CVE-2025-54803
In versions below 1.0.2, a prototype pollution vulnerability in js-toml allows a remote attacker to add or modify properties of the global Object.prototype by parsing a maliciously crafted TOML input.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.50%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
js-toml is a TOML parser for JavaScript, fully compliant with the TOML 1.0.0 Spec. In versions below 1.0.2, a prototype pollution vulnerability in js-toml allows a remote attacker to add or modify properties of the global Object.prototype by parsing a maliciously crafted TOML input. This is fixed in version 1.0.2.
- CVSS 4.0
- 7.9 HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
- EPSS
- 0.50% probability · 41th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-1321
- Affected
- sunnyadn/js-toml
- Source
- security-advisories@github.com
References
- https://gist.github.com/siunam321/f3dc4d21a5a932c67b6c11d0026f5afcExploit
- https://github.com/sunnyadn/js-toml/commit/b125910a3f094b744c9c3571360d4b9e3a472f66Patch
- https://github.com/sunnyadn/js-toml/security/advisories/GHSA-65fc-cr5f-v7r2Vendor Advisory
- https://gist.github.com/siunam321/f3dc4d21a5a932c67b6c11d0026f5afcExploit
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.