CVE-2026-40386 Integer overflow in libexif
Attackers can crash applications or leak memory by exploiting an integer underflow in libexif's MakerNote decoding logic.
- 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-2026-40386?
CVE-2026-40386 is a medium-severity vulnerability in libexif, published on 12 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In libexif through 0.6.25, an integer underflow in size checking for Fuji and Olympus MakerNote decoding could be used by attackers to crash or leak information out of libexif-using programs.
Weakness: CWE-191
Which versions are affected by CVE-2026-40386?
It affects 1 product.
Linux distribution packages (14)
libexif AlmaLinux:10 | All versions | 0.6.24-9.el10_2.1 |
libexif-devel AlmaLinux:10 | All versions | 0.6.24-9.el10_2.1 |
libexif-doc AlmaLinux:10 | All versions | 0.6.24-9.el10_2.1 |
libexif Red Hat:enterprise_linux:10.2 | All versions | 0:0.6.24-9.el10_2.1 |
libexif-debuginfo Red Hat:enterprise_linux:10.2 | All versions | 0:0.6.24-9.el10_2.1 |
libexif-debugsource Red Hat:enterprise_linux:10.2 | All versions | 0:0.6.24-9.el10_2.1 |
libexif-devel Red Hat:enterprise_linux:10.2 | All versions | 0:0.6.24-9.el10_2.1 |
libexif-doc Red Hat:enterprise_linux:10.2 | All versions | 0:0.6.24-9.el10_2.1 |
libexif Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.6.24-9.el10_0.1 |
libexif-debuginfo Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.6.24-9.el10_0.1 |
libexif-debugsource Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.6.24-9.el10_0.1 |
libexif-devel Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.6.24-9.el10_0.1 |
libexif-doc Red Hat:enterprise_linux_eus:10.0 | All versions | 0:0.6.24-9.el10_0.1 |
libexif Rocky Linux:10 | All versions | 0:0.6.24-9.el10_2.1 |
Products include Libexif Project Libexif.
How do I fix CVE-2026-40386?
Apply the vendor's patch.
Is CVE-2026-40386 being exploited?
There is no known exploitation of CVE-2026-40386 in the wild and no public exploit code.
Other vulnerabilities in libexif
Sources
Also known as ALSA-2026:22529, AZL-82682, DEBIAN-CVE-2026-40386, GHSA-p6wp-hhx9-7jj5, JLSEC-2026-152, RHSA-2026:22529 and 3 more.