Medium severity · published Oct 29, 2025
CVE-2025-61724
Excessive CPU consumption in Reader.ReadResponse in net/textproto
5.3
CVSS
0.6%
EPSS
No
On KEV
Description
The Reader.ReadResponse function constructs a response string through repeated string concatenation of lines. When the number of lines in a response is large, this can cause excessive CPU consumption.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NE
net/textproto · Go standard library
before 1.24.8; 1.25.0 before 1.25.2 · source: vendor
GO
GO · Golang
before 1.24.8; 1.25.0 before 1.25.2 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-61724
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-61724
Patch
https://go.dev/cl/709859
Issue Tracking
https://go.dev/issue/75716
Mailing List
https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI
Vendor Advisory
https://pkg.go.dev/vuln/GO-2025-4015
Mailing List
http://www.openwall.com/lists/oss-security/2025/10/08/1
More from net/textproto
7.5
CVE-2026-94440
Memory limit bypass when parsing MIME headers in net/textproto, mime/multipart
5.3
CVE-2026-42507
Arbitrary inputs are included in errors without any escaping in net/textproto