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Slackware c-ares Critical DoS Memory Exhaustion Fix 2026-187-01

slackware
Calendar Grey July 6, 2026
Dist Slackware Esm H88
New c-ares packages for Slackware 15.0 address critical security issues related to DoS attacks.
New c-ares 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/c-ares-1.34.7-i586-1_slack15.0.txz: Upgraded. This release fixes the following security issues: Use-after-free / double-free in c-ares' query-completion handling, remotely triggerable via ares_getaddrinfo() over TCP. CPU-exhaustion denial of service via unbounded DNS name compression pointer chains. Memory-amplification denial of service via unvalidated DNS header record counts. For more information, see: https://www.cve.org/CVERecord?id=CVE-2026-33630 https://github.com/c-ares/c-ares/security/advisories/GHSA-6wfj-rwm7-3542 https://github.com/c-ares/c-ares/security/advisories/GHSA-pjmc-gx33-gc76 https://github.com/c-ares/c-ares/security/advisories/GHSA-jv8r-gqr9-68wj (* Security fix *)

Topics%20covered

Topics Covered

security advisory denial of service critical slackware memory exhaustion c-ares

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://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/c-ares-1.34.7-i586-1_slack15.0.txz
Updated package for Slackware x86_64 15.0: ftp://ftp.slackware.com/pub/slackware/slackware64-15.0/patches/packages/c-ares-1.34.7-x86_64-1_slack15.0.txz
Updated package for Slackware -current: ftp://ftp.slackware.com/pub/slackware/slackware-current/slackware/n/c-ares-1.34.7-i686-1.txz
Updated package for Slackware x86_64 -current: ftp://ftp.slackware.com/pub/slackware/slackware64-current/slackware64/n/c-ares-1.34.7-x86_64-1.txz

MD5 Signatures

Slackware 15.0 package: e2e1d5fa19673361d0a09124739b7c36 c-ares-1.34.7-i586-1_slack15.0.txz
Slackware x86_64 15.0 package: f5288e7966693f035164baddcfadb33e c-ares-1.34.7-x86_64-1_slack15.0.txz
Slackware -current package: ece3bd50d8242ed6d3508cf1f2d773dd n/c-ares-1.34.7-i686-1.txz
Slackware x86_64 -current package: dc2284c8f9da14be6ca705b9dc74116c n/c-ares-1.34.7-x86_64-1.txz

Severity
critical
Lowest
Low
Medium
High
Critical

Topics%20covered

Topics Covered

security advisory denial of service critical slackware memory exhaustion c-ares

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Installation Instructions

Installation instructions: Upgrade the package as root: # upgradepkg c-ares-1.34.7-i586-1_slack15.0.txz