# 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.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H`)
- **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:** Yes
- **Published:** 24 Sep 2026
- **Updated:** 6 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-88371, ECHO-1bae-e9ab-05d0, GHSA-437j-8v4m-47vv, UBUNTU-CVE-2026-88371

## 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 (Incorrect Calculation)

## Which versions are affected by CVE-2026-88371?


## How do I fix CVE-2026-88371?

Apply the vendor's patch.

## Is CVE-2026-88371 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-88371 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-88371 and fix it if it is affected.

What it is: 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.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-88371 exists.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-88371/ (Markdown: https://insights.sbomify.com/CVE-2026-88371/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-88371
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-88371
- OSV: https://osv.dev/vulnerability/CVE-2026-88371

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-88371/
Summaries are generated and may contain mistakes; the official description above is the record.