What is CVE-2026-40339?

CVE-2026-40339 is a medium-severity vulnerability in Gphoto Libgphoto2, classified under Out-of-bounds Read. CVSS score: 5.2/10. Published 2026-04-17.

How severe is CVE-2026-40339?

Medium severity. CVSS v3 base score is 5.2 out of 10.

Out-of-bounds Read in Gphoto Libgphoto2

CVE-2026-40339

libgphoto2 is a camera access and control library. Versions up to and including 2.5.33 have an out-of-bounds read in `ptp_unpack_Sony_DPD()` in `camlibs/ptp2/ptp-pack.c` (line 842). The function reads the FormFlag byte via `dtoh8o(data, *p…

Vulnerability class: Buffer Overflow

EPSS: 0.000 (1.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.2 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L.

Affected products

Gphoto Libgphoto2 — versions <= 2.5.33

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

https://github.com/gphoto/libgphoto2/security/advisories/GHSA-42cm-m9hc-r7q8 (x_refsource_CONFIRM)
https://github.com/gphoto/libgphoto2/commit/09f8a940b1e418b5693f5c11e3016a1ad2cea62d (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-40339?: CVE-2026-40339 is a medium-severity vulnerability in Gphoto Libgphoto2, classified under Out-of-bounds Read. CVSS score: 5.2/10. Published 2026-04-17.
How severe is CVE-2026-40339?: Medium severity. CVSS v3 base score is 5.2 out of 10.