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Vulnerability · Published Apr 17, 2026 · Assigned by GitHub_M

CVE-2026-40333libgphoto2 has OOB read in ptp_unpack_EOS_ImageFormat() and ptp_unpack_EOS_CustomFuncEx() due to missing length parameter in ptp-pack.c

Medium 6.1

In plain English

A medium-severity out-of-bounds read 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 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.1Medium
Exploit odds (30 days)0.2%top 87.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

libgphoto2 is a camera access and control library. In versions up to and including 2.5.33, two functions in camlibs/ptp2/ptp-pack.c accept a data pointer but no length parameter, performing unbounded reads. Their callers in ptp_unpack_EOS_events() have xsize available but never pass it, leaving both functions unable to validate reads against the actual buffer boundary. Commit 1817ecead20c2aafa7549dac9619fe38f47b2f53 patches the issue.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12libgphoto2no fix listedDEBIAN-CVE-2026-40333
Debian:13libgphoto2no fix listedDEBIAN-CVE-2026-40333
Debian:14libgphoto22.5.34-1DEBIAN-CVE-2026-40333
Ubuntu:22.04:LTSlibgphoto22.5.27-1ubuntu0.1USN-8586-1
Ubuntu:22.04:LTSlibgphoto22.5.27-1ubuntu0.1UBUNTU-CVE-2026-40333
Ubuntu:24.04:LTSlibgphoto22.5.31-2.1ubuntu1.1USN-8586-1
Ubuntu:24.04:LTSlibgphoto22.5.31-2.1ubuntu1.1UBUNTU-CVE-2026-40333
Ubuntu:25.10libgphoto2no fix listedUBUNTU-CVE-2026-40333
Ubuntu:26.04:LTSlibgphoto22.5.33-1ubuntu1.1UBUNTU-CVE-2026-40333
Ubuntu:26.04:LTSlibgphoto22.5.33-1ubuntu1.1USN-8586-1

Affected products (as reported)

VendorProductVersions
gphoto libgphoto2 <= 2.5.33

Weakness: CWE-125 · Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

References