Unauthenticated service interruption via cleared STARTTLS deadline
Published Feb 12, 2026 · Updated Feb 12, 2026
Denial of service in Traefik Proxy before 3.6.8 allows remote attackers to exhaust process resources via a stalled STARTTLS request. The Postgres protocol-detection path clears the entrypoint read deadline before servePostgres waits for a TLS ClientHello, leaving the socket, goroutine, and file descriptor allocated. Any reachable TCP-switcher entrypoint with readTimeout is exposed, even without a Postgres router; sufficient concurrent connections interrupt proxy service.
Summary
What happened
Denial of service in Traefik Proxy before 3.6.8 allows remote attackers to exhaust process resources via a stalled STARTTLS request. The Postgres protocol-detection path clears the entrypoint read deadline before servePostgres waits for a TLS ClientHello, leaving the socket, goroutine, and file descriptor allocated. Any reachable TCP-switcher entrypoint with readTimeout is exposed, even without a Postgres router; sufficient concurrent connections interrupt proxy service.
The record
- CVE
- CVE-2026-25949
- Published
- Feb 12, 2026
- Updated
- Feb 12, 2026
- Vendor
- Traefik Labs
- Product
- Traefik Proxy
- Classifications
- CWE-770, CWE-400, T1499.004
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 12, 2026CVE publishedPublication date reported by the CVE source.
- Feb 12, 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.
- Affected versionversion=< 3.6.8
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Upstream STARTTLS readTimeout bypass proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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