Medium 4.3Published Oct 29, 2025

CVE-2025-58183Unbounded allocation when parsing GNU sparse map in archive/tar

Updated under an hour ago (Oct 27, 2026, 1:50 AM ET)

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It affects Go standard library archive/tar. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Go standard library archive/tar

Exploited in the last 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.

CVSS: 4.3 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-400
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Go
NVD analysis: Deferred
Record last updated: Nov 4, 2025
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Go standard library archive/tar go_standard_library:archive_tar (from the name)	before 1.24.8; from 1.25.0 before 1.25.2	CNA record

References

References

https://go.dev/cl/709861
https://go.dev/issue/75677
https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI
https://pkg.go.dev/vuln/GO-2025-4014
http://www.openwall.com/lists/oss-security/2025/10/08/1

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.