CVE-2026-88371 Denial of service in n/a
An attacker can cause a denial of service in the ZBar library by providing specially crafted Code 128 input that triggers undefined behavior.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-88371?
CVE-2026-88371 is a medium-severity denial of service vulnerability in n/a, published on 24 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
ZBar commit 2ea2ca58 contains an undefined-behavior vulnerability in the Code 128 decode6() function. When processing specially crafted Code 128 input, decode_e() can return -1 for an invalid edge pattern, and decode6() subsequently left-shifts this negative signed value while constructing the edge signature. The operation invokes undefined behavior and can terminate trap-mode UBSan builds with SIGILL, resulting in denial of service.
Weakness: CWE-682
Which versions are affected by CVE-2026-88371?
How do I fix CVE-2026-88371?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-88371 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-88371 exists.
Sources
Also known as DEBIAN-CVE-2026-88371, ECHO-1bae-e9ab-05d0, GHSA-437j-8v4m-47vv, UBUNTU-CVE-2026-88371.