---
id: CVE-2026-92388
title: FTP wildcard write callback mixup
summary: |-
  When an FTP wildcard `LIST` operation fails, libcurl omits the restoration
  path meant for successful listings, leaving the write callback set to the
  internal listing parser and the write callback data pointing directly to the
  easy handle…
severity: none
cwe:
  - CWE-416
vendor: curl
product: curl
affected:
  - curl >= 8.22.0 <= 8.22.0
  - curl >= 8.21.0 <= 8.21.0
  - curl >= 8.20.0 <= 8.20.0
  - curl >= 8.19.0 <= 8.19.0
  - curl >= 8.18.0 <= 8.18.0
  - curl >= 8.17.0 <= 8.17.0
  - curl >= 8.16.0 <= 8.16.0
  - curl >= 8.15.0 <= 8.15.0
  - curl >= 8.14.1 <= 8.14.1
  - curl >= 8.14.0 <= 8.14.0
  - curl >= 8.13.0 <= 8.13.0
  - curl >= 8.12.1 <= 8.12.1
  - curl >= 8.12.0 <= 8.12.0
  - curl >= 8.11.1 <= 8.11.1
  - curl >= 8.11.0 <= 8.11.0
  - curl >= 8.10.1 <= 8.10.1
  - curl >= 8.10.0 <= 8.10.0
  - curl >= 8.9.1 <= 8.9.1
  - curl >= 8.9.0 <= 8.9.0
  - curl >= 8.8.0 <= 8.8.0
  - curl >= 8.7.1 <= 8.7.1
  - curl >= 8.7.0 <= 8.7.0
  - curl >= 8.6.0 <= 8.6.0
  - curl >= 8.5.0 <= 8.5.0
  - curl >= 8.4.0 <= 8.4.0
  - curl >= 8.3.0 <= 8.3.0
  - curl >= 8.2.1 <= 8.2.1
  - curl >= 8.2.0 <= 8.2.0
  - curl >= 8.1.2 <= 8.1.2
  - curl >= 8.1.1 <= 8.1.1
  - curl >= 8.1.0 <= 8.1.0
  - curl >= 8.0.1 <= 8.0.1
  - curl >= 8.0.0 <= 8.0.0
  - curl >= 7.88.1 <= 7.88.1
  - curl >= 7.88.0 <= 7.88.0
  - curl >= 7.87.0 <= 7.87.0
  - curl >= 7.86.0 <= 7.86.0
  - curl >= 7.85.0 <= 7.85.0
  - curl >= 7.84.0 <= 7.84.0
  - curl >= 7.83.1 <= 7.83.1
  - curl >= 7.83.0 <= 7.83.0
  - curl >= 7.82.0 <= 7.82.0
  - curl >= 7.81.0 <= 7.81.0
  - curl >= 7.80.0 <= 7.80.0
  - curl >= 7.79.1 <= 7.79.1
  - curl >= 7.79.0 <= 7.79.0
  - curl >= 7.78.0 <= 7.78.0
  - curl >= 7.77.0 <= 7.77.0
  - curl >= 7.76.1 <= 7.76.1
  - curl >= 7.76.0 <= 7.76.0
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T20:20:41.220Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-92388'
references:
  - url: 'https://curl.se/docs/CVE-2026-92388.json'
    label: json
  - url: 'https://curl.se/docs/CVE-2026-92388.html'
    label: www
  - url: 'https://hackerone.com/reports/4022070'
    label: issue
tags:
  - cve.org
ingestedAt: '2026-10-20T21:19:21.283Z'
---

## Overview

When an FTP wildcard `LIST` operation fails, libcurl omits the restoration
path meant for successful listings, leaving the write callback set to the
internal listing parser and the write callback data pointing directly to the
easy handle. Subsequent reuse of this handle triggers an immediate crash, and
cloning it via `curl_easy_duphandle()` copies this corrupted state into the
duplicate. If the original handle is subsequently freed, executing a transfer
on the cloned handle causes a heap use-after-free read against the dangling
handle reference; alternatively, reusing the original or cloned handle while
changing only  `CURLOPT_WRITEDATA` (and omitting `CURLOPT_WRITEFUNCTION`)
results in type confusion, forcing the internal parser to interpret incoming
server response bytes into memory at the application-supplied write data
pointer.

## Affected

- `curl >= 8.22.0 <= 8.22.0`
- `curl >= 8.21.0 <= 8.21.0`
- `curl >= 8.20.0 <= 8.20.0`
- `curl >= 8.19.0 <= 8.19.0`
- `curl >= 8.18.0 <= 8.18.0`
- `curl >= 8.17.0 <= 8.17.0`
- `curl >= 8.16.0 <= 8.16.0`
- `curl >= 8.15.0 <= 8.15.0`
- `curl >= 8.14.1 <= 8.14.1`
- `curl >= 8.14.0 <= 8.14.0`
- `curl >= 8.13.0 <= 8.13.0`
- `curl >= 8.12.1 <= 8.12.1`
- `curl >= 8.12.0 <= 8.12.0`
- `curl >= 8.11.1 <= 8.11.1`
- `curl >= 8.11.0 <= 8.11.0`
- `curl >= 8.10.1 <= 8.10.1`
- `curl >= 8.10.0 <= 8.10.0`
- `curl >= 8.9.1 <= 8.9.1`
- `curl >= 8.9.0 <= 8.9.0`
- `curl >= 8.8.0 <= 8.8.0`
- `curl >= 8.7.1 <= 8.7.1`
- `curl >= 8.7.0 <= 8.7.0`
- `curl >= 8.6.0 <= 8.6.0`
- `curl >= 8.5.0 <= 8.5.0`
- `curl >= 8.4.0 <= 8.4.0`
- `curl >= 8.3.0 <= 8.3.0`
- `curl >= 8.2.1 <= 8.2.1`
- `curl >= 8.2.0 <= 8.2.0`
- `curl >= 8.1.2 <= 8.1.2`
- `curl >= 8.1.1 <= 8.1.1`
- `curl >= 8.1.0 <= 8.1.0`
- `curl >= 8.0.1 <= 8.0.1`
- `curl >= 8.0.0 <= 8.0.0`
- `curl >= 7.88.1 <= 7.88.1`
- `curl >= 7.88.0 <= 7.88.0`
- `curl >= 7.87.0 <= 7.87.0`
- `curl >= 7.86.0 <= 7.86.0`
- `curl >= 7.85.0 <= 7.85.0`
- `curl >= 7.84.0 <= 7.84.0`
- `curl >= 7.83.1 <= 7.83.1`
- `curl >= 7.83.0 <= 7.83.0`
- `curl >= 7.82.0 <= 7.82.0`
- `curl >= 7.81.0 <= 7.81.0`
- `curl >= 7.80.0 <= 7.80.0`
- `curl >= 7.79.1 <= 7.79.1`
- `curl >= 7.79.0 <= 7.79.0`
- `curl >= 7.78.0 <= 7.78.0`
- `curl >= 7.77.0 <= 7.77.0`
- `curl >= 7.76.1 <= 7.76.1`
- `curl >= 7.76.0 <= 7.76.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.