{"cve":"CVE-2026-49293","nvd":{"published":"2026-06-19T19:16:36.297","modified":"2026-10-25T23:10:00.167","status":"Analyzed","description":"js-toml is a TOML parser for JavaScript, fully compliant with the TOML 1.0.0 Spec. Versions up to and including 1.1.0 parse hexadecimal / octal / binary integer literals via a hand-written `parseBigInt` loop that multiplies a `BigInt` accumulator by the radix once per input digit. Each iteration performs a `BigInt * BigInt` operation on an accumulator that grows linearly with the number of digits already consumed, so the whole loop is O(n²) in the literal length. The lexer regex places no upper bound on the literal length, so a single TOML document containing one ~500 kB hex literal pins one CPU core for ~40 seconds on a modern laptop (Apple M-series, Node v22). Memory amplification is bounded but CPU amplification is severe and grows quadratically: doubling the literal length quadruples the work. A caller that invokes `load()` on attacker-controlled TOML (configuration upload endpoints, CI/CD systems ingesting third-party `*.toml`, IDE plugins, build tools) is exposed to a single-request CPU exhaustion DoS. Version 1.1.1 fixes the issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-400","CWE-407","CWE-1333"],"references":["https://github.com/sunnyadn/js-toml/commit/1abcb31dc7b1fa88e4c848a8d108891cfbb96fa2","https://github.com/sunnyadn/js-toml/releases/tag/v1.1.1","https://github.com/sunnyadn/js-toml/security/advisories/GHSA-wp3c-266w-4qfq","https://github.com/sunnyadn/js-toml/security/advisories/GHSA-wp3c-266w-4qfq"],"products":["sunnyadn:js-toml"],"source":"nvd","synced_at":"2026-10-25T23:44:33.281319194+00:00"},"epss":{"cve":"CVE-2026-49293","score":0.00644,"percentile":0.5057,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-wp3c-266w-4qfq","url":"https://osv.dev/vulnerability/GHSA-wp3c-266w-4qfq","summary":"js-toml vulnerable to CPU exhaustion via O(n^2) BigInt construction on radix-prefixed integer literals","modified":"2026-06-26T22:41:27.037839Z","packages":[{"ecosystem":"npm","name":"js-toml","purl":"pkg:npm/js-toml","ranges":["<1.1.1"],"fixed":["1.1.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}