CVE-2026-92454 JPEG decoder: truncated segments are read past the image buffer, and a zero sampling factor hangs the decode

The GUIX software JPEG decoder reads four kinds of marker segment without checking that each is long enough to hold what it reads. A truncated segment is therefore read past the end of the caller's image buffer. Separately, a zero chroma sampling factor makes the block decode loop non-terminating...

CVE-2026-92454

The GUIX software JPEG decoder is vulnerable to an out-of-bounds read and a non-terminating loop when GX_SOFTWARE_DECODER_SUPPORT is enabled. The decoder fails to verify that four kinds of marker segments are long enough, causing truncated segments to be read past the end of the caller's image bu...