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.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://libexpat.github.io/doc/cve-2017-9233/ Exploit, Technical Description, Vendor Advisory
- https://libexpat.github.io/doc/cve-2017-9233/ Exploit, Technical Description, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 7.5 · libexpat_project, python, debianNVD modified 2026-10-08 21:17
Affected (CPE criteria) 5
cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*cpe:2.3:a:python:python:*:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
References 26
- http://www.debian.org/security/2017/dsa-3898 Third Party Advisory
- http://www.openwall.com/lists/oss-security/2017/06/17/7 Mailing List, VDB Entry
- http://www.securityfocus.com/bid/99276 Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039427 Third Party Advisory, VDB Entry
- https://github.com/libexpat/libexpat/blob/master/expat/Changes Release Notes, Third Party Advisory
- https://libexpat.github.io/doc/cve-2017-9233/ Exploit, Technical Description, Vendor Advisory
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
- https://support.apple.com/HT208112 Third Party Advisory
- https://support.apple.com/HT208113 Third Party Advisory
- https://support.apple.com/HT208115 Third Party Advisory
- https://support.apple.com/HT208144 Third Party Advisory
- https://support.f5.com/csp/article/K03244804 Third Party Advisory
- http://www.debian.org/security/2017/dsa-3898 Third Party Advisory
- http://www.openwall.com/lists/oss-security/2017/06/17/7 Mailing List, VDB Entry
- http://www.securityfocus.com/bid/99276 Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039427 Third Party Advisory, VDB Entry
- https://github.com/libexpat/libexpat/blob/master/expat/Changes Release Notes, Third Party Advisory
- https://libexpat.github.io/doc/cve-2017-9233/ Exploit, Technical Description, Vendor Advisory
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
- https://support.apple.com/HT208112 Third Party Advisory
- https://support.apple.com/HT208113 Third Party Advisory
- https://support.apple.com/HT208115 Third Party Advisory
- https://support.apple.com/HT208144 Third Party Advisory
- https://support.f5.com/csp/article/K03244804 Third Party Advisory