Medium 5.5Published Apr 7, 2026

CVE-2026-32288Unbounded allocation for old GNU sparse in archive/tar

Updated under an hour ago (Oct 27, 2026, 5:10 PM ET)

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It affects Go standard library archive/tar and 1 other product. 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 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.

CVSS: 5.5 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
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: Analyzed
Record last updated: Apr 13, 2026
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 1.25.9; from 1.26.0-0 before 1.26.2	CNA record
golang go golang:go	before 1.25.9; from 1.26.0 before 1.26.2	NVD

References

References

https://go.dev/cl/763766	patch
https://go.dev/issue/78301	issue-tracking
https://groups.google.com/g/golang-announce/c/0uYbvbPZRWU	mailing-list, release-notes
https://pkg.go.dev/vuln/GO-2026-4869	vendor-advisory

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.