---
id: CVE-2026-13608
title: |-
  A flaw in the libcurl SASL negotiation for LDAP authentication allows an
  incomplete handshake sequence to be misinterpreted as a successful
  cryptographic verification
summary: |-
  A flaw in the libcurl SASL negotiation for LDAP authentication allows an
  incomplete handshake sequence to be misinterpreted as a successful
  cryptographic verification. An attacker executing a Man-in-the-Middle (MITM)
  attack can inject a …
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-923
  - CWE-347
vendor: haxx
product: curl
affected:
  - 'curl >= 7.82.0, < 8.22.0'
patched:
  - curl 8.22.0
published: '2026-09-06'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T07:16:26.353'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-13608'
references:
  - url: 'https://curl.se/docs/CVE-2026-13608.html'
    label: 2499f714-1537-4658-8207-48ae4bb9eae9
  - url: 'https://curl.se/docs/CVE-2026-13608.json'
    label: 2499f714-1537-4658-8207-48ae4bb9eae9
  - url: 'https://hackerone.com/reports/3822248'
    label: 2499f714-1537-4658-8207-48ae4bb9eae9
  - url: 'https://hackerone.com/reports/3822248'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-13608.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-13608'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2529198'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-13608'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-13608'
  - url: 'https://access.redhat.com/errata/RHSA-2026:63514'
  - url: 'https://access.redhat.com/errata/RHSA-2026:63161'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
  - score-dispute
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-08T15:39:09.395825Z'
epss: 0.00479
epssPercentile: 0.38664
ingestedAt: '2026-09-07T09:08:15.325Z'
scores:
  nvd: 7.4
  vendor: 3.7
---

## Overview

A flaw in the libcurl SASL negotiation for LDAP authentication allows an
incomplete handshake sequence to be misinterpreted as a successful
cryptographic verification. An attacker executing a Man-in-the-Middle (MITM)
attack can inject a premature or shortcut response that bypasses complete peer
validation.

## Affected

- `curl >= 7.82.0, < 8.22.0`

## Remediation

Upgrade past the affected range:

- `curl 8.22.0`

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Hardened Images, Red Hat Satellite 6 · no fix planned: Red Hat Satellite 6, Red Hat Enterprise Linux 10, Red Hat Hardened Images · updated 2026-09-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-13608.json)
- **RHSA-2026:63514** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-04 · [advisory](https://access.redhat.com/errata/RHSA-2026:63514)
- **RHSA-2026:63161** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:63161)