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.
CVE-2026-71324
“—” beside the score: it is equal to NVD's CVSS score.
This critical-severity CVE scores 9.1 under NVD CVSS v3. EPSS exploit probability: 1.1% (64th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Also known asEUVD-2026-54288 (ENISA EUVD) · GHSA-3ccp-42pg-hgv6 (GitHub Security Advisories)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 9.1
- EG Score
- 9.1CRITICALmedium confidence
- EG Risk
- 56EG Risk 56/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity91% × 45%Impact severity (EG Severity): CVSS 9.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation1.1% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability100% × 15%CISA's SSVC Automatable value: yes (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high. - EPSS PROB
- 1.1%
- EPSS %ILE
- 64th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (9.1): severity, escalated by confirmed exploitation. This CVE's 9.1 is its impact severity (EG Severity), not escalated.
- EG Severity
- 9.1 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
- EG Likelihood
- 1.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-02). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; 60 days if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
August 6, 2026
Last Modified
September 16, 2026
Advisory Details (10)
Auto-updated Aug 6, 2026Cross-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-hgv6v3.7.9
Patch available: traefik/traefik v3.7.9
https://github.com/traefik/traefik/releases/tag/v3.7.9v3.6.24
Patch available: traefik/traefik v3.6.24
https://github.com/traefik/traefik/releases/tag/v3.6.24v2.11.53
Patch available: traefik/traefik v2.11.53
https://github.com/traefik/traefik/releases/tag/v2.11.53Do 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/13556Discard 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/13543Defer 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/13542commit 94a7508817d1 (traefik/traefik)
Fix landed in traefik/traefik commit 94a7508817d1 — awaiting tagged release
https://github.com/traefik/traefik/commit/94a7508817d180f0ab2f1eae93df48d4ab19eccecommit 0807b6d5dd1d (traefik/traefik)
Fix landed in traefik/traefik commit 0807b6d5dd1d — awaiting tagged release
https://github.com/traefik/traefik/commit/0807b6d5dd1da8b2f7f4076ea2392b5437bf2ab0commit 04d36f28e4ea (traefik/traefik)
Fix landed in traefik/traefik commit 04d36f28e4ea — awaiting tagged release
https://github.com/traefik/traefik/commit/04d36f28e4eae7535e96a6351dd9f7bfb48a30e7Vendor Advisories for CVE-2026-71324(2)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Patch Availability(5)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| redhat | devspaces/traefik-rhel9:1792464177 | 2026-10-26 | redhat |
| go | github.com/traefik/traefik | — | ghsa |
| go | github.com/traefik/traefik/v2 @ 2.11.53 (fixes <= 2.11.52) | — | ghsa |
| go | github.com/traefik/traefik/v3 @ 3.6.24 (fixes <= 3.6.23) | — | ghsa |
| go | github.com/traefik/traefik/v3 @ 3.7.9 (fixes >= 3.7.0, <= 3.7.8) | — | ghsa |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(3 across 1 ecosystem)
Go(3)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| github.com/traefik/traefik | — |
| — |
| github.com/traefik/traefik/v2 | — |
| — |
| github.com/traefik/traefik/v3 | — |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 20× in last 7d / 66× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 100 of 168 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 68 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-03 02:08 UTCEG score recompute
- 2026-11-03 02:08 UTCVendor advisory
- 2026-11-03 02:08 UTCGHSA enrichmentGHSA-3ccp-42pg-hgv6 · GitHub severity HIGH
- 2026-11-02 16:46 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-11-02 01:14 UTCEG score recompute
- 2026-11-02 01:14 UTCVendor advisory
- 2026-11-02 01:14 UTCGHSA enrichmentGHSA-3ccp-42pg-hgv6 · GitHub severity HIGH
- 2026-11-01 07:39 UTCGHSA enrichmentGHSA-3ccp-42pg-hgv6 · GitHub severity HIGH
- 2026-11-01 00:20 UTCEG score recompute
- 2026-11-01 00:20 UTCVendor advisory
- 2026-10-31 16:33 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-30 23:27 UTCEG score recompute
- 2026-10-30 23:27 UTCVendor advisory
- 2026-10-30 16:35 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-29 22:35 UTCEG score recompute
- 2026-10-29 16:34 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-28 21:42 UTCEG score recompute
- 2026-10-28 16:33 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-27 20:50 UTCEG score recompute
