CVE-2016-9063
criticalAn integer overflow during the parsing of XML using the Expat library.
Vendor / product: Mozilla — firefox
An integer overflow during the parsing of XML using the Expat library. This vulnerability affects Firefox < 50.
CVSS
9.8
9.8 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (nvd@nist.gov)
Timeline (UTC)
Published: 2018-06-11 21:29
Modified: 2026-10-08 21:17
NVD status: Modified
Last synced 2 days ago
Verified against the source API 2026-10-27 07:06 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
mozilla / firefox <50
debian / debian_linux 8.0, 9.0, 10.0
python / python ≥2.7.0 <2.7.15, ≥3.3.0 <3.3.7, ≥3.4.0 <3.4.7, ≥3.5.0 <3.5.4, ≥3.6.0 <3.6.2
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
Vendor advisory: https://bugzilla.mozilla.org/show_bug.cgi?id=1274777
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2016-89/
Vendor advisory: https://bugzilla.mozilla.org/show_bug.cgi?id=1274777
Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2016-89/
References
- http://www.securityfocus.com/bid/94337 security@mozilla.org
- http://www.securitytracker.com/id/1037298 security@mozilla.org
- http://www.securitytracker.com/id/1039427 security@mozilla.org
- https://bugzilla.mozilla.org/show_bug.cgi?id=1274777 security@mozilla.org
- https://www.debian.org/security/2017/dsa-3898 security@mozilla.org
- https://www.mozilla.org/security/advisories/mfsa2016-89/ security@mozilla.org
- http://www.securityfocus.com/bid/94337 af854a3a-2127-422b-91ae-364da2661108
- http://www.securitytracker.com/id/1037298 af854a3a-2127-422b-91ae-364da2661108
- http://www.securitytracker.com/id/1039427 af854a3a-2127-422b-91ae-364da2661108
- https://bugzilla.mozilla.org/show_bug.cgi?id=1274777 af854a3a-2127-422b-91ae-364da2661108
- https://www.debian.org/security/2017/dsa-3898 af854a3a-2127-422b-91ae-364da2661108
- https://www.mozilla.org/security/advisories/mfsa2016-89/ af854a3a-2127-422b-91ae-364da2661108
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 07:06 UTC · record ↗