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

Status: published. Published: 2026-11-02. Updated: 2026-11-02.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- gPhoto / libgphoto2: ≥ 0; ≤ 2.5.34 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 5.2 (medium); CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 5.4 (medium); CVSS:3.1/AV:P/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-787

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/gphoto/libgphoto2/issues/1326 (CNA: VulnCheck; issue-tracking)

- https://github.com/gphoto/libgphoto2/commit/af3b8e9c542cda863fb5f2f3cfeb261bd78e4442 (CNA: VulnCheck; patch)

- https://github.com/gphoto/libgphoto2/commit/30bf7ace6d47cfe1232ea73bde2aceb95aba4bfb (CNA: VulnCheck; patch)

- https://github.com/gphoto/libgphoto2/blob/v2.5.34/camlibs/jl2005c/jl2005bcd_decompress.c#L127-L130 (CNA: VulnCheck; technical-description)

- https://hackmd.io/@haindpwn/libgphoto2-jl2005c-init-alloc-table-buffer-overflow (CNA: VulnCheck; technical-description)

- https://www.vulncheck.com/advisories/libgphoto2-through-2.5.34-heap-out-of-bounds-read-write-via-jl2005c-thumbnail-conversion (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-120452; retrieved 2026-11-02; source updated 2026-11-02

Revision: 1057f04222a47b14f9d95686688d8fc5906ae72aea8d9a9eda4e3376888b139f

Canonical: https://y2.dev/cve/CVE-2026-120452

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