CVE-2025-58183: Go Standard Library Archive/tar

Medium severity, CVSS 4.3. EPSS: 0.4% chance of exploitation in the next 30 days.

tar.Reader does not set a maximum size on the number of sparse region data blocks in GNU tar pax 1.0 sparse files. A maliciously-crafted archive containing a large number of sparse regions can cause a Reader to read an unbounded amount of data from the archive into memory. When reading from a compressed source, a small compressed input can result in large allocations.

Affected products

• Go Standard Library Archive/tar: before 1.24.8 (fixed in 1.24.8); from 1.25.0, before 1.25.2 (fixed in 1.25.2)

Published 2025-10-29. Last modified 2026-10-08.