CVE-2026-88012
Traefik: respondingTimeouts.readTimeout is not applied to HTTP/3, leaving slow-body uploads unbounded
Description
Traefik is an open source HTTP reverse proxy and load balancer. From 2.8.2 until 2.11.56 and 3.7.12, HTTP/3 entrypoints do not apply entryPoints..transport.respondingTimeouts.readTimeout because the timeout is enforced on a TCP connection and the HTTP/3 server has no corresponding QUIC stream deadline. An unauthenticated client can use a slow request body, trickling data indefinitely while holding a request and an upstream connection open and exhausting backends with bounded connection pools. This issue is fixed in 2.11.56 and 3.7.12.
INFO
Published Date :
Sept. 10, 2026, 4:18 p.m.
Last Modified :
Sept. 14, 2026, 8 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Traefik to version 2.11.56 or later.
- Update Traefik to version 3.7.12 or later.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-88012.
| URL | Resource |
|---|---|
| https://github.com/traefik/traefik/commit/a8d0bc425859dde7481a6c9a324e610b81d754d0 | Patch |
| https://github.com/traefik/traefik/pull/13717 | Issue Tracking Patch |
| https://github.com/traefik/traefik/releases/tag/v2.11.56 | Patch Release Notes |
| https://github.com/traefik/traefik/releases/tag/v3.7.12 | Patch Release Notes |
| https://github.com/traefik/traefik/security/advisories/GHSA-7ghq-v6jf-g56c | Patch Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-88012 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-88012
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-88012 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-88012 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Sep. 14, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* versions from (including) 3.0.0 up to (excluding) 3.7.12 *cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:* versions from (including) 2.8.2 up to (excluding) 2.11.56 Added Reference Type GitHub, Inc.: https://github.com/traefik/traefik/commit/a8d0bc425859dde7481a6c9a324e610b81d754d0 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/traefik/traefik/pull/13717 Types: Issue Tracking, Patch Added Reference Type GitHub, Inc.: https://github.com/traefik/traefik/releases/tag/v2.11.56 Types: Patch, Release Notes Added Reference Type GitHub, Inc.: https://github.com/traefik/traefik/releases/tag/v3.7.12 Types: Patch, Release Notes Added Reference Type GitHub, Inc.: https://github.com/traefik/traefik/security/advisories/GHSA-7ghq-v6jf-g56c Types: Patch, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Sep. 11, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-88012', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-09-11T16:34:35.938612Z'} -
New CVE Received by [email protected]
Sep. 10, 2026
Action Type Old Value New Value Added Description Traefik is an open source HTTP reverse proxy and load balancer. From 2.8.2 until 2.11.56 and 3.7.12, HTTP/3 entrypoints do not apply entryPoints..transport.respondingTimeouts.readTimeout because the timeout is enforced on a TCP connection and the HTTP/3 server has no corresponding QUIC stream deadline. An unauthenticated client can use a slow request body, trickling data indefinitely while holding a request and an upstream connection open and exhausting backends with bounded connection pools. This issue is fixed in 2.11.56 and 3.7.12. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Added CWE CWE-770 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/88xxx/CVE-2026-88012.json">CVE-2026-88012</a> Added Reference https://github.com/traefik/traefik/commit/a8d0bc425859dde7481a6c9a324e610b81d754d0 Added Reference https://github.com/traefik/traefik/pull/13717 Added Reference https://github.com/traefik/traefik/releases/tag/v2.11.56 Added Reference https://github.com/traefik/traefik/releases/tag/v3.7.12 Added Reference https://github.com/traefik/traefik/security/advisories/GHSA-7ghq-v6jf-g56c