CVE-2026-93749

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-09-18. a secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

source-map-js through 1.2.1 fails to validate the per-section offset line value in indexed source maps, allowing attackers to specify arbitrary numeric values. Attackers can supply extremely large offset line values that cause synchronous event loop blocking for extended periods, preventing the service from handling other requests.

CVSS v3
7.5
EG Score
7.5(high)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
29%
KEV
Not listed

Published

September 18, 2026

Last Modified

September 18, 2026

Advisory Details (4)

Auto-updated Sep 18, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic

source-map-js through 1.2.1 Event Loop Denial of Service | Advisories | VulnCheck

https://www.vulncheck.com/advisories/source-map-js-through-1.2.1-event-loop-denial-of-service
generic🟡 PoC Available

Security Advisory: Event-loop denial of service in SourceNode via unvalidated section offset line · Issue #76 · 7rulnik/source-map-js · GitHub

https://github.com/7rulnik/source-map-js/issues/76
generic

source-map-js/lib/source-node.js at c1cd8904bb7bd0c7fb5879fcda48134d82a27934 · 7rulnik/source-map-js · GitHub

https://github.com/7rulnik/source-map-js/blob/c1cd8904bb7bd0c7fb5879fcda48134d82a27934/lib/source-node.js#L115-L118
generic

GitHub - 7rulnik/source-map-js: Consume and generate source maps. · GitHub

https://github.com/7rulnik/source-map-js

Vendor Advisories for CVE-2026-93749(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 7× 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.

  1. 2026-09-19 19:07 UTCEG score recompute
  2. 2026-09-19 19:07 UTCGHSA enrichment
  3. 2026-09-19 06:49 UTCEG score recompute
  4. 2026-09-19 06:48 UTCGHSA enrichment
  5. 2026-09-18 18:27 UTCEG score recompute
  6. 2026-09-18 17:54 UTCEG score recompute
  7. 2026-09-18 17:54 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-93749?
CVE-2026-93749 is a high vulnerability published on September 18, 2026. source-map-js through 1.2.1 fails to validate the per-section offset line value in indexed source maps, allowing attackers to specify arbitrary numeric values. Attackers can supply extremely large offset line values that cause synchronous event loop blocking for extended periods, preventing the…
When was CVE-2026-93749 disclosed?
CVE-2026-93749 was first published in the National Vulnerability Database on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-93749 actively exploited?
CVE-2026-93749 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 71.3% of all scored CVEs.
What is the CVSS score of CVE-2026-93749?
CVE-2026-93749 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-93749?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-93749, 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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-93749

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