CVE-2026-44373: Nitro is a next generation server toolkit

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-44373 is a medium-severity flaw (CVSS 5.3) affecting nitro. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Nitro is a next generation server toolkit. Prior to 3.0.260429-beta, an attacker could bypass a proxy route rule by sending percent-encoded path traversal (..%2f) in the URL, causing Nitro to forward a request that the upstream resolved outside the configured scope. This vulnerability is fixed in 3.0.260429-beta.

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 61%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-05-13
Last modified	2026-10-26

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

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

Am I affected?

Timeline

2026-05-13 21:16 UTCPublished CVE record published
2026-10-26 17:10 UTCUpdated Record last modified

nitro nitro UPGRADE

Affected: < 2.13.4 · > 2.13.4 and < 3.0.260429

Fixed in: 2.13.4, 3.0.260429

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls nitro

2. UPGRADE to 2.13.4

npm install nitro@">=2.13.4"

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-2026-44373?

nitro: upgrade to 2.13.4, 3.0.260429. Exact commands for each OS are on this page.

Is CVE-2026-44373 being exploited?

CVE-2026-44373 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-2026-44373 affect?

CVE-2026-44373 affects nitro. Severity is medium (CVSS 5.3). Nitro is a next generation server toolkit. Prior to 3.0.260429-beta, an attacker could bypass a proxy route rule by sending percent-encoded path traversal (..%2f) in the URL, causing Nitro to forward a request that the upstream resolved out

How urgent is CVE-2026-44373?

Priority 33/100. Remotely exploitable, no login, no user action

Related CVEs

CVE-2026-44372 MEDIUM 6.1 UPGRADE Nitro is a next generation server toolkit

References

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