CVE-2026-40339 libgphoto2 has OOB read in ptp_unpack_Sony_DPD() FormFlag parsing in ptp-pack.c
An out-of-bounds read in libgphoto2 allows attackers to cause denial of service or disclose memory contents via crafted Sony camera data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-40339?
CVE-2026-40339 is a medium-severity memory corruption vulnerability in libgphoto2, published on 17 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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.
Weakness: CWE-125
Which versions are affected by CVE-2026-40339?
How do I fix CVE-2026-40339?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-40339 being exploited?
There is no known exploitation of CVE-2026-40339 in the wild and no public exploit code.
Sources
Also known as AZL-83024, DEBIAN-CVE-2026-40339, GHSA-42cm-m9hc-r7q8, UBUNTU-CVE-2026-40339.