CVE-2025-54803
CVE-2025-54803 is a high-severity vulnerability in Sunnyadn Js-toml with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1321.
Key facts
- Severity: High (CVSS 3.x base score 7.5)
- CVSS v4: 7.9
- EPSS exploit prediction: 0% (39th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2025-23575
- Weakness: CWE-1321
- Affected product: Sunnyadn Js-toml
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2025-54803?
- 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.
- How severe is CVE-2025-54803?
- CVE-2025-54803 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
- Is CVE-2025-54803 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (39th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2025-54803?
- CVE-2025-54803 affects Sunnyadn Js-toml. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2025-54803?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- Does CVE-2025-54803 have an EU (EUVD) identifier?
- Yes. CVE-2025-54803 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-23575.
- When was CVE-2025-54803 published?
- CVE-2025-54803 was published on 2025-08-05 and last updated on 2026-06-17.
References
- https://gist.github.com/siunam321/f3dc4d21a5a932c67b6c11d0026f5afc
- https://github.com/sunnyadn/js-toml/commit/b125910a3f094b744c9c3571360d4b9e3a472f66
- https://github.com/sunnyadn/js-toml/security/advisories/GHSA-65fc-cr5f-v7r2
Affected products (1)
- cpe:2.3:a:sunnyadn:js-toml:*:*:*:*:*:node.js:*:*
More vulnerabilities in Sunnyadn Js-toml
- CVE-2026-49293 — High (CVSS 7.5): 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…
All CVEs affecting Sunnyadn Js-toml →
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