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CVE-2016-9063
An integer overflow during the parsing of XML using the Expat library. This vulnerability affects Firefox < 50.
Critical9.8EPSS 5.4%
- Published
- Updated
- Reserved
- Assigned by
- mozilla
Description
An integer overflow during the parsing of XML using the Expat library. This vulnerability affects Firefox < 50.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 5.4% · top 7.4% of all CVEs (2 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: total
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Weakness
- Possible integer overflow to fix inside XML_Parse in Expat
- CWE-190 (opens in a new tab)
Affected products
Mozilla · Firefox
- affected unspecified – < 50
References (6)
- DSA-3898 (opens in a new tab)vendor-advisoryx_refsource_DEBIANx_transferred
- 94337 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- https://bugzilla.mozilla.org/show_bug.cgi?id=1274777 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 1037298 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- 1039427 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- https://www.mozilla.org/security/advisories/mfsa2016-89/ (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Record last updated .