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%CVSS: 5.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
5.3(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: Track

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%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
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.
github Patch Available

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 rangeFixed inDependents
nitro—3.0.260429-beta—
nitropack—2.13.4—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 43× 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 128 total refreshes for this CVE.

  1. 2026-08-26 14:46 UTCEPSS rescore
  2. 2026-08-25 13:49 UTCEPSS rescore
  3. 2026-08-23 17:49 UTCEG score recompute
  4. 2026-08-23 00:19 UTCEPSS rescore
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  12. 2026-08-17 10:29 UTCEG score recompute
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  25. 2026-08-09 13:46 UTCEPSS rescore
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  1. 2026-08-09 05:15 UTCEG score recompute
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  5. 2026-08-06 13:46 UTCEPSS rescore
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  25. 2026-07-23 03:15 UTCEG score recompute
  26. 2026-07-22 14:08 UTCEPSS rescore
  27. 2026-07-21 15:24 UTCEPSS rescore
  28. 2026-07-20 17:08 UTCEPSS rescore
  29. 2026-07-19 14:31 UTCEPSS rescore
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  31. 2026-07-18 10:04 UTCEPSS rescore
  32. 2026-07-18 02:29 UTCOSV refresh
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  42. 2026-07-07 13:46 UTCEPSS rescore
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  72. 2026-06-10 22:18 UTCEPSS rescore
  73. 2026-06-10 13:22 UTCEPSS rescore
  74. 2026-06-10 13:22 UTCEPSS rescore
  75. 2026-06-08 14:17 UTCEPSS rescore

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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 in the National Vulnerability Database 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% probability of exploitation in the next 30 days, which ranks it in the top 67.9% of all 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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-44373, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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