CVE-2026-114635: Traefik before v2.11.58 and v3.7.14 contains an authentication bypass vulnerability in its SNI check, which is

Routine

HIGH 8.7REMOTEUPGRADE

CVE-2026-114635 is a high-severity flaw (CVSS 8.7) affecting traefik. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Traefik before v2.11.58 and v3.7.14 contains an authentication bypass vulnerability in its SNI check, which is skipped when request TLS state is nil. Unauthenticated clients can send HTTP/2 requests with the :scheme http pseudo-header over TLS on Go 1.27 builds to reach routers requiring client certificates without presenting one.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.7 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 90%)
CISA exploited list	No
Weakness	CWE-288
Published	2026-10-22
Last modified	2026-10-27

Publisher (CNA): VulnCheck · Vendor: traefik

Last updated 2026-10-27 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-22 02:16 UTCPublished CVE record published
2026-10-27 14:17 UTCUpdated Record last modified

traefik traefik UPGRADE

Affected: < 2.11.58 · >= 3.0.0 and < 3.7.14

Fixed in: 2.11.58, 3.7.14

Safe to downgrade to: a release before 3.0.0

1. Check installed version

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

2. UPGRADE to 2.11.58 (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 3.0.0 (Debian / Ubuntu)

apt-cache madison traefik sudo apt install traefik=<VERSION_BEFORE_3.0.0> 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_3.0.0> 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.

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-2026-114635?

traefik: upgrade to 2.11.58, 3.7.14. Exact commands for each OS are on this page.

Is CVE-2026-114635 being exploited?

CVE-2026-114635 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-2026-114635 affect?

CVE-2026-114635 affects traefik. Severity is high (CVSS 8.7). Traefik before v2.11.58 and v3.7.14 contains an authentication bypass vulnerability in its SNI check, which is skipped when request TLS state is nil. Unauthenticated clients can send HTTP/2 requests with the :scheme http pseudo-header over

How urgent is CVE-2026-114635?

Priority 38/100. High severity; Remotely exploitable, no login, no user action

Software pages

Traefik vulnerabilities

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References

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