CVE-2026-32288

Unbounded allocation for old GNU sparse in archive/tar

State: Published
Severity: 5.5 Medium
Published: Apr 8, 2026
Updated: Apr 13, 2026
Reserved: Mar 11, 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.

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
archive/tarGo standard library	before 1.25.9Affected 1.26.0-0 to before 1.26.2Affected

References

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

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