CVE-2026-93749
Description
A flaw was found in source-map-js. This vulnerability allows a remote attacker to trigger a denial of service by providing malformed input. Specifically, by supplying extremely large offset line values in indexed source maps, the attacker can cause the service's event loop to block, making it unable to process further requests.
Statement
This vulnerability is rated as Important because an unauthenticated remote attacker can supply crafted data that synchronously blocks the single-threaded event loop, resulting in a sustained denial of service for affected services. In standard Red Hat application environments, source map parsing utilities are predominantly utilized in build systems or developer tooling rather than production-facing services, which limits general exposure. However, server-side applications accepting and processing untrusted source maps from external clients are directly susceptible to availability disruption.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.5 | N/A | 7.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
