---
id: CVE-2026-107928
title: 'curl: curl: info leak uploading over WebSockets with GnuTLS (CVE-2026-107928)'
summary: >-
  A flaw was found in curl. When curl is built with the GnuTLS library, a
  blocked transmission during communication with a malicious WebSocket server
  can trigger an out-of-bounds memory read. A malicious server can exploit this
  flaw to expos…
severity: medium
cvss: 4.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L'
cvssSource: vendor
cwe: CWE-126
vendor: Red Hat
product: Red Hat Hardened Images
affected:
  - hardened_images
patched:
  - hardened_images
published: '2026-10-14'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T00:38:20+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-107928.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-107928.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-107928'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2550720'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-107928'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107928'
  - url: 'https://access.redhat.com/errata/RHSA-2026:82895'
  - url: 'https://curl.se/docs/CVE-2026-107928.json'
    label: json
  - url: 'https://curl.se/docs/CVE-2026-107928.html'
    label: www
  - url: 'https://hackerone.com/reports/4099194'
    label: issue
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00293
epssPercentile: 0.21698
ingestedAt: '2026-10-20T21:19:21.269Z'
---

## Overview

A flaw was found in curl. When curl is built with the GnuTLS library, a blocked transmission during communication with a malicious WebSocket server can trigger an out-of-bounds memory read. A malicious server can exploit this flaw to expose sensitive data from neighboring memory buffers or crash the client, leading to information disclosure or a Denial of Service (DoS).

## Vendor advisories

- **RHSA-2026:82895** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-14 · [advisory](https://access.redhat.com/errata/RHSA-2026:82895)

**curl: curl: info leak uploading over WebSockets with GnuTLS** — rated Low by Red Hat. Released 2026-10-14, updated 2026-10-23.

Fixed:

- Red Hat Hardened Images

Not affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat Hardened Images
- Red Hat JBoss Core Services
- Red Hat Satellite 6

## Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to:
https://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:82895