LibJXL up to 0.11.2 APNG Decoder DecodeImageAPNG buffer overflow

Summaryinfo

A vulnerability categorized as problematic has been discovered in LibJXL up to 0.11.2. This impacts the function DecodeImageAPNG of the component APNG Decoder. Such manipulation leads to buffer overflow. This vulnerability is uniquely identified as CVE-2026-52584. Local access is required to approach this attack. No exploit exists.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in LibJXL up to 0.11.2. Affected by this issue is the function DecodeImageAPNG of the component APNG Decoder. The manipulation with an unknown input leads to a buffer overflow vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality. CVE summarizes:

Buffer Overflow vulnerability in libjxl v.0.11.2 and before allows a local attacker to obtain sensitive information via the DecodeImageAPNG function

The advisory is available at github.com. This vulnerability is handled as CVE-2026-52584 since 06/08/2026. The exploitation is known to be easy. Local access is required to approach this attack. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit.

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

Name

• LibJXL

Version

• 0.11.0
• 0.11.1
• 0.11.2

Website

• Product: https://github.com/libjxl/libjxl/

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