FLVMeta up to 1.2.2 AMF String Processing src/amf.c amf_string_new length heap-based overflow

Summaryinfo

A vulnerability was found in FLVMeta up to 1.2.2. It has been rated as problematic. Affected by this vulnerability is the function amf_string_new of the file src/amf.c of the component AMF String Processing. This manipulation of the argument length causes heap-based overflow. This vulnerability appears as CVE-2026-82820. The attack may be initiated remotely. In addition, an exploit is available. To fix this issue, it is recommended to deploy a patch. The project maintainer doubts the security impact: "While I acknowledged the bugs and provided fixes, I have yet to see any way to exploit these alleged vulnerabilities."

Detailsinfo

A vulnerability classified as problematic was found in FLVMeta up to 1.2.2. Affected by this vulnerability is the function amf_string_new of the file src/amf.c of the component AMF String Processing. The manipulation of the argument length with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect availability.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-82820. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details and also a public exploit are known.

It is possible to download the exploit at github.com. It is declared as proof-of-concept. The project maintainer doubts the security impact: "While I acknowledged the bugs and provided fixes, I have yet to see any way to exploit these alleged vulnerabilities."

Applying the patch f412a33b9a84c2d1a9dee145a868feddbf64879e is able to eliminate this problem. The bugfix is ready for download at github.com.

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Productinfo

Name

• FLVMeta

Version

• 1.2.0
• 1.2.1
• 1.2.2

License

• open-source

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

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Submitinfo

Accepted

• Submit #876596: flvmeta 1.2.2 Heap-based Buffer Overflow (by Raind)

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