# CVE-2026-22891: Memory corruption in libbiosig

> A heap-based buffer overflow in libbiosig allows arbitrary code execution via a crafted Intan CLP file.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 3 Mar 2026
- **Updated:** 3 Mar 2026
- **Also known as:** DEBIAN-CVE-2026-22891, GHSA-qvr5-p47q-wqmc, UBUNTU-CVE-2026-22891

## What is CVE-2026-22891?

CVE-2026-22891 is a critical memory corruption vulnerability in The Biosig Project libbiosig, published on 3 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A heap-based buffer overflow vulnerability exists in the Intan CLP parsing functionality of The Biosig Project libbiosig 3.9.2 and Master Branch (db9a9a63). A specially crafted Intan CLP file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.

Weakness: CWE-122 (Heap-based Buffer Overflow)

## Which versions are affected by CVE-2026-22891?

It affects 1 product.


Products: Libbiosig Project Libbiosig.

## How do I fix CVE-2026-22891?

Upgrade to a fixed version.

## Is CVE-2026-22891 being exploited?

There is no known exploitation of CVE-2026-22891 in the wild and no public exploit code.

## Other vulnerabilities in The Biosig Project libbiosig

- [CVE-2025-66043](https://insights.sbomify.com/CVE-2025-66043/): Memory corruption in libbiosig (critical 9.8)
- [CVE-2025-66044](https://insights.sbomify.com/CVE-2025-66044/): Memory corruption in libbiosig (critical 9.8)
- [CVE-2025-66045](https://insights.sbomify.com/CVE-2025-66045/): Memory corruption in libbiosig (critical 9.8)
- [CVE-2025-66046](https://insights.sbomify.com/CVE-2025-66046/): Memory corruption in libbiosig (critical 9.8)
- [CVE-2025-66047](https://insights.sbomify.com/CVE-2025-66047/): Memory corruption in libbiosig (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-22891 and fix it if it is affected.

What it is: CVE-2026-22891 is a critical memory corruption vulnerability in The Biosig Project libbiosig, published on 3 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-22891 in the wild and no public exploit code.

Affected product: The Biosig Project libbiosig. 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-2026-22891/ (Markdown: https://insights.sbomify.com/CVE-2026-22891/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-22891
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-22891
- OSV: https://osv.dev/vulnerability/CVE-2026-22891

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-22891/
Summaries are generated and may contain mistakes; the official description above is the record.