How severe is CVE-2026-29777?

CVE-2026-29777 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-29777 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-29777?

CVE-2026-29777 affects Traefik. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-29777?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-29777 have an EU (EUVD) identifier?

Yes. CVE-2026-29777 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11201.

When was CVE-2026-29777 published?

CVE-2026-29777 was published on 2026-03-11 and last updated on 2026-06-17.

CVE-2026-29777

CVE-2026-29777 is a medium-severity vulnerability in Traefik with a CVSS 3.x base score of 6.5. 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-74.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v4: 6.1
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-11201
Weakness: CWE-74
Affected product: Traefik
Published: 2026-03-11
Last modified: 2026-06-17

Description

Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.10, A tenant with write access to an HTTPRoute resource can inject backtick-delimited rule tokens into Traefik's router rule language via unsanitized header or query parameter match values. In shared gateway deployments, this can bypass listener hostname constraints and redirect traffic for victim hostnames to attacker-controlled backends. This vulnerability is fixed in 3.6.10.

Frequently asked questions

What is CVE-2026-29777?: Traefik is an HTTP reverse proxy and load balancer. Prior to 3.6.10, A tenant with write access to an HTTPRoute resource can inject backtick-delimited rule tokens into Traefik's router rule language via unsanitized header or query parameter match values. In shared gateway deployments, this can bypass listener hostname constraints and redirect traffic for victim hostnames to attacker-controlled backends. This vulnerability is fixed in 3.6.10.
How severe is CVE-2026-29777?: CVE-2026-29777 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-29777 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-29777?: CVE-2026-29777 affects Traefik. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-29777?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-29777 have an EU (EUVD) identifier?: Yes. CVE-2026-29777 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-11201.
When was CVE-2026-29777 published?: CVE-2026-29777 was published on 2026-03-11 and last updated on 2026-06-17.

References

Affected products (1)

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

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