Medium 6.5Published Jan 28, 2026

CVE-2025-61728Excessive CPU consumption when building archive index in archive/zip

Updated under an hour ago (Oct 27, 2026, 3:30 AM ET)

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It affects Go standard library archive/zip 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/zip

Exploited in the last 30 days

archive/zip uses a super-linear file name indexing algorithm that is invoked the first time a file in an archive is opened. This can lead to a denial of service when consuming a maliciously constructed ZIP archive.

CVSS: 6.5 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-407
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: Jan 29, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Go standard library archive/zip go_standard_library:archive_zip (from the name)	before 1.24.12; from 1.25.0 before 1.25.6	CNA record
golang go golang:go	before 1.24.12; from 1.25.0 before 1.25.6	NVD

References

References

https://go.dev/cl/736713	patch
https://go.dev/issue/77102	patch
https://groups.google.com/g/golang-announce/c/Vd2tYVM8eUc	release-notes
https://pkg.go.dev/vuln/GO-2026-4342	vendor-advisory
http://www.openwall.com/lists/oss-security/2026/01/15/4	exploit, mailing-list, third-party-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.