CVE-2026-88012Public exploitNetwork attack vector

Backend connection exhaustion via unbounded HTTP/3 bodies

Published Sep 10, 2026 · Updated Sep 10, 2026

Resource exhaustion in Traefik Proxy 2.8.2 through 2.11.55 and 3.0.0 through 3.7.11 allows remote attackers to hold upstream connections. The HTTP/3 server omits a QUIC-stream read deadline because respondingTimeouts.readTimeout is applied only to TCP connections. HTTP/3 must be enabled; slow request bodies can indefinitely occupy one upstream connection each and exhaust bounded backend pools.

CVSS severity5.3
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Traefik Proxy 2.8.2 through 2.11.55 and 3.0.0 through 3.7.11 allows remote attackers to hold upstream connections. The HTTP/3 server omits a QUIC-stream read deadline because respondingTimeouts.readTimeout is applied only to TCP connections. HTTP/3 must be enabled; slow request bodies can indefinitely occupy one upstream connection each and exhaust bounded backend pools.

The record

CVE
CVE-2026-88012
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
Traefik Labs
Product
Traefik Proxy
Classifications
CWE-770, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 2.8.2, < 2.11.56
  2. Affected versionversion=>= 3.0.0, < 3.7.12

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Traefik Labs · Traefik Proxyversion=>= 2.8.2, < 2.11.56; version=>= 3.0.0, < 3.7.12

Published CVSS scores

5.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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