Vulnerability · Published Apr 17, 2026 · Assigned by GitHub_M
CVE-2026-40334libgphoto2 missing null termination in ptp_unpack_Canon_FE() filename buffer in ptp-pack.c
Low 3.5
In plain English
A low-severity security flaw 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 8% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
libgphoto2 is a camera access and control library. In versions up to and including 2.5.33, a missing null terminator exists in ptp_unpack_Canon_FE() in camlibs/ptp2/ptp-pack.c (line 1377). The function copies a filename into a 13-byte buffer using strncpy without explicitly null-terminating the result. If the source data is exactly 13 bytes with no null terminator, the buffer is left unterminated, leading to out-of-bounds reads in any subsequent string operation. Commit 259fc7d3bfe534ce4b114c464f55b448670ab873 patches the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | libgphoto2 | no fix listed | DEBIAN-CVE-2026-40334 |
| Debian:13 | libgphoto2 | no fix listed | DEBIAN-CVE-2026-40334 |
| Debian:14 | libgphoto2 | 2.5.34-1 | DEBIAN-CVE-2026-40334 |
| 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-2026-40334 |
| 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-2026-40334 |
| Ubuntu:25.10 | libgphoto2 | no fix listed | UBUNTU-CVE-2026-40334 |
| Ubuntu:26.04:LTS | libgphoto2 | 2.5.33-1ubuntu1.1 | UBUNTU-CVE-2026-40334 |
| 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-170 · Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L