CVE-2026-120452— libgphoto2 through 2.5.34 Heap Out-of-Bounds Read/Write via jl2005c Thumbnail Conversion

Quick assessment

Affected

gPhoto libgphoto2

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.

libgphoto2 2.5.34 及更早版本在 jl2005bcd_decompress() 函数中存在堆越界读取和写入漏洞。该漏洞允许恶意的 USB 相机通过处理过大的缩略图来破坏堆内存。攻击者可提供较小的分配表值及缩略图头字节，致使原地字节交换操作超出缓冲区约 30 KB，从而在预览图像中泄露堆内存内容。

CVSS 5.4 · Medium EPSS 0.18% · P8 Updated Nov 03, 2026

Possible ATT&CK Techniques 2 AI

T1068 · Exploitation for Privilege Escalation T1203 · Exploitation for Client Execution

Affected Version Matrix 1

Vendor	Product	Version Range	Status
gPhoto	libgphoto2	`≤ 2.5.34`	affected

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Vulnerability Information

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Vulnerability Title

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

Source: CVE Program / CVE List V5

Vulnerability Description

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.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

跨界内存写

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
gPhoto	libgphoto2	0 ~ 2.5.34	-

II. Public POCs for CVE-2026-120452

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-120452

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Other References for CVE-2026-120452 (6)

https://github.com/gphoto/libgphoto2/blob/v2.5.34/camlibs/jl2005c/jl2005bcd_decompress.c#L127-L130 technical-description
https://hackmd.io/@haindpwn/libgphoto2-jl2005c-init-alloc-table-buffer-overflow technical-description
https://github.com/gphoto/libgphoto2/commit/30bf7ace6d47cfe1232ea73bde2aceb95aba4bfb patch
https://github.com/gphoto/libgphoto2/issues/1326 issue-tracking
https://github.com/gphoto/libgphoto2/commit/af3b8e9c542cda863fb5f2f3cfeb261bd78e4442 patch
https://www.vulncheck.com/advisories/libgphoto2-through-2.5.34-heap-out-of-bounds-read-write-via-jl2005c-thumbnail-conversion third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-120452

IV. Related Vulnerabilities

Same product: libgphoto2

Same vendor: gPhoto

Same weakness: CWE-787