Out-of-bounds Read in Gphoto Libgphoto2
CVE-2026-40340
libgphoto2 is a camera access and control library. Versions up to and including 2.5.33 have an out-of-bounds read vulnerability in `ptp_unpack_OI()` in `camlibs/ptp2/ptp-pack.c` (lines 530–563). The function validates `len < PTP_oi_SequenceNumber` (i.e., len < 48) but subsequently accesses offsets 48–56, up to 9 bytes beyond the validated boundary, via the Samsung Galaxy 64-bit objectsize detection heuristic. Commit 7c7f515bc88c3d0c4098ac965d313518e0ccbe33 fixes the issue.
Vulnerability class: Buffer Overflow
EPSS: 0.002 (12.5th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
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-2026-40340?
- CVE-2026-40340 is a medium-severity vulnerability in Gphoto Libgphoto2, classified under Out-of-bounds Read. CVSS score: 6.1/10. Published 2026-04-18.
- How severe is CVE-2026-40340?
- Medium severity. CVSS v3 base score is 6.1 out of 10.