CVE-2026-32288

MEDIUM 5.5

Unbounded allocation for old GNU sparse in archive/tar

CVSS Score

5.5

EPSS Score

0.0%

EPSS Percentile

1th

tar.Reader can allocate an unbounded amount of memory when reading a maliciously-crafted archive containing a large number of sparse regions encoded in the "old GNU sparse map" format.

Vendor	go standard library
Product	archive/tar
Published	Apr 8, 2026
Last Updated	Apr 13, 2026

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Affected Versions

Go standard library / archive/tar

0 < 1.25.9 1.26.0-0 < 1.26.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

go.dev: https://go.dev/cl/763766 go.dev: https://go.dev/issue/78301 groups.google.com: https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-4869

Credits

Colin Walters ([email protected]) Uuganbayar Lkhamsuren (https://github.com/uug4na) Jakub Ciolek