CVE-2026-44373

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 67% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 5.3Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
40
EG Risk 40/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation40% × 40%
Automatability0% × 15%
EPSS PROB
0.6%
EPSS %ILE
45th
KEV
Not listed

Published

May 13, 2026

Last Modified

May 28, 2026

Advisory Details (5)

Auto-updated Jun 16, 2026
Patch available. Sources: github_pr, github_release, github.
githubMentions a patch (unverified)

Proxy scope bypass via percent-encoded path traversal in `routeRules` · Advisory · nitrojs/nitro · GitHub

https://github.com/nitrojs/nitro/security/advisories/GHSA-5w89-w975-hf9q
github_release Patch Available

v3.0.260429-beta

Patch available: nitrojs/nitro v3.0.260429-beta

https://github.com/nitrojs/nitro/releases/tag/v3.0.260429-beta
github_release Patch Available

v2.13.4

Patch available: nitrojs/nitro v2.13.4

https://github.com/nitrojs/nitro/releases/tag/v2.13.4
github_pr

fix(route-rules): reject out-of-scope requests

Fix merged in nitrojs/nitro PR #4223 on 2026-04-22 — awaiting tagged release

https://github.com/nitrojs/nitro/pull/4223
github_pr Patch Available

fix(route-rules): reject out-of-scope requests

Patch available: nitrojs/nitro v2.13.4 (PR #4222 merged 2026-04-22)

https://github.com/nitrojs/nitro/pull/4222

Affected Packages

(2 across 1 ecosystem)
npm(2)
PackageVulnerable rangeFix by version rangeDependents
nitro—
  • every version up to 3.0.260429-beta: fixed in 3.0.260429-beta
—
nitropack—
  • every version up to 2.13.4: fixed in 2.13.4
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 24× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 163 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:12 UTCEPSS rescore
  4. 2026-10-07 23:48 UTCEPSS rescore
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  1. 2026-09-08 22:00 UTCEPSS rescore
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  22. 2026-08-17 10:29 UTCEG score recompute
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  40. 2026-08-06 13:46 UTCEPSS rescore
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  42. 2026-08-05 19:17 UTCEPSS rescore
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  45. 2026-08-03 23:35 UTCEG score recompute
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  50. 2026-08-01 04:16 UTCEPSS rescore
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  67. 2026-07-18 02:29 UTCOSV refresh
  68. 2026-07-16 17:03 UTCEPSS rescore
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  73. 2026-07-12 05:46 UTCEPSS rescore
  74. 2026-07-11 08:27 UTCEPSS rescore
  75. 2026-07-09 19:10 UTCEPSS rescore

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npm:nitro

Frequently asked(5)

What is CVE-2026-44373?
CVE-2026-44373 is a medium vulnerability published on May 13, 2026. 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…
When was CVE-2026-44373 disclosed?
CVE-2026-44373 was first published on May 13, 2026, with the most recent update on May 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-44373 actively exploited?
CVE-2026-44373 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (45th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-44373?
CVE-2026-44373 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-44373?
A fix for CVE-2026-44373 is available: update to the fixed version the vendor names in its advisory.

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