Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
CVE-2013-0340
libexpat — expat before version 2.4.0 does not properly handle entities expansion unless an application developer uses the XML_SetEntityDeclHandler …
AV AC Au C I A CVSS EPSS %ile KEV
N M N P P P 6.8 .1943 97.3 —
AFFECTED
Product Versions Fixed
libexpat unspecified —
TIMELINE
Dec 6 Reserved by redhat
Jan 21 Published (CNA: redhat)
Oct 9 ENRICHED — CVE-2013-0340 (libexpat). Received CVSS 6.8 and CPE data from NVD.
Oct 9 EXPLOIT PUBLISHED — CVE-2013-0340 (libexpat). Public exploit reference added.
Oct 14 EXPLOIT PUBLISHED — CVE-2013-0340 (libexpat). Public exploit reference added.
Description
expat before version 2.4.0 does not properly handle entities expansion unless an application developer uses the XML_SetEntityDeclHandler function, which allows remote attackers to cause a denial of service (resource consumption), send HTTP requests to intranet servers, or read arbitrary files via a crafted XML document, aka an XML External Entity (XXE) issue. NOTE: it could be argued that because expat already provides the ability to disable external entity expansion, the responsibility for resolving this issue lies with application developers; according to this argument, this entry should be REJECTed, and each affected application would need its own CVE.
Lifecycle
Complete event history — 5 events, chronological
| Date | Event | Detail |
|---|
| December 6, 2012 | Reserved | Reserved by redhat |
| January 21, 2014 | Published | Published (CNA: redhat) |
| October 9, 2026 | ENRICHED | ENRICHED — CVE-2013-0340 (libexpat). Received CVSS 6.8 and CPE data from NVD. |
| October 9, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2013-0340 (libexpat). Public exploit reference added. |
| October 14, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2013-0340 (libexpat). Public exploit reference added. |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| — | libexpat | — | — | — |
References (26)
- http://openwall.com/lists/oss-security/2013/02/22/3 [Exploit, Mailing List, Third Party Advisory]
- http://seclists.org/fulldisclosure/2021/Oct/61 [Mailing List, Third Party Advisory]
- http://seclists.org/fulldisclosure/2021/Oct/62 [Mailing List, Third Party Advisory]
- http://seclists.org/fulldisclosure/2021/Oct/63 [Mailing List, Third Party Advisory]
- http://seclists.org/fulldisclosure/2021/Sep/33 [Mailing List, Third Party Advisory]
- http://seclists.org/fulldisclosure/2021/Sep/34 [Mailing List, Third Party Advisory]
- http://seclists.org/fulldisclosure/2021/Sep/35 [Mailing List, Third Party Advisory]
- http://seclists.org/fulldisclosure/2021/Sep/38 [Mailing List, Third Party Advisory]
- http://seclists.org/fulldisclosure/2021/Sep/39 [Mailing List, Third Party Advisory]
- http://seclists.org/fulldisclosure/2021/Sep/40 [Mailing List, Third Party Advisory]
- http://securitytracker.com/id?1028213 [Third Party Advisory, VDB Entry]
- http://www.openwall.com/lists/oss-security/2013/04/12/6 [Mailing List, Third Party Advisory]
- http://www.openwall.com/lists/oss-security/2021/10/07/4 [Mailing List, Third Party Advisory]
- http://www.osvdb.org/90634 [Broken Link]
- http://www.securityfocus.com/bid/58233 [Broken Link, Third Party Advisory, VDB Entry]
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://github.com/libexpat/libexpat/blob/R_2_4_1/expat/Changes
- https://lists.apache.org/thread.html/r41eca5f4f09e74436cbb05dec450fc2bef37b5d3e966aa7cc5fada6d%40%3Cannounce.apache.org%3E
- https://lists.apache.org/thread.html/rfb2c193360436e230b85547e85a41bea0916916f96c501f5b6fc4702%40%3Cusers.openoffice.apache.org%3E
- https://security.gentoo.org/glsa/201701-21 [Third Party Advisory]
- https://support.apple.com/kb/HT212804 [Third Party Advisory]
- https://support.apple.com/kb/HT212805 [Third Party Advisory]
- https://support.apple.com/kb/HT212807 [Third Party Advisory]
- https://support.apple.com/kb/HT212814 [Third Party Advisory]
- https://support.apple.com/kb/HT212815 [Third Party Advisory]
- https://support.apple.com/kb/HT212819 [Third Party Advisory]
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2013-0340 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.
