Double Free Vulnerability in Nothings stb Multi-frame GIF File Handler

CVE-2026-5186

What is CVE-2026-5186?

A vulnerability has been discovered in Nothings stb, particularly within the Multi-frame GIF File Handler implemented in stb_image.h. This flaw stems from an improper handling of memory that can lead to a double free condition during the execution of the function stbi__load_gif_main. Exploiting this vulnerability necessitates local access and could potentially be leveraged for attacks, given that proof-of-concept exploit code has already been made publicly available. Despite early notification to the vendor regarding this issue, no response has been received.

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