CVE-2026-25949: Traefik: TCP readTimeout bypass via STARTTLS on Postgres
Vulnerability summary
CVE-2026-25949 is a high (CVSS 7.5) Uncontrolled Resource Consumption vulnerability in traefik. EPSS estimates a 0.78% chance of exploitation in the next 30 days, higher than 56% of scored vulnerabilities.
Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 2 · Related 3Timeline
- 12-02-2026PublishedVulnerability first disclosed.
- 15-07-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · GoEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · ChainguardEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.78%
Chance of exploitation in the next 30 days
Percentile
56%
Versus all other CVEs
30-day change
Decrease -0.05 pp
From 0.83% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-400Uncontrolled Resource ConsumptionThe product does not properly control the allocation and maintenance of a limited resource.
- CWE-770Allocation of Resources Without Limits or ThrottlingThe product allocates a reusable resource or group of resources on behalf of an actor without imposing any intended restrictions on the size or number of resources that can be allocated.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Chainguard4 products
- traefik-2.11< 2.11.38-r0
- traefik-3.5< 3.5.6-r6
- traefik-fips-2.11< 2.11.51-r0
- traefik-fips-3.5All versions (No fix recorded)
Github.com/traefik/traefik2 products
- v2All versions (No fix recorded)
- v3< 3.6.8
Github.com/traefik1 product
- traefikAll versions (No fix recorded)
Opensuse1 product
- traefik&distro=openSUSE Tumbleweed< 3.6.8-1.1
Traefik1 product
- traefik< 3.6.8
5 vendors · 9 products
References
11 links- github.com/traefik/traefik/security/advisories/GHSA-89p3-4642-cr2wX Refsource CONFIRMWEBAdvisoryPatchVendor Advisory
- github.com/traefik/traefik/commit/31e566e9f1d7888ccb6fbc18bfed427203c35678X Refsource MISCWEBFIXPatch
- github.com/traefik/traefikPACKAGE