CVE-2026-6410: @fastify/static versions 8.0.0 through 9.1.0 allow path traversal when directory listing is enabled via the li

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-6410 is a medium-severity flaw (CVSS 5.3) affecting fastify-static. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

@fastify/static versions 8.0.0 through 9.1.0 allow path traversal when directory listing is enabled via the list option. The dirList.path() function resolves directories outside the configured static root using path.join() without a containment check. A remote unauthenticated attacker can obtain directory listings for arbitrary directories accessible to the Node.js process, disclosing directory and file names. File contents are not disclosed. Upg

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	0.5% (top 57%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-04-16
Last modified	2026-06-17

Publisher (CNA): openjs · Vendor: fastify

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-16 14:16 UTCPublished CVE record published
2026-06-17 11:00 UTCUpdated Record last modified

fastify fastify-static UPGRADE

Affected: >= 8.0.0 and < 9.1.1

Fixed in: 9.1.1

Safe to downgrade to: a release before 8.0.0

1. Check installed version

apt-cache policy fastify-static || rpm -q fastify-static || fastify-static --version

2. UPGRADE to 9.1.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade fastify-static

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade fastify-static

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 8.0.0 (Debian / Ubuntu)

apt-cache madison fastify-static sudo apt install fastify-static=<VERSION_BEFORE_8.0.0> sudo apt-mark hold fastify-static

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

dnf --showduplicates list fastify-static sudo dnf downgrade fastify-static-<VERSION_BEFORE_8.0.0> sudo dnf versionlock add fastify-static

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-2026-6410?

fastify-static: upgrade to 9.1.1. Exact commands for each OS are on this page.

Is CVE-2026-6410 being exploited?

CVE-2026-6410 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-2026-6410 affect?

CVE-2026-6410 affects fastify-static. Severity is medium (CVSS 5.3). @fastify/static versions 8.0.0 through 9.1.0 allow path traversal when directory listing is enabled via the list option. The dirList.path() function resolves directories outside the configured static root using path.join() without a contain

How urgent is CVE-2026-6410?

Priority 34/100. Remotely exploitable, no login, no user action

Software pages

Node.js vulnerabilities

Related CVEs

CVE-2026-18427 HIGH 7.5 UPGRADE @fastify/static before version 10.1.3 contains an incomplete fix for a previous route guard bypass
CVE-2026-7120 MEDIUM 5.3 UPGRADE @fastify/static evaluates the allowedPath callback before normalizing dot segments and duplicate path separato
CVE-2026-15074 HIGH 7.5 UPGRADE @fastify/static up to and including version 10.1.0 fails to reject dot-dot path segments in request pathnames
CVE-2026-6414 MEDIUM 5.9 UPGRADE @fastify/static versions 8.0.0 through 9.1.0 decode percent-encoded path separators (%2F) before filesystem re

References

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