Python 3.8 and 3 others: expat before version 2.4.0 does not properly handle entities expansion unless an application developer…
CVE-2013-0340 is fixed in 3 products on 2 platforms, first by Python 3.9 3.9.7, released August 30, 2021. 3 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Python 3.9 | 3.9.7 | Python 3.9 3.9.7 | Aug 30, 2021 |
| Linux | |||
| expat · RHEL 8 | 0:2.5.0-1.el8_10 | RHSA-2025:21776 | Nov 19, 2025 |
| expat · RHEL 9 | 0:2.4.9-1.el9_1 | RHBA-2022:8290 | Nov 15, 2022 |
| expat · almalinux 8 | 2.5.0-1.el8_10 | ALSA-2025:21776 | Nov 19, 2025 |
| expat-devel · RHEL 8 | 0:2.5.0-1.el8_10 | RHSA-2025:21776 | Nov 19, 2025 |
| expat-devel · RHEL 9 | 0:2.4.9-1.el9_1 | RHBA-2022:8290 | Nov 15, 2022 |
| expat-devel · almalinux 8 | 2.5.0-1.el8_10 | ALSA-2025:21776 | Nov 19, 2025 |
| No fix yet | |||
| Python 3.6 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.7 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.8 (Windows apps) | No fix yet | no-fix | n/a |
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