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.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00479.

Exploitation poc

Automatable no

Technical Impact total

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
curl curl unaffected
Version Status Constraints
7.82.0 affected < 8.14.2
8.15.0 affected < 8.16.1
8.17.0 affected < 8.20.1
8.21.0 affected < 8.22.0
curl curl unaffected
Version Status Constraints
eeca818b1e8d1e61c2d4d833aed56ce4c510a9d4 affected < ea71c3b6b60e563651ea8596a975aef0c8199519
curl curl unaffected
Version Status Constraints
8.21.0 affected —
8.20.0 affected —
8.19.0 affected —
8.18.0 affected —
8.17.0 affected —
8.16.0 affected —
8.15.0 affected —
8.14.1 affected —
8.14.0 affected —
8.13.0 affected —
8.12.1 affected —
8.12.0 affected —
8.11.1 affected —
8.11.0 affected —
8.10.1 affected —
8.10.0 affected —
8.9.1 affected —
8.9.0 affected —
8.8.0 affected —
8.7.1 affected —
8.7.0 affected —
8.6.0 affected —
8.5.0 affected —
8.4.0 affected —
8.3.0 affected —
8.2.1 affected —
8.2.0 affected —
8.1.2 affected —
8.1.1 affected —
8.1.0 affected —
8.0.1 affected —
8.0.0 affected —
7.88.1 affected —
7.88.0 affected —
7.87.0 affected —
7.86.0 affected —
7.85.0 affected —
7.84.0 affected —
7.83.1 affected —
7.83.0 affected —
7.82.0 affected —

Configuration 1 [-]

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*

No data.

OpenCVE Enrichment is a feature of OpenCVE that uses AI to automatically link vendors and products to CVEs. Learn more on GitHub.

Vendors Products
Curl Subscribe
Curl Subscribe

Project Subscriptions

Vendors Products
Curl Subscribe
Curl Subscribe
Haxx Subscribe
Curl Subscribe
Advisories
Source ID Title
Ubuntu USN Ubuntu USN USN-8820-1 curl vulnerabilities
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://curl.se/docs/CVE-2026-13608.html cve-icon cve-icon cve-icon
https://curl.se/docs/CVE-2026-13608.json cve-icon cve-icon cve-icon
https://hackerone.com/reports/3822248 cve-icon cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-13608 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-13608 cve-icon
History

Mon, 21 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-347
References
Metrics threat_severity

None

 threat_severity

Low

Fri, 11 Sep 2026 23:45:00 +0000

Type Values Removed Values Added
First Time appeared Haxx
Haxx curl
CPEs cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
Vendors & Products Haxx
Haxx curl

Tue, 08 Sep 2026 19:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Tue, 08 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-923
Metrics cvssV3_1

{'score': 7.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Sun, 06 Sep 2026 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Curl
Curl curl
Vendors & Products Curl
Curl curl

Sun, 06 Sep 2026 19:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-287

Sun, 06 Sep 2026 18:00:00 +0000

Type Values Removed Values Added
Description 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.
Title OpenLDAP SASL authentication bypass
References

Projects

Sign in to view the affected projects.

cve-icon MITRE

Status: PUBLISHED

Assigner: curl

Published:

Updated: 2026-09-15T06:02:45.788Z

Reserved: 2026-06-29T08:57:44.945Z

Link: CVE-2026-13608

cve-icon Vulnrichment

Updated: 2026-09-08T15:39:40.949Z

cve-icon NVD

Status : Modified

Published: 2026-09-06T18:17:19.810

Modified: 2026-09-15T07:16:26.353

Link: CVE-2026-13608

cve-icon Redhat

Severity : Low

Publid Date: 2026-09-06T17:47:01Z

Links: CVE-2026-13608 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-21T13:30:16Z

Weaknesses