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CVE-2026-104266— tinytag: Infinite loop when parsing certain M4A files containing invalid atoms

Quick assessment

Affected
tinytag tinytag
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

tinytag 是一个用于读取音频文件元数据的 Python 库。在版本 2.0.0 至 2.3.0 中，一个包含大小为 0 的子原子（sub-atom）的 M4A 文件（该子原子位于 ---- 原子内部）会导致元数据解析器在遍历输入数据时停止前进。对自定义字段原子的遍历会反复处理这个畸形位置，从而导致无限循环，并导致读取该构造文件的程序出现拒绝服务（Denial of Service）问题。该问题已在版本 2.3.0 中修复。

CVSS 6.5 · Medium EPSS 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
tinytag tinytag >= 2.0.0, < 2.3.0 affected
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I. Basic Information for CVE-2026-104266

Vulnerability Information
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Vulnerability Title
tinytag: Infinite loop when parsing certain M4A files containing invalid atoms
Source: CVE Program / CVE List V5
Vulnerability Description
tinytag is a Python library for reading audio file metadata. From 2.0.0 until 2.3.0, an M4A file containing a sub-atom with a size of zero inside a ---- atom can cause the metadata parser to stop advancing through the input. The custom-field atom traversal repeatedly processes the malformed location, causing an infinite loop and denying service to a program that reads the crafted file. This issue is fixed in version 2.3.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
tinytag tinytag >= 2.0.0, < 2.3.0 -

II. Public POCs for CVE-2026-104266

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III. Intelligence Information for CVE-2026-104266

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Patches & Fixes for CVE-2026-104266 (2)

Vendor Advisories for CVE-2026-104266 (1)

Vendor Pages for CVE-2026-104266 (1)

IV. Related Vulnerabilities

Same product: tinytag
Same vendor: tinytag
Same weakness: CWE-835

V. Comments for CVE-2026-104266

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