Vulnerability · Published Apr 17, 2026 · Assigned by GitHub_M
CVE-2026-40339libgphoto2 has OOB read in ptp_unpack_Sony_DPD() FormFlag parsing in ptp-pack.c
Medium 5.2
In plain English
A medium-severity out-of-bounds read in libgphoto2 from gphoto. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libgphoto2 | no fix listed | DEBIAN-CVE-2026-40339 |
| Debian:13 | libgphoto2 | no fix listed | DEBIAN-CVE-2026-40339 |
| Debian:14 | libgphoto2 | 2.5.34-1 | DEBIAN-CVE-2026-40339 |
| Ubuntu:22.04:LTS | libgphoto2 | 2.5.27-1ubuntu0.1 | USN-8586-1 |
| Ubuntu:22.04:LTS | libgphoto2 | 2.5.27-1ubuntu0.1 | UBUNTU-CVE-2026-40339 |
| Ubuntu:24.04:LTS | libgphoto2 | 2.5.31-2.1ubuntu1.1 | USN-8586-1 |
| Ubuntu:24.04:LTS | libgphoto2 | 2.5.31-2.1ubuntu1.1 | UBUNTU-CVE-2026-40339 |
| Ubuntu:25.10 | libgphoto2 | no fix listed | UBUNTU-CVE-2026-40339 |
| Ubuntu:26.04:LTS | libgphoto2 | 2.5.33-1ubuntu1.1 | UBUNTU-CVE-2026-40339 |
| Ubuntu:26.04:LTS | libgphoto2 | 2.5.33-1ubuntu1.1 | USN-8586-1 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| gphoto | libgphoto2 | <= 2.5.33 |
Weakness: CWE-125 · Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L