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Slackware: expat Critical Memory Amplification Exploit SSA:2025-260-01

slackware
Calendar Grey September 17, 2025
Dist Slackware Esm H88
Recent expat updates for Fedora 37 and Rawhide tackle significant vulnerabilities concerning resource allocation.
New expat packages are available for Slackware 15.0 and -current to fix security issues

Summary

Here are the details from the Slackware 15.0 ChangeLog: patches/packages/expat-2.7.2-i586-1_slack15.0.txz: Upgraded. This update fixes a security issue: Disallow use of disproportional amounts of dynamic memory from within an Expat parser (e.g. previously a ~250 KiB sized document was able to cause allocation of ~800 MiB from the heap, i.e. an "amplification" of factor ~3,300); once a threshold (that defaults to 64 MiB) is reached, a maximum amplification factor (that defaults to 100.0) is enforced, and violating documents are rejected with an out-of-memory error. For more information, see: https://www.cve.org/CVERecord?id=CVE-2025-59375 (* Security fix *)

Topics%20covered

Topics Covered

security advisory security issue critical slackware expat memory amplification

Where Find New Packages

Thanks to the friendly folks at the OSU Open Source Lab (http://osuosl.org) for donating FTP and rsync hosting to the Slackware project! :-)
Also see the "Get Slack" section on http://www.slackware.com/ for additional mirror sites near you.
Updated package for Slackware 15.0: ftp://ftp.slackware.com/pub/slackware/slackware-15.0/patches/packages/expat-2.7.2-i586-1_slack15.0.txz
Updated package for Slackware x86_64 15.0: ftp://ftp.slackware.com/pub/slackware/slackware64-15.0/patches/packages/expat-2.7.2-x86_64-1_slack15.0.txz
Updated package for Slackware -current: ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/l/expat-2.7.2-i686-1.txz
Updated package for Slackware x86_64 -current: ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/l/expat-2.7.2-x86_64-1.txz

MD5 Signatures

Slackware 15.0 package: fa51f57c6895ed0eda294c1552b017fc expat-2.7.2-i586-1_slack15.0.txz
Slackware x86_64 15.0 package: e0473fd9bf3f189b09a759f58eca320d expat-2.7.2-x86_64-1_slack15.0.txz
Slackware -current package: c03911b55ade23b01518db14264d0c24 l/expat-2.7.2-i686-1.txz
Slackware x86_64 -current package: ca8c71781190d408c6362512716d9898 l/expat-2.7.2-x86_64-1.txz

Severity
critical
Lowest
Low
Medium
High
Critical

Topics%20covered

Topics Covered

security advisory security issue critical slackware expat memory amplification

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Installation Instructions

Installation instructions: Upgrade the package as root: # upgradepkg expat-2.7.2-i586-1_slack15.0.txz