CVE-2026-15074: @fastify/static up to and including version 10.1.0 fails to reject dot-dot path segments in request pathnames

Q: How do I fix CVE-2026-15074?

fastify-static: upgrade to 10.1.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-15074 being exploited?

CVE-2026-15074 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-2026-15074 affect?

CVE-2026-15074 affects fastify-static. Severity is high (CVSS 7.5). @fastify/static up to and including version 10.1.0 fails to reject dot-dot path segments in request pathnames before the file-resolution stage. This is a bypass of the earlier fix for CVE-2026-6414, which only covered encoded forward slashe

Q: How urgent is CVE-2026-15074?

Priority 44/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-15074 is a high-severity flaw (CVSS 7.5) affecting fastify-static. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

@fastify/static up to and including version 10.1.0 fails to reject dot-dot path segments in request pathnames before the file-resolution stage. This is a bypass of the earlier fix for CVE-2026-6414, which only covered encoded forward slashes. Because the underlying send library normalizes dot segments before applying its own path-traversal guard, an unauthenticated attacker can bypass any route-scoped middleware and read files inside the static r

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-07-23
Last modified	2026-07-28

Publisher (CNA): openjs · Vendor: fastify

Last updated 2026-07-28 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-23 04:16 UTCPublished CVE record published
2026-07-28 17:02 UTCUpdated Record last modified

fastify fastify-static UPGRADE

Affected: < 10.1.1

Fixed in: 10.1.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 10.1.1 (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.

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-2026-15074?

fastify-static: upgrade to 10.1.1. Exact commands for each OS are on this page.

Is CVE-2026-15074 being exploited?

CVE-2026-15074 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-2026-15074 affect?

CVE-2026-15074 affects fastify-static. Severity is high (CVSS 7.5). @fastify/static up to and including version 10.1.0 fails to reject dot-dot path segments in request pathnames before the file-resolution stage. This is a bypass of the earlier fix for CVE-2026-6414, which only covered encoded forward slashe

How urgent is CVE-2026-15074?

Priority 44/100. High severity; Remotely exploitable, no login, no user action

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

References

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