---
id: CVE-2026-3805
title: |-
  When doing a second SMB request to the same host again, curl would wrongly use
  a data pointer pointing into already freed memory.
summary: |-
  When doing a second SMB request to the same host again, curl would wrongly use
  a data pointer pointing into already freed memory.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-416
vendor: haxx
product: curl
affected:
  - 'curl >= 8.13.0, < 8.19.0'
patched:
  - curl 8.19.0
published: '2026-03-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T21:17:06.383'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-3805'
references:
  - url: 'https://curl.se/docs/CVE-2026-3805.html'
    label: 2499f714-1537-4658-8207-48ae4bb9eae9
  - url: 'https://curl.se/docs/CVE-2026-3805.json'
    label: 2499f714-1537-4658-8207-48ae4bb9eae9
  - url: 'https://hackerone.com/reports/3591944'
    label: 2499f714-1537-4658-8207-48ae4bb9eae9
  - url: 'http://www.openwall.com/lists/oss-security/2026/03/11/4'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - exploit-available
  - cve.org
epss: 0.00951
epssPercentile: 0.59649
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/Rat5ak/CVE-2026-3805-curl-SMB-UAF'
  checkedAt: '2026-09-26T09:05:42.825Z'
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-03-11T15:45:10.217077Z'
ingestedAt: '2026-09-14T21:15:17.559Z'
---

## Overview

When doing a second SMB request to the same host again, curl would wrongly use
a data pointer pointing into already freed memory.

## Affected

- `curl >= 8.13.0, < 8.19.0`

## Remediation

Upgrade past the affected range:

- `curl 8.19.0`