CVE-2026-63376
Description
A flaw was found in toml-node, a software library used for parsing TOML (Tom's Obvious, Minimal Language) files in Node.js and web applications. A remote attacker could exploit a vulnerability known as prototype pollution by providing specially crafted TOML input. This could allow the attacker to inject properties into fundamental JavaScript objects, potentially leading to arbitrary code execution, denial of service, or bypassing security controls within the affected application.
Statement
The toml npm package is bundled in cockpit-image-builder, where the vulnerable TOML parser is only invoked client-side when an authenticated user manually uploads a blueprint file. While prototype pollution of Object.prototype is possible via crafted TOML input, exploitation requires an application-specific gadget to escalate beyond the pollution itself. No such gadget has been identified in cockpit-image-builder's React/PatternFly frontend. Red Hat rates this as Low impact.
Mitigation
No mitigation is available for this vulnerability.
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).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 3.7 | N/A | 8.2 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | High | N/A | Low |
| Privileges Required | Low | N/A | None |
| User Interaction | Required | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | Low | N/A | High |
| Availability Impact | Low | N/A | Low |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:L
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Application Data
An attacker could modify sensitive data or program variables.
Integrity
Technical Impact: Execute Unauthorized Code or Commands
Other,Integrity
Technical Impact: Varies by Context; Alter Execution Logic
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