CVE-2026-40334
libgphoto2 missing null termination in ptp_unpack_Canon_FE() filename buffer in ptp-pack.c
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.
INFO
Published Date :
April 18, 2026, 12:16 a.m.
Last Modified :
Oct. 26, 2026, 10:10 p.m.
Remotely Exploit :
No
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | LOW | [email protected] | ||||
| CVSS 3.1 | LOW | MITRE-CVE |
Solution
- Update libgphoto2 to version 2.5.34.
- Apply the fix from commit 259fc7d3bfe534ce4b114c464f55b448670ab873.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-40334.
| URL | Resource |
|---|---|
| https://github.com/gphoto/libgphoto2/commit/259fc7d3bfe534ce4b114c464f55b448670ab873 | |
| https://github.com/gphoto/libgphoto2/security/advisories/GHSA-ph87-cc3j-c6hm |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-40334 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-40334
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-40334 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-40334 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 26, 2026
Action Type Old Value New Value Added Translation Title: libgphoto2 de gphoto, Description: libgphoto2 es una biblioteca de acceso y control de cámaras. En versiones hasta la 2.5.33 inclusive, existe un terminador nulo faltante en ptp_unpack_Canon_FE() en camlibs/ptp2/ptp-pack.c (línea 1377). La función copia un nombre de archivo en un búfer de 13 bytes usando strncpy sin terminar explícitamente el resultado con un nulo. Si los datos de origen tienen exactamente 13 bytes sin un terminador nulo, el búfer queda sin terminar, lo que lleva a lecturas fuera de límites en cualquier operación de cadena posterior. El commit 259fc7d3bfe534ce4b114c464f55b448670ab873 corrige el problema. -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'gphoto', 'product': 'libgphoto2', 'versions': [{'status': 'affected', 'version': '<= 2.5.33'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-40334', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-04-20T13:27:56.209528Z'} -
New CVE Received by [email protected]
Apr. 18, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L Added CWE CWE-170 Added Reference https://github.com/gphoto/libgphoto2/commit/259fc7d3bfe534ce4b114c464f55b448670ab873 Added Reference https://github.com/gphoto/libgphoto2/security/advisories/GHSA-ph87-cc3j-c6hm