Unbounded allocation for old GNU sparse in archive/tar

GO-2026-4869 · BIT-golang-2026-32288 · CVE-2026-32288

Published Apr 7, 2026 · Modified May 15, 2026

Description

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.

References

FIX https://go.dev/cl/763766
REPORT https://go.dev/issue/78301
WEB https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU

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