Medium severity · published Jan 28, 2026
CVE-2025-61728
Excessive CPU consumption when building archive index in archive/zip
6.5
CVSS
0.7%
EPSS
No
On KEV
Description
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 54% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AR
archive/zip · Go standard library
before 1.24.12; 1.25.0 before 1.25.6 · source: vendor
GO
GO · Golang
before 1.24.12; 1.25.0 before 1.25.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-61728
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-61728
Patch
https://go.dev/cl/736713
Patch
https://go.dev/issue/77102
Release Notes
https://groups.google.com/g/golang-announce/c/Vd2tYVM8eUc
Vendor Advisory
https://pkg.go.dev/vuln/GO-2026-4342
Exploit
http://www.openwall.com/lists/oss-security/2026/01/15/4