Disclosure summary
XML External Entity vulnerability in libexpat 2.2.0 and earlier (Expat XML Parser Library) allows attackers to put the parser in an infinite loop using a malformed external entity definition from an external DTD.
Source-reported weakness categories
CWE-611, CWE-835
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2017-9233
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
| Vendor | Product / association | Version / bounds |
|---|---|---|
| libexpat_project | libexpat | * {"versionEndIncluding":"2.2.0"} |
| python | python | * {"versionStartIncluding":"3.6.0","versionEndExcluding":"3.6.2"} |
| debian | debian_linux | 8.0 |
| debian | debian_linux | 9.0 |
| debian | debian_linux | 10.0 |
Original records & references
- NIST NVD record
- CVE Program record
- github.com — Release Notes, Third Party Advisory
- libexpat.github.io — Exploit, Technical Description, Vendor Advisory
- lists.apache.org
- lists.apache.org
- support.apple.com — Third Party Advisory
- support.apple.com — Third Party Advisory
- support.apple.com — Third Party Advisory
- support.apple.com — Third Party Advisory
- support.f5.com — Third Party Advisory
- github.com — Release Notes, Third Party Advisory
- libexpat.github.io — Exploit, Technical Description, Vendor Advisory
- lists.apache.org
- lists.apache.org
- support.apple.com — Third Party Advisory
- support.apple.com — Third Party Advisory
- support.apple.com — Third Party Advisory
- support.apple.com — Third Party Advisory
- support.f5.com — Third Party Advisory
PUBLISHED 2017-07-25T16:29:00-04:00
MODIFIED 2026-10-08T17:17:06-04:00
INGESTED 2026-10-10T20:50:18-04:00