- 2026-10-27 16:32 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-26 19:55 UTCEG score recompute
- 2026-10-26 16:32 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-25 16:49 UTCEG score recompute
- 2026-10-25 16:33 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-25 14:07 UTCEG score recompute
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- 2026-10-24 16:33 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-24 15:57 UTCEG score recompute
- 2026-10-23 16:32 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-23 15:05 UTCEG score recompute
- 2026-10-22 16:35 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-22 14:11 UTCEG score recompute
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-21 13:18 UTCEG score recompute
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-20 12:22 UTCEG score recompute
- 2026-10-19 16:33 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-19 11:28 UTCEG score recompute
- 2026-10-18 16:32 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-18 03:17 UTCEG score recompute
- 2026-10-17 16:35 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-17 08:09 UTCEG score recompute
- 2026-10-16 16:44 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-16 07:16 UTCEG score recompute
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 1.1% · 64th percentile
- 2026-10-15 06:09 UTCEG score recompute
- 2026-10-14 16:33 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
- 2026-10-14 01:45 UTCEG score recompute
- 2026-10-13 16:35 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
- 2026-10-12 21:57 UTCEG score recompute
- 2026-10-12 16:34 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
- 2026-10-12 15:43 UTCEG score recompute
- 2026-10-11 19:28 UTCEG score recompute
- 2026-10-11 16:43 UTCEG score recompute
- 2026-10-11 14:04 UTCEG score recompute
- 2026-10-11 13:49 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
- 2026-10-08 17:13 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
- 2026-10-07 23:48 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
- 2026-10-06 23:24 UTCEG score recompute
- 2026-10-06 15:18 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
- 2026-10-05 18:38 UTCEG score recompute
- 2026-10-05 17:43 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
- 2026-10-04 23:23 UTCEG score recompute
- 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-04 05:50 UTCEG score recompute
- 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-03 01:04 UTCEG score recompute
- 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-02 09:40 UTCEG score recompute
- 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-10-01 01:44 UTCEG score recompute
- 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.7% · 51st percentile
- 2026-09-29 05:54 UTCEG score recompute
- 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-27 17:30 UTCEG score recompute
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.7% · 50th percentile
- 2026-09-25 04:22 UTCEG score recompute
- 2026-09-23 21:18 UTCEG score recompute
- 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-09-22 21:20 UTCEG score recompute
- 2026-09-22 01:04 UTCEG score recompute
- 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-09-20 20:36 UTCEG score recompute
- 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-09-19 17:35 UTCEG score recompute
- 2026-09-18 22:17 UTCEG score recompute
- 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
- 2026-09-18 00:57 UTCEG score recompute
- 2026-09-16 21:11 UTCEG score recompute▲ 2.10
- 2026-09-16 21:01 UTCNVD updateCVSS v3 → 9.1 · severity → CRITICAL
- 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.6% · 44th percentile
- 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.6% · 44th percentile
- 2026-09-15 14:27 UTCEG score recompute
- 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.6% · 44th percentile
- 2026-09-14 01:40 UTCEG score recompute
- 2026-09-13 02:02 UTCEG score recompute
- 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.6% · 44th percentile
- 2026-09-12 02:22 UTCEG score recompute
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownGo:github.com/traefik/traefik/v3
Same vendor
10 shownredhat:RHSA-2026:90321
Frequently asked(5)
What is CVE-2026-71324?
When was the CVE record for CVE-2026-71324 published?
Is CVE-2026-71324 actively exploited?
What is the CVSS score of CVE-2026-71324?
How do I remediate CVE-2026-71324?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-71324
Is Your Infrastructure Affected by CVE-2026-71324?
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