CVE-2026-120452

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CVE-2026-120452

Summary: libgphoto2 through 2.5.34 Heap Out-of-Bounds Read/Write via jl2005c Thumbnail Conversion

Details: libgphoto2 through 2.5.34 contains a heap out-of-bounds read and write vulnerability in jl2005bcd_decompress() that allows malicious USB cameras to corrupt heap memory via oversized thumbnail processing. Attackers can supply small allocation-table values and a thumbnail header byte so in-place byte-swapping exceeds the buffer by about 30 KB, leaking heap contents in preview images.

References: https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/120xxx/CVE-2026-120452.json, https://nvd.nist.gov/vuln/detail/CVE-2026-120452, https://www.vulncheck.com/advisories/libgphoto2-through-2.5.34-heap-out-of-bounds-read-write-via-jl2005c-thumbnail-conversion, https://github.com/gphoto/libgphoto2/issues/1326, https://github.com/gphoto/libgphoto2/commit/30bf7ace6d47cfe1232ea73bde2aceb95aba4bfb, https://github.com/gphoto/libgphoto2/commit/af3b8e9c542cda863fb5f2f3cfeb261bd78e4442, https://github.com/gphoto/libgphoto2, https://github.com/gphoto/libgphoto2/blob/v2.5.34/camlibs/jl2005c/jl2005bcd_decompress.c#L127-L130, https://hackmd.io/@haindpwn/libgphoto2-jl2005c-init-alloc-table-buffer-overflow