CVE-2026-65600: Traefik versions <= v2.11.51, >= v3.6.0 <= v3.6.22, and >= v3.7.0 <= v3.7.6 contain an authentication bypass v

Q: How do I fix CVE-2026-65600?

traefik: upgrade to 2.11.52, 3.6.23, 3.7.7. Exact commands for each OS are on this page.

Q: Is CVE-2026-65600 being exploited?

CVE-2026-65600 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-65600 affect?

CVE-2026-65600 affects traefik. Severity is medium (CVSS 5.3). Traefik versions = v3.6.0 = v3.7.0 <= v3.7.6 contain an authentication bypass via path traversal in the ReplacePathRegex middleware. When ReplacePathRegex is configured with a regex that captures user-controll

Q: How urgent is CVE-2026-65600?

Priority 36/100. Remotely exploitable, no login, no user action

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-65600 is a medium-severity flaw (CVSS 5.3) affecting traefik. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Traefik versions <= v2.11.51, >= v3.6.0 <= v3.6.22, and >= v3.7.0 <= v3.7.6 contain an authentication bypass via path traversal in the ReplacePathRegex middleware. When ReplacePathRegex is configured with a regex that captures user-controlled path segments without a mandatory path separator (e.g. regex "^/api(.*)", replacement "/$1"), the middleware forwards the replaced path to the backend without validating that it matches its normalized form.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.6% (top 51%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-07-22
Last modified	2026-10-24

Publisher (CNA): VulnCheck · Vendor: traefik

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-22 12:18 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

traefik traefik UPGRADE

Affected: < 2.11.52 · >= 3.6.0 and < 3.6.23 · >= 3.7.0 and < 3.7.7

Fixed in: 2.11.52, 3.6.23, 3.7.7

Safe to downgrade to: a release before 3.6.0

1. Check installed version

apt-cache policy traefik || rpm -q traefik || traefik --version

2. UPGRADE to 2.11.52 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade traefik

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade traefik

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 3.6.0 (Debian / Ubuntu)

apt-cache madison traefik sudo apt install traefik=<VERSION_BEFORE_3.6.0> sudo apt-mark hold traefik

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list traefik sudo dnf downgrade traefik-<VERSION_BEFORE_3.6.0> sudo dnf versionlock add traefik

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

Go · github.com/traefik/traefik/v2 · FIXED · 2.11.52 · vulnerable: <= 2.11.51 · source

go get github.com/traefik/traefik/v2@v2.11.52 go list -m github.com/traefik/traefik/v2

Go · github.com/traefik/traefik/v3 · FIXED · 3.6.23 · vulnerable: <= 3.6.22 · source

go get github.com/traefik/traefik/v3@v3.6.23 go list -m github.com/traefik/traefik/v3

Go · github.com/traefik/traefik · NO FIX YET · vulnerable: <= 1.7.34 · source

Fedora 46 · sugar-toolkit-gtk3 · FIXED · 0.122-2.fc46 · FEDORA-2026-d11eb2faf0 · source

sudo dnf upgrade --advisory=FEDORA-2026-d11eb2faf0

Fedora ELN · ntpd-rs · FIXED · 1.7.2-3.eln159 · FEDORA-2026-57e4a99310 · source

sudo dnf upgrade --advisory=FEDORA-2026-57e4a99310

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/traefik/traefik/security/advisories/GHSA-cxjq-mrr5-89rv

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-65600?

traefik: upgrade to 2.11.52, 3.6.23, 3.7.7. Exact commands for each OS are on this page.

Is CVE-2026-65600 being exploited?

CVE-2026-65600 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-65600 affect?

CVE-2026-65600 affects traefik. Severity is medium (CVSS 5.3). Traefik versions <= v2.11.51, >= v3.6.0 <= v3.6.22, and >= v3.7.0 <= v3.7.6 contain an authentication bypass via path traversal in the ReplacePathRegex middleware. When ReplacePathRegex is configured with a regex that captures user-controll

How urgent is CVE-2026-65600?

Priority 36/100. Remotely exploitable, no login, no user action

Software pages

Traefik vulnerabilities

Related CVEs

CVE-2026-112778 HIGH 8.8 UPGRADE Traefik before 2.11.46, 3.x before 3.6.17, and 3.7.0 lack namespace validation for Ingress and Service annotat

References

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