1sealsemantic last-mile verification

Research / Finding

TLS Handshake Error Handling Allows Stalled Connections on TCP Routers

F-TRAEFIK-004

Public snapshot: 26 Sep 2026. Status, releases and attribution belong to each source below; none is inferred from another record.

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Recorded evidence

7.5high
CVE-2026-26999CVEtraefik/traefik

TLS Handshake Error Handling Allows Stalled Connections on TCP Routers

Upstream fixed versions: Traefik: v2.11.38; Traefik: v3.6.9

patched
details
Finding IDs
F-TRAEFIK-004
CVE
CVE-2026-26999
GHSA
GHSA-xw98-5q62-jx94
Status
patched
Fixed in
Traefik: v2.11.38; Traefik: v3.6.9
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVE registry state
PUBLISHED
CVE state checked
Upstream title
TLS Handshake Error Handling Allows Stalled Connections on TCP Routers
Upstream CWE
CWE-400
Upstream publication
Upstream updated
Metadata fetched
Upstream fixed versions
Traefik: v2.11.38; Traefik: v3.6.9
Upstream affected ranges
Traefik: <= v2.11.37; Traefik: <= v3.6.8
Upstream @1seal credit
@1seal: reporter (accepted)

F-TRAEFIK-004: Resource limits. Incomplete TCP handshakes retain resources without an effective bound. Reviewed 24 Sep 2026. Mechanism assessed by 1seal.

Mechanism source for F-TRAEFIK-004

Security area (1seal assessment): Availability. Incomplete TCP handshakes retain resources without an effective bound. Reviewed 24 Sep 2026.

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How this page groups evidence

This identifier groups recorded evidence; it is not an additional CVE, independent-vulnerability count or guarantee of vendor confirmation. Fixed code, released versions, attribution and independent discovery are distinct claims. Absent metadata means not recorded, not disproved. Counting rules.