CVE-2026-88878

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreHIGH confidence

Score 5.3 from GitHub Security Advisory published 2026-09-10. a secondary CVSS source baseline 5.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Traefik is an HTTP reverse proxy and load balancer. In versions >= v2.8.2 through <= v2.11.55 and >= v3.0.0 through <= v3.7.11, the entryPoints..transport.respondingTimeouts settings — notably readTimeout, which is enabled by default at 60s — are not applied to the HTTP/3 request path. readTimeout is enforced as a deadline on the underlying TCP connection, which cannot be applied to a QUIC stream, and Traefik's HTTP/3 server is constructed without any timeout. As a result, on entry points with HTTP/3 enabled, an unauthenticated remote client that trickles request body bytes can hold a request open indefinitely and, with it, one upstream connection per request, exhausting bounded backend connection pools and causing denial of service. The issue was introduced in v2.8.2 when a quic-go API change removed the embedded http.Server that carried these timeouts. Fixed in v2.11.56 and v3.7.12.

CVSS v3
5.3
EG Score
5.3(high)
EG Risk
39(Track)
EG Risk 39/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
23%
KEV
Not listed

Published

September 10, 2026

Last Modified

September 14, 2026

Advisory Details (2)

Auto-updated Sep 10, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

Traefik v2.8.2 through v3.6 HTTP/3 Timeout Bypass | Advisories | VulnCheck

https://www.vulncheck.com/advisories/traefik-2.8.2-through-3.6-http-3-timeout-bypass
github Patch Available🟡 PoC Available

respondingTimeouts.readTimeout is not applied to HTTP/3, leaving slow-body uploads unbounded · Advisory · traefik/traefik · GitHub

https://github.com/traefik/traefik/security/advisories/GHSA-7ghq-v6jf-g56c

Vendor Advisories for CVE-2026-88878(1)

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

Affected Packages

(2 across 1 ecosystem)
Go(2)
PackageVulnerable rangeFixed inDependents
github.com/traefik/traefik/v2—2.11.56—
github.com/traefik/traefik/v3—3.7.12—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 19× 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. 2026-09-20 20:16 UTCEPSS rescore
  2. 2026-09-20 14:42 UTCGHSA enrichment
  3. 2026-09-19 16:28 UTCEG score recompute
  4. 2026-09-19 16:28 UTCGHSA enrichment
  5. 2026-09-18 19:28 UTCEPSS rescore
  6. 2026-09-18 18:16 UTCGHSA enrichment
  7. 2026-09-17 19:54 UTCEG score recompute
  8. 2026-09-17 19:54 UTCGHSA enrichment
  9. 2026-09-17 19:32 UTCEPSS rescore
  10. 2026-09-16 18:09 UTCEG score recompute
  11. 2026-09-16 18:09 UTCGHSA enrichment
  12. 2026-09-16 14:09 UTCEPSS rescore
  13. 2026-09-16 05:15 UTCEPSS rescore
  14. 2026-09-15 18:16 UTCEG score recompute
  15. 2026-09-15 18:16 UTCGHSA enrichment
  16. 2026-09-15 03:12 UTCEPSS rescore
  17. 2026-09-14 20:00 UTCGHSA enrichment
  18. 2026-09-14 08:07 UTCEG score recompute
  19. 2026-09-14 08:07 UTCGHSA enrichment
  20. 2026-09-13 16:48 UTCEPSS rescore
  21. 2026-09-13 09:56 UTCEG score recompute
  22. 2026-09-13 09:56 UTCGHSA enrichment
  23. 2026-09-12 15:02 UTCEPSS rescore
  24. 2026-09-12 11:45 UTCEG score recompute
  25. 2026-09-12 11:45 UTCGHSA enrichment
Show 8 more
  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-11 14:53 UTCEPSS rescore
  3. 2026-09-11 13:32 UTCEG score recompute
  4. 2026-09-11 13:32 UTCGHSA enrichment
  5. 2026-09-10 15:21 UTCEG score recompute
  6. 2026-09-10 14:19 UTCEG score recompute
  7. 2026-09-10 13:20 UTCEG score recompute
  8. 2026-09-10 13:20 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88878?
CVE-2026-88878 is a medium vulnerability published on September 10, 2026. Traefik is an HTTP reverse proxy and load balancer. In versions >= v2.8.2 through <= v2.11.55 and >= v3.0.0 through <= v3.7.11, the entryPoints.<name>.transport.respondingTimeouts settings — notably readTimeout, which is enabled by default at 60s — are not applied to the HTTP/3 request path.…
When was CVE-2026-88878 disclosed?
CVE-2026-88878 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-2026-88878 actively exploited?
CVE-2026-88878 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 76.6% of all scored CVEs.
What is the CVSS score of CVE-2026-88878?
CVE-2026-88878 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-88878?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-88878, 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-2026-88878

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