---
id: CVE-2026-9080
title: |-
  Calling `curl_easy_pause()` within the event-based `CURLMOPT_SOCKETFUNCTION`
  callback triggers a use-after-free vulnerability, where libcurl attempts to
  store a flag using a dangling struct pointer immediately after that pointer's
  memory…
summary: |-
  Calling `curl_easy_pause()` within the event-based `CURLMOPT_SOCKETFUNCTION`
  callback triggers a use-after-free vulnerability, where libcurl attempts to
  store a flag using a dangling struct pointer immediately after that pointer's
  memory…
severity: high
cvss: 7.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L'
cwe:
  - CWE-416
vendor: haxx
product: curl
affected:
  - 'curl >= 8.13.0, < 8.21.0'
patched:
  - curl 8.21.0
published: '2026-07-03'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T07:16:34.767'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-9080'
references:
  - url: 'https://curl.se/docs/CVE-2026-9080.html'
    label: 2499f714-1537-4658-8207-48ae4bb9eae9
  - url: 'https://curl.se/docs/CVE-2026-9080.json'
    label: 2499f714-1537-4658-8207-48ae4bb9eae9
  - url: 'https://hackerone.com/reports/3749204'
    label: 2499f714-1537-4658-8207-48ae4bb9eae9
  - url: 'https://hackerone.com/reports/3749204'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
tags:
  - nvd
  - cve.org
  - exploit-available
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-07-06T16:54:41.919630Z'
epss: 0.00295
epssPercentile: 0.22442
ingestedAt: '2026-07-04T06:55:48.800Z'
---

## Overview

Calling `curl_easy_pause()` within the event-based `CURLMOPT_SOCKETFUNCTION`
callback triggers a use-after-free vulnerability, where libcurl attempts to
store a flag using a dangling struct pointer immediately after that pointer's
memory has been freed.

## Affected

- `curl >= 8.13.0, < 8.21.0`

## Remediation

Upgrade past the affected range:

- `curl 8.21.0`