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High 7.5Published Jul 25, 2017
CVE-2017-9233XML 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…
Updated under an hour ago ()
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It affects libexpat_project libexpat and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- mitre
- NVD analysis
- Modified
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
libexpat_project libexpat libexpat_project:libexpat | through 2.2.0 | NVD |
python python python:python | from 2.7.0 before 2.7.15; from 3.3.0 before 3.3.7; from 3.4.0 before 3.4.7; from 3.5.0 before 3.5.4; from 3.6.0 before 3.6.2 | NVD |
debian debian_linux debian:debian_linux | 8.0; 9.0; 10.0 | NVD |
References
- https://support.apple.com/HT208144x-refsource-confirm
- https://libexpat.github.io/doc/cve-2017-9233/x-refsource-confirm
- https://github.com/libexpat/libexpat/blob/master/expat/Changesx-refsource-confirm
- http://www.securitytracker.com/id/1039427vdb-entry, x-refsource-sectrack
- https://support.apple.com/HT208113x-refsource-confirm
- https://support.apple.com/HT208112x-refsource-confirm
- https://support.apple.com/HT208115x-refsource-confirm
- http://www.debian.org/security/2017/dsa-3898vendor-advisory, x-refsource-debian
- http://www.securityfocus.com/bid/99276vdb-entry, x-refsource-bid
- http://www.openwall.com/lists/oss-security/2017/06/17/7mailing-list, x-refsource-mlist
- https://support.f5.com/csp/article/K03244804x-refsource-confirm
- https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3Emailing-list, x-refsource-mlist
- https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3Emailing-list, x-refsource-mlist
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.