CVE-2026-40340 libgphoto2 has OOB read in ptp_unpack_OI() in ptp-pack.c via malicious PTP ObjectInfo response
An out-of-bounds read in libgphoto2 allows attackers to cause denial of service or disclose information via a malicious PTP response.
- 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-2026-40340?
CVE-2026-40340 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 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.
Weakness: CWE-125
Which versions are affected by CVE-2026-40340?
How do I fix CVE-2026-40340?
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-2026-40340 being exploited?
There is no known exploitation of CVE-2026-40340 in the wild and no public exploit code.
Sources
Also known as AZL-83030, DEBIAN-CVE-2026-40340, GHSA-xfw3-xvjp-5wcv, UBUNTU-CVE-2026-40340.