CVE-2026-40338 libgphoto2 has OOB read in ptp_unpack_Sony_DPD() enumeration count 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 PTP 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-2026-40338?
CVE-2026-40338 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 the PTP_DPFF_Enumeration case of `ptp_unpack_Sony_DPD()` in `camlibs/ptp2/ptp-pack.c` (line 856). The function reads a 2-byte enumeration count N via `dtoh16o(data, *poffset)` without verifying that 2 bytes remain in the buffer. The standard `ptp_unpack_DPD()` at line 704 has this exact check, confirming the Sony variant omitted it by oversight. Commit 3b9f9696be76ae51dca983d9dd8ce586a2561845 fixes the issue.
Weakness: CWE-125
Which versions are affected by CVE-2026-40338?
How do I fix CVE-2026-40338?
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-2026-40338 being exploited?
There is no known exploitation of CVE-2026-40338 in the wild and no public exploit code.
Sources
Also known as AZL-83027, DEBIAN-CVE-2026-40338, GHSA-2hwp-w84q-27hf, UBUNTU-CVE-2026-40338.