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golang: archive/tar: Unbounded allocation when parsing GNU sparse map

🗓️ 15 Apr 2026 15:24:38Reported by RedHatType 
redhat
 redhat
🔗 access.redhat.com👁 6 Views

Go archive/tar reader may allocate unbounded memory parsing GNU sparse pax 1.0 regions, causing DoS.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9.0aarch64buildah1:1.26.9-1.el9_0.3buildah-1:1.26.9-1.el9_0.3.aarch64.rpm
Red Hat Enterprise Linux9.0ppc64lebuildah1:1.26.9-1.el9_0.3buildah-1:1.26.9-1.el9_0.3.ppc64le.rpm
Red Hat Enterprise Linux9.0s390xbuildah1:1.26.9-1.el9_0.3buildah-1:1.26.9-1.el9_0.3.s390x.rpm
Red Hat Enterprise Linux9.0x86_64buildah1:1.26.9-1.el9_0.3buildah-1:1.26.9-1.el9_0.3.x86_64.rpm
Red Hat Enterprise Linux9.0aarch64buildah-debuginfo1:1.26.9-1.el9_0.3buildah-debuginfo-1:1.26.9-1.el9_0.3.aarch64.rpm
Red Hat Enterprise Linux9.0ppc64lebuildah-debuginfo1:1.26.9-1.el9_0.3buildah-debuginfo-1:1.26.9-1.el9_0.3.ppc64le.rpm
Red Hat Enterprise Linux9.0s390xbuildah-debuginfo1:1.26.9-1.el9_0.3buildah-debuginfo-1:1.26.9-1.el9_0.3.s390x.rpm
Red Hat Enterprise Linux9.0x86_64buildah-debuginfo1:1.26.9-1.el9_0.3buildah-debuginfo-1:1.26.9-1.el9_0.3.x86_64.rpm
Red Hat Enterprise Linux9.0aarch64buildah-debugsource1:1.26.9-1.el9_0.3buildah-debugsource-1:1.26.9-1.el9_0.3.aarch64.rpm
Red Hat Enterprise Linux9.0ppc64lebuildah-debugsource1:1.26.9-1.el9_0.3buildah-debugsource-1:1.26.9-1.el9_0.3.ppc64le.rpm
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17 Jul 2026 09:23Current
5.8Medium risk
Vulners AI Score5.8
CVSS 3.14.3
EPSS0.00419
SSVC
6