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source-map-js CVE-2026-93749

| EUVDEUVD-2026-83254 HIGH
Improper Validation of Specified Quantity in Input (CWE-1284)
2026-09-18 VulnCheck GHSA-68fv-2mgg-jv7q
Node.js Red Hat Suse Source Map Js
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
5.9 MEDIUM

Remote unauthenticated DoS, but AC:H because it depends on the app parsing attacker-controlled indexed source maps; pure availability impact so C:N/I:N/A:H.

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat
7.5 HIGH
qualitative

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

5
POC Analysis Generated
Oct 08, 2026 - 11:22 vuln.today
Metadata Corrected
Sep 18, 2026 - 18:40 vuln.today
tag: Node.js added
Metadata Corrected
Sep 18, 2026 - 18:40 vuln.today
tag: Information Disclosure Denial Of Service
Analysis Generated
Sep 18, 2026 - 18:25 vuln.today
CVE Published
Sep 18, 2026 - 17:51 cve.org
HIGH 8.7

DescriptionCVE.org

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.

AnalysisAI

Denial of service in source-map-js up to and including 1.2.1 allows an attacker who can supply an indexed source map to hang the Node.js process: the library reads the per-section offset.line value without bounds checking, so an arbitrarily large integer forces a long synchronous loop that blocks the event loop and starves all other requests. The flaw (CWE-1284, improper validation of a specified quantity) is reachable only where a service actually parses attacker-controlled maps - for example an online transpiler, upload-accepting bundler service, or error/stack-trace resolver - since source maps are normally trusted build-time artifacts; the assessed CVSS 3.1 vector (AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H) reflects that data-flow prerequisite, and no public exploit was identified at time of analysis. …

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Attack ChainAIDerived

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Vulnerability AssessmentAI

Exploitation Exploitation requires the target application to parse an attacker-controlled INDEXED source map (a map containing a 'sections' array) through source-map-js's SourceNode code path (source-node.js L115-118), where the per-section offset.line value is accepted without bounds validation. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a pure availability/denial-of-service issue (CVSS 4.0 vector VC:N/VI:N/VA:H, CWE-1284 improper validation of a specified quantity), not information disclosure despite the 'Information Disclosure' tag. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation No vendor-released patch was identified at time of analysis, so treat the upstream issue https://github.com/7rulnik/source-map-js/issues/76 and the advisory https://www.vulncheck.com/advisories/source-map-js-through-1.2.1-event-loop-denial-of-service as the authoritative trackers and move to a version above 1.2.1 as soon as one ships. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, audit all systems using source-map-js up to and including 1.2.1 to identify any that process attacker-controlled source maps; if found, immediately restrict access or disable parsing of external maps. …

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Micro 5.3 Affected
SUSE Linux Enterprise Micro 5.3 Affected
SUSE Linux Enterprise Micro 5.3 Affected
SUSE Linux Enterprise Micro 5.3 Affected

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CVE-2026-93749 vulnerability details – vuln.today
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