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, *poffset)` without a prior bounds check. The standard `ptp_unpack_DPD()` at lines 686–687 correctly validates `*offset + sizeof(uint8_t) > dpdlen` before this same read, but the Sony variant omits this check entirely. Commit 09f8a940b1e418b5693f5c11e3016a1ad2cea62d fixes the issue.
Vulnerability class: Buffer Overflow
EPSS: 0.002 (9.9th 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)
References
- security-advisories@github.com (x_refsource_CONFIRM)
- security-advisories@github.com (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 2026-04-18.
- How severe is CVE-2026-40339?
- Medium severity. CVSS v3 base score is 5.2 out of 10.