CVE-2026-39858
6 advisories.
Go/github.com/traefik/traefik/v3 CVE-2026-39858: critical 10
Traefik: Pre-authentication decision bypass due to forwarded alias spoofing
Action: Upgrade github.com/traefik/traefik/v3 to 3.6.14 or later.
go get github.com/traefik/traefik/v3@v3.7.0-rc.2go get github.com/traefik/traefik/v3@v3.6.14Affected
| introduced | fixed | last affected |
|---|---|---|
| 3.7.0-ea.1 | 3.7.0-rc.2 | - |
| 3.0.0-beta1 | 3.6.14 | - |
Fixed versions
| 3.7.0-rc.2 | 3.6.14 |
Sources
- osv: GHSA-5m6w-wvh7-57vm
- https://github.com/traefik/traefik/security/advisories/GHSA-5m6w-wvh7-57vm
- https://nvd.nist.gov/vuln/detail/CVE-2026-39858
- https://github.com/traefik/traefik
- https://github.com/traefik/traefik/releases/tag/v2.11.43
- https://github.com/traefik/traefik/releases/tag/v3.6.14
- https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2
CVE-2026-39858 · published · modified · JSON
Go/github.com/traefik/traefik/v2 CVE-2026-39858: critical 10
Traefik: Pre-authentication decision bypass due to forwarded alias spoofing
Action: Upgrade github.com/traefik/traefik/v2 to 2.11.43 or later.
go get github.com/traefik/traefik/v2@v2.11.43Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 2.11.43 | - |
Fixed versions
| 2.11.43 |
Sources
- osv: GHSA-5m6w-wvh7-57vm#Go/github.com/traefik/traefik/v2
- https://github.com/traefik/traefik/security/advisories/GHSA-5m6w-wvh7-57vm
- https://nvd.nist.gov/vuln/detail/CVE-2026-39858
- https://github.com/traefik/traefik
- https://github.com/traefik/traefik/releases/tag/v2.11.43
- https://github.com/traefik/traefik/releases/tag/v3.6.14
- https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2
CVE-2026-39858 · published · modified · JSON
Go/github.com/traefik/traefik CVE-2026-39858: critical 10
Traefik: Pre-authentication decision bypass due to forwarded alias spoofing
Action: No fix published. Pin and monitor.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | - | 1.7.34 |
Fixed versions
No fixed version in the source.
Sources
- osv: GHSA-5m6w-wvh7-57vm#Go/github.com/traefik/traefik
- https://github.com/traefik/traefik/security/advisories/GHSA-5m6w-wvh7-57vm
- https://nvd.nist.gov/vuln/detail/CVE-2026-39858
- https://github.com/traefik/traefik
- https://github.com/traefik/traefik/releases/tag/v2.11.43
- https://github.com/traefik/traefik/releases/tag/v3.6.14
- https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2
CVE-2026-39858 · published · modified · JSON
Go/github.com/traefik/traefik CVE-2026-39858: unknown
Traefik: Pre-authentication decision bypass due to forwarded alias spoofing in github.com/traefik/traefik
Action: No fix published. Pin and monitor.
Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | - | - |
Fixed versions
No fixed version in the source.
Sources
- osv: GO-2026-5149
- https://github.com/traefik/traefik/security/advisories/GHSA-5m6w-wvh7-57vm
- https://nvd.nist.gov/vuln/detail/CVE-2026-39858
- https://github.com/traefik/traefik/releases/tag/v2.11.43
- https://github.com/traefik/traefik/releases/tag/v3.6.14
- https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2
CVE-2026-39858 · published · modified · JSON
Go/github.com/traefik/traefik/v2 CVE-2026-39858: unknown
Traefik: Pre-authentication decision bypass due to forwarded alias spoofing in github.com/traefik/traefik
Action: Upgrade github.com/traefik/traefik/v2 to 2.11.43 or later.
go get github.com/traefik/traefik/v2@v2.11.43Affected
| introduced | fixed | last affected |
|---|---|---|
| 0 | 2.11.43 | - |
Fixed versions
| 2.11.43 |
Sources
- osv: GO-2026-5149#Go/github.com/traefik/traefik/v2
- https://github.com/traefik/traefik/security/advisories/GHSA-5m6w-wvh7-57vm
- https://nvd.nist.gov/vuln/detail/CVE-2026-39858
- https://github.com/traefik/traefik/releases/tag/v2.11.43
- https://github.com/traefik/traefik/releases/tag/v3.6.14
- https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2
CVE-2026-39858 · published · modified · JSON
Go/github.com/traefik/traefik/v3 CVE-2026-39858: unknown
Traefik: Pre-authentication decision bypass due to forwarded alias spoofing in github.com/traefik/traefik
Action: Upgrade github.com/traefik/traefik/v3 to 3.6.14 or later.
go get github.com/traefik/traefik/v3@v3.6.14go get github.com/traefik/traefik/v3@v3.7.0-rc.2Affected
| introduced | fixed | last affected |
|---|---|---|
| 3.0.0-beta1 | 3.6.14 | - |
| 3.7.0-ea.1 | 3.7.0-rc.2 | - |
Fixed versions
| 3.6.14 | 3.7.0-rc.2 |
Sources
- osv: GO-2026-5149#Go/github.com/traefik/traefik/v3
- https://github.com/traefik/traefik/security/advisories/GHSA-5m6w-wvh7-57vm
- https://nvd.nist.gov/vuln/detail/CVE-2026-39858
- https://github.com/traefik/traefik/releases/tag/v2.11.43
- https://github.com/traefik/traefik/releases/tag/v3.6.14
- https://github.com/traefik/traefik/releases/tag/v3.7.0-rc.2
CVE-2026-39858 · published · modified · JSON