Gin-Quin fast-toml up to 0.5.4 buffer overflow

Summaryinfo

A vulnerability classified as critical was found in Gin-Quin fast-toml up to 0.5.4. This issue affects some unknown processing. Executing a manipulation can lead to buffer overflow. This vulnerability is handled as CVE-2021-48012. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Gin-Quin fast-toml up to 0.5.4. It has been declared as critical. This vulnerability affects an unknown function. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect integrity, and availability. CVE summarizes:

fast-toml through 0.5.4 contains a prototype pollution vulnerability that allows attackers to modify Object.prototype by supplying TOML containing __proto__, constructor or prototype key segments. Attackers can pass [__proto__] or [constructor.prototype] table headers or __proto__.x dotted keys to parse() to pollute all objects, causing denial of service or authorization bypass.

The advisory is shared for download at github.com. This vulnerability was named CVE-2021-48012 since 10/12/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/12/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• Gin-Quin

Name

• fast-toml

Version

• 0.5.0
• 0.5.1
• 0.5.2
• 0.5.3
• 0.5.4

Website

• Product: https://github.com/Gin-Quin/fast-toml/

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