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CVE-2026-82522— libjxl < 0.12.0 Container Box Parser Integer Underflow via 32-bit Size Truncation

Quick assessment

Affected
libjxl libjxl
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.

libjxl 0.12 之前的版本中，容器盒（container box）解析器存在一个整数下溢（integer underflow）漏洞。在 32 位平台上，64 位盒尺寸（box size）被截断为 时会发生下溢，远程攻击者可利用该特性注入任意元数据。攻击者可通过提供经过构造的 JPEG XL 文件，使解码器将攻击者控制的码流（codestream）字节误解析为“幻影”盒（phantom box）头，从而实现任意元数据（Exif、XMP、IPTC、JUMBF 等）的注入，并可能引发越界读取（out-of-bou

CVSS 5.4 · Medium
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I. Basic Information for CVE-2026-82522

Vulnerability Information
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Vulnerability Title
libjxl < 0.12.0 Container Box Parser Integer Underflow via 32-bit Size Truncation
Source: CVE Program / CVE List V5
Vulnerability Description
libjxl before 0.12 contains an integer underflow vulnerability in the container box parser that allows remote attackers to inject arbitrary metadata by exploiting 64-bit box size truncation to size_t on 32-bit platforms. Attackers can supply a crafted JPEG XL file causing the decoder to parse attacker-controlled codestream bytes as phantom box headers, enabling injection of arbitrary metadata (Exif, XMP, IPTC, JUMBF) and potential out-of-bounds reads.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
数值类型间的不正确转换
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
libjxl libjxl 0 ~ 0.12.0 -

II. Public POCs for CVE-2026-82522

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III. Intelligence Information for CVE-2026-82522

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Patches & Fixes for CVE-2026-82522 (2)

Vendor Advisories for CVE-2026-82522 (1)

Vendor Pages for CVE-2026-82522 (1)

IV. Related Vulnerabilities

Same product: libjxl
Same vendor: libjxl
Same weakness: CWE-681

V. Comments for CVE-2026-82522

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