CVE catalog
CVE-2026-93749
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 off
- Severity
- High · CVSS 8.7
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 - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.46% · Oct 27, 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 service from handling other requests.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | node-postcss | sid | 8.5.31+~cs10.2.26-1 | fixed |
| Debian | node-postcss | forky | 8.5.31+~cs10.2.26-1 | fixed |
| Debian | node-postcss | trixie | 8.4.49+~cs9.2.32-1 | vulnerable |
| Debian | node-postcss | bookworm | 8.4.20+~cs8.0.23-1+deb12u1 | vulnerable |
| Npm | source-map-js | Not reported | 1.2.2 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | node-postcss | source | sid | 8.5.31+~cs10.2.26-1 | not yet assigned | Not reported | [1148404] |
| Debian | node-postcss | source | forky | 8.5.31+~cs10.2.26-1 | not yet assigned | Not reported | [1148404] |
| Debian | node-postcss | source | trixie | (unfixed) | not yet assigned | Not reported | [1148404] |
| Debian | node-postcss | source | bookworm | (unfixed) | not yet assigned | Not reported | [1148404] |
| Npm | source-map-js | npm | Not reported | 1.2.2 | Not reported | GHSA-68FV-2MGG-JV7Q | Not reported |
Notes
[trixie] node-postcss: Minor issue [bookworm] node-postcss: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [node-postcss]Affected
Details (2)
8.4.20+~cs8.0.23-1+deb12u1· all · bookwormAffected
nvd · node-postcss · debian · bookworm; nvd · node-postcss · debian · 12
8.4.20+~cs8.0.23-1+deb12u1· all · bookwormAffected
nvd · node-postcss · debian · bookworm; nvd · node-postcss · debian · 12
[Debian 13 (Trixie)]
- [node-postcss]Affected
Details (2)
8.4.49+~cs9.2.32-1· all · trixieAffected
nvd · node-postcss · debian · 13
8.4.49+~cs9.2.32-1· all · trixieAffected
nvd · node-postcss · debian · 13
Observed:
References
- [https://access.redhat.com/errata/RHSA-2026:79357]
- [https://ftp.suse.com/pub/projects/security/]
- [https://github.com/advisories/GHSA-68fv-2mgg-jv7q]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-93749]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-93749]
- [https://security-tracker.debian.org/tracker/CVE-2026-93749]
[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]