How severe is CVE-2026-25949?

CVE-2026-25949 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-25949 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25949?

CVE-2026-25949 affects Traefik. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25949?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-25949 have an EU (EUVD) identifier?

Yes. CVE-2026-25949 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6207.

When was CVE-2026-25949 published?

CVE-2026-25949 was published on 2026-02-12 and last updated on 2026-06-30.

CVE-2026-25949

CVE-2026-25949 is a high-severity vulnerability in Traefik with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-6207
Weakness: CWE-400
Affected product: Traefik
Published: 2026-02-12
Last modified: 2026-06-30

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.

Frequently asked questions

What is CVE-2026-25949?: 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.
How severe is CVE-2026-25949?: CVE-2026-25949 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-25949 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25949?: CVE-2026-25949 affects Traefik. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25949?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-25949 have an EU (EUVD) identifier?: Yes. CVE-2026-25949 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-6207.
When was CVE-2026-25949 published?: CVE-2026-25949 was published on 2026-02-12 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:traefik:traefik:*:*:*:*:*:*:*:*

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