508817d180f0ab2f1eae93df48d4ab19ecce
github_commit

commit 0807b6d5dd1d (traefik/traefik)

Fix landed in traefik/traefik commit 0807b6d5dd1d — awaiting tagged release

https://github.com/traefik/traefik/commit/0807b6d5dd1da8b2f7f4076ea2392b5437bf2ab0
github_commit

commit 04d36f28e4ea (traefik/traefik)

Fix landed in traefik/traefik commit 04d36f28e4ea — awaiting tagged release

https://github.com/traefik/traefik/commit/04d36f28e4eae7535e96a6351dd9f7bfb48a30e7

Vendor Advisories for CVE-2026-71324(1)

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

Affected Packages

(3 across 1 ecosystem)
Go(3)
PackageVulnerable rangeFixed inDependents
github.com/traefik/traefik———
github.com/traefik/traefik/v2—2.11.53—
github.com/traefik/traefik/v3—3.7.9—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 16× in last 7d / 33× 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. 2026-08-20 23:57 UTCEG score recompute
  2. 2026-08-20 22:56 UTCEPSS rescore
  3. 2026-08-20 00:19 UTCEG score recompute
  4. 2026-08-19 17:04 UTCEPSS rescore
  5. 2026-08-19 00:38 UTCEG score recompute
  6. 2026-08-18 13:49 UTCEPSS rescore
  7. 2026-08-18 13:49 UTCEPSS rescore
  8. 2026-08-18 00:57 UTCEG score recompute
  9. 2026-08-17 13:47 UTCEPSS rescore
  10. 2026-08-17 01:04 UTCEG score recompute
  11. 2026-08-16 14:56 UTCEPSS rescore
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 13:14 UTCEG score recompute
  14. 2026-08-16 02:15 UTCEPSS rescore
  15. 2026-08-15 01:45 UTCEG score recompute
  16. 2026-08-15 01:31 UTCEPSS rescore
  17. 2026-08-14 02:06 UTCEG score recompute
  18. 2026-08-13 22:00 UTCEPSS rescore
  19. 2026-08-12 14:38 UTCEG score recompute
  20. 2026-08-12 13:51 UTCEPSS rescore
  21. 2026-08-11 14:58 UTCEG score recompute
  22. 2026-08-11 03:08 UTCEG score recompute
  23. 2026-08-11 00:00 UTCEPSS rescore
  24. 2026-08-09 15:40 UTCEG score recompute
  25. 2026-08-09 13:47 UTCEPSS rescore
Show 8 more
  1. 2026-08-09 03:51 UTCEG score recompute
  2. 2026-08-08 16:37 UTCEPSS rescore
  3. 2026-08-08 04:12 UTCEG score recompute
  4. 2026-08-07 16:23 UTCEG score recompute
  5. 2026-08-07 16:03 UTCEG score recompute
  6. 2026-08-06 22:37 UTCEG score recompute▲ 7.00
  7. 2026-08-06 22:37 UTCNVD updateCVSS v3 → 7 · CVSS v4 → 7
  8. 2026-08-06 16:07 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-71324?
CVE-2026-71324 is a high vulnerability published on August 6, 2026. Traefik is an open source HTTP reverse proxy and load balancer. Prior to 2.11.53, 3.6.24, and 3.7.9, Traefik's default HTTP reverse proxy forwards a plain HTTP/2 or HTTP/3 CONNECT request and its body to an HTTP/1.1 upstream through a shared net/http.Transport. When the upstream answers the CONNECT…
When was CVE-2026-71324 disclosed?
CVE-2026-71324 was first published in the National Vulnerability Database on August 6, 2026, with the most recent update on August 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-71324 actively exploited?
CVE-2026-71324 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 56.2% of all scored CVEs.
What is the CVSS score of CVE-2026-71324?
CVE-2026-71324 has a CVSS v3 base score of 7.0 (NVD).
How do I remediate CVE-2026-71324?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-71324, 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-2026-71324

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