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Traefik: TCP readTimeout bypass via STARTTLS on Postgres

Type: advisorySources: OSV

Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.8, there is a potential vulnerability in Traefik managing STARTTLS requests. An unauthenticated client can bypass Traefik entrypoint respondingTimeouts.readTimeout by sending the 8-byte Postgres SSLRequest (STARTTLS) prelude and then stalling, causing connections to remain open indefinitely, leading to a denial of service. This vulnerability is fixed in 3.6.8.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-25949
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 16:46 UTC · Revision 1

Source evidence

Traefik: TCP readTimeout bypass via STARTTLS on Postgres

core-osv · Original source

Published 12 Feb 2026, 20:01 UTC

Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.8, there is a potential vulnerability in Traefik managing STARTTLS requests. An unauthenticated client can bypass Traefik entrypoint respondingTimeouts.readTimeout by sending the 8-byte Postgres SSLRequest (STARTTLS) prelude and then stalling, causing connections to remain open indefinitely, leading to a denial of service. This vulnerability is fixed in 3.6.8.

osv:CVE-2026-25949
Complete source record
{
  "id": "29d9e13fda9c1ac4bc3073bad41babb0214b50715f1980c1e9a05e2dd997c5b0",
  "url": "https://osv.dev/vulnerability/CVE-2026-25949",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Traefik: TCP readTimeout bypass via STARTTLS on Postgres",
    "summary": "Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.8, there is a potential vulnerability in Traefik managing STARTTLS requests. An unauthenticated client can bypass Traefik entrypoint respondingTimeouts.readTimeout by sending the 8-byte Postgres SSLRequest (STARTTLS) prelude and then stalling, causing connections to remain open indefinitely, leading to a denial of service. This vulnerability is fixed in 3.6.8.",
    "evidence": "osv:CVE-2026-25949",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-25949",
      "aliases": [
        "CVE-2026-25949",
        "GHSA-89p3-4642-cr2w",
        "GO-2026-4484"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
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              "repo": "https://github.com/traefik/traefik",
              "type": "GIT",
              "events": [
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                {
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              "database_specific": {
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                    "range": [
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                    "source": "CPE_RANGE"
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          "database_specific": {
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          }
        }
      ],
      "modified": "2026-10-28T02:30:30.612144091Z",
      "provider": "osv",
      "references": [
        "https://github.com/traefik/traefik/releases/tag/v3.6.8",
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25949.json",
        "https://access.redhat.com/errata/RHSA-2026:6192",
        "https://access.redhat.com/security/cve/CVE-2026-25949",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25949.json",
        "https://github.com/traefik/traefik/security/advisories/GHSA-89p3-4642-cr2w",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-25949",
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        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/25xxx/CVE-2026-25949.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-25949",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 497518,
  "published_at": "2026-02-12T20:01:19.6+00:00"
}