Low [CVE-2026-63376] Arbitrary Code Execution via Prototype Pollution in TOML Parsing
This low-severity Red Hat Linux advisory covers CVE-2026-63376 affecting Red Hat Enterprise Linux 10, Red Hat package: cockpit-image-builder.
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Summary
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.
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.
Red Hat severity: Low — CVSS 3.7 (CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:L/A:L). Weakness: CWE-915.
Affected Red Hat products: Red Hat Enterprise Linux 10. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: cockpit-image-builder.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation checklist
- No mitigation is available for this vulnerability.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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