CVE-2026-40910: frp is a fast reverse proxy

This week

MEDIUM 6.5REMOTEUPGRADE

CVE-2026-40910 is a medium-severity flaw (CVSS 6.5) affecting frp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

frp is a fast reverse proxy. From 0.43.0 to 0.68.0, frp contains an authentication bypass in the HTTP vhost routing path when routeByHTTPUser is used as part of access control. In proxy-style requests, the routing logic uses the username from Proxy-Authorization to select the routeByHTTPUser backend, while the access control check uses credentials from the regular Authorization header. As a result, an attacker who can reach the HTTP vhost entrypo

Why this priority

Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 81%)
CISA exploited list	No
Weakness	CWE-287
Published	2026-04-21
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: fatedier

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-21 21:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

fatedier frp UPGRADE

Affected: >= 0.43.0 and < 0.68.1

Fixed in: 0.68.1

Safe to downgrade to: a release before 0.43.0

1. Check installed version

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

2. UPGRADE to 0.68.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade frp

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 0.43.0 (Debian / Ubuntu)

apt-cache madison frp sudo apt install frp=<VERSION_BEFORE_0.43.0> sudo apt-mark hold frp

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

dnf --showduplicates list frp sudo dnf downgrade frp-<VERSION_BEFORE_0.43.0> sudo dnf versionlock add frp

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-2026-40910?

frp: upgrade to 0.68.1. Exact commands for each OS are on this page.

Is CVE-2026-40910 being exploited?

CVE-2026-40910 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-2026-40910 affect?

CVE-2026-40910 affects frp. Severity is medium (CVSS 6.5). frp is a fast reverse proxy. From 0.43.0 to 0.68.0, frp contains an authentication bypass in the HTTP vhost routing path when routeByHTTPUser is used as part of access control. In proxy-style requests, the routing logic uses the username fr

How urgent is CVE-2026-40910?

Priority 37/100. Public exploit reference; Remotely exploitable, no login, no user action

References

← Back to latest CVEs