CVE catalog
CVE-2026-26998
Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.38 and 3.6.9, there is a potential vulnerability in Traefik managing the ForwardAuth middleware responses. When Traefik is co
- Severity
- Medium · CVSS 4.4
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.48% · Oct 25, 2026
A flaw was found in Traefik, an HTTP reverse proxy and load balancer. When Traefik is configured to use the ForwardAuth middleware, it reads the authentication server's response body into memory without a size limit. A malicious or misconfigured authentication server could send an excessively large response, causing Traefik to consume all available memory. This leads to an out-of-memory (OOM) condition, crashing the Traefik process and resulting in a denial of service for all routes it manages. github.com/traefik/traefik: Traefik: Denial of Service due to unbounded ForwardAuth middleware response processing The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Go | github.com/traefik/traefik/v2 | Not reported | 2.11.38 | fixed |
| Go | github.com/traefik/traefik/v3 | Not reported | 3.6.9 | fixed |
| Go | github.com/traefik/traefik | Not reported | Not reported | unknown |
| Go | github.com/traefik/traefik/v2 | Not reported | 2.11.38 | fixed |
| Go | github.com/traefik/traefik/v3 | Not reported | 3.6.9 | fixed |
| Opensuse | traefik | tumbleweed | 3.6.10-1.1 | fixed |
| Opensuse | traefik2 | tumbleweed | 2.11.40-1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Go | github.com/traefik/traefik/v2 | go | Not reported | 2.11.38 | Not reported | Not reported | Not reported |
| Go | github.com/traefik/traefik/v3 | go | Not reported | 3.6.9 | Not reported | Not reported | Not reported |
| Go | github.com/traefik/traefik/v2 | Go | Not reported | 2.11.38 | Not reported | Not reported | Not reported |
| Go | github.com/traefik/traefik/v3 | Go | Not reported | 3.6.9 | Not reported | Not reported | Not reported |
| Opensuse | traefik | rpm | tumbleweed | 3.6.10-1.1 | Not reported | OPENSUSE-SU-2026:10323-1 | Not reported |
| Opensuse | traefik2 | rpm | tumbleweed | 2.11.40-1.1 | Not reported | OPENSUSE-SU-2026:10314-1 | Not reported |
OpenFactory catalog packages
[openSUSE Tumbleweed]
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_10314-1.json]
- [https://github.com/advisories/GHSA-fw45-f5q2-2p4x]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-26998]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10314-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10323-1]
- [https://pkg.go.dev/vuln/GO-2026-4593]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26998.json]
[FIRST EPSS] · [GitHub Advisory Database] · [Go Vulnerability Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]