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ALSA-2020:4846 — Moderate: mingw-expat security update

Affected: AlmaLinux:8: mingw32-expat, AlmaLinux:8: mingw64-expat

Expat is a C library for parsing XML documents. The mingw-expat packages provide a port of the Expat library for MinGW.

Security Fix(es):

* expat: large number of colons in input makes parser consume high amount of resources, leading to DoS (CVE-2018-20843)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

bdu:2019-03327

Withdrawn: BELL-CVE-2018-20843 — CVE-2018-20843 does not affect BellSoft software

Withdrawn by the publisher.

certfr-2020-avi-691 — De multiples vulnérabilités ont été découvertes dans les produits Juniper. Elles permettent à un attaquant de provoquer…

certfr-2020-avi-691

Withdrawn: CLEANSTART-2026-PJ84279 — Security fixes in expat 2.2.7-r0

Withdrawn by the publisher.

Affected: CleanStart: expat

Package expat version 2.2.7-r0 fixes 1 vulnerabilities: CVE-2018-20843

EUVD-2026-242234

fkie_cve-2018-20843

In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).

GHSA-hj5j-c8qp-mgmv

gsd-2018-20843

ICSA-23-348-10 — Siemens SIMATIC S7-1500

expat 2.1.0 and earlier 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. shadow: TOCTOU (time-of-check time-of-use) race condition when copying and removing directory trees run-mailcap in the Debian mime-support package before 3.52-1+deb7u1 allows context-dependent attackers to execute arbitrary commands via shell metacharacters in a filename. In Python (aka CPython) up to 3.10.8, the mailcap module does not add escape characters into commands discovered in the system mailcap file. This may allow attackers to inject shell commands into applications that call mailcap.findmatch with untrusted input (if they lack validation of user-provided filenames or arguments). The fix is also back-ported to 3.7, 3.8, 3.9 Use-after-free vulnerability in bzip2recover in bzip2 1.0.6 allows remote attackers to cause a denial of service (crash) via a crafted bzip2 file, related to block ends set to before the start o…

msrc_CVE-2018-20843 — In libexpat in Expat before 2.2.7 XML input including XML names that contain a large number of colons could make the XM…

msrc_CVE-2018-20843

openSUSE-SU-2019:1777-1 — Security update for expat

Security update for expat

RHSA-2020:2644 — Red Hat Security Advisory: Red Hat JBoss Core Services Apache HTTP Server 2.4.37 SP3 security update

expat: large number of colons in input makes parser consume high amount of resources, leading to DoS httpd: mod_http2: read-after-free on a string compare httpd: mod_http2: possible crash on late upgrade expat: heap-based buffer over-read via crafted XML input libxml2: memory leak in xmlParseBalancedChunkMemoryRecover in parser.c libxml2: memory leak in xmlSchemaPreRun in xmlschemas.c httpd: mod_proxy_ftp use of uninitialized value libxml2: infinite loop in xmlStringLenDecodeEntities in some end-of-file situations nghttp2: overly large SETTINGS frames can lead to DoS

SUSE-SU-2019:1834-1 — Security update for expat

Security update for expat

UBUNTU-CVE-2018-20843

Affected: Ubuntu:Pro:14.04:LTS: expat, Ubuntu:Pro:14.04:LTS: vtk, Ubuntu:Pro:14.04:LTS: coin3, Ubuntu:Pro:14.04:LTS: vnc4, Ubuntu:Pro:14.04:LTS: xmlrpc-c, Ubuntu:16.04:LTS: expat, Ubuntu:Pro:16.04:LTS: libxmltok, Ubuntu:Pro:16.04:LTS: vtk, Ubuntu:Pro:16.04:LTS: ayttm, Ubuntu:Pro:16.04:LTS: cableswig and 41 more

WID-SEC-W-2024-1735 — expat: Schwachstelle ermöglicht Denial of Service

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in expat ausnutzen, um einen Denial of Service Angriff durchzuführen.