---
id: CVE-2025-61724
title: >-
  The Reader.ReadResponse function constructs a response string through repeated
  string concatenation of lines
summary: >-
  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.
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
cwe:
  - CWE-770
vendor: golang
product: go
affected:
  - go < 1.24.8
  - 'go >= 1.25.0, < 1.25.2'
patched:
  - go 1.25.2
published: '2025-10-29'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T10:10:00.227'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-61724'
references:
  - url: 'https://go.dev/cl/709859'
    label: security@golang.org
  - url: 'https://go.dev/issue/75716'
    label: security@golang.org
  - url: 'https://groups.google.com/g/golang-announce/c/4Emdl2iQ_bI'
    label: security@golang.org
  - url: 'https://pkg.go.dev/vuln/GO-2025-4015'
    label: security@golang.org
  - url: 'http://www.openwall.com/lists/oss-security/2025/10/08/1'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
epss: 0.00556
epssPercentile: 0.44582
ingestedAt: '2026-10-08T10:28:17.900Z'
---

## Overview

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.

## Affected

- `go < 1.24.8`
- `go >= 1.25.0, < 1.25.2`

## Remediation

Upgrade past the affected range:

- `go 1.25.2`