CVE-2026-13608 - Vulnerability Details - OpenCVE

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.

Exploitation poc

Automatable no

Technical Impact total

Vendors	Products
Curl	Curl

No data.

No data.

References

Link	Providers
https://curl.se/docs/CVE-2026-13608.html
https://curl.se/docs/CVE-2026-13608.json
https://hackerone.com/reports/3822248

History

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		https://curl.se/docs/CVE-2026-13608.html https://curl.se/docs/CVE-2026-13608.json https://hackerone.com/reports/3822248

MITRE

Status: PUBLISHED

Assigner: curl

Published: 2026-09-06T17:47:01.951Z

Updated: 2026-09-08T15:39:45.194Z

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

Link: CVE-2026-13608

Vulnrichment

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

NVD

Status : Undergoing Analysis

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

Modified: 2026-09-08T16:18:00.317

Link: CVE-2026-13608

Redhat

No data.

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An attacker executing a Man-in-the-Middle (MITM)\nattack can inject a premature or shortcut response that bypasses complete peer\nvalidation."}], "problemTypes": [{"descriptions": [{"lang": "en", "description": "CWE-923 Improper Restriction of Communication Channel to Intended Endpoints"}]}], "providerMetadata": {"orgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "shortName": "curl", "dateUpdated": "2026-09-06T17:47:01.951Z"}}}, "cveMetadata": {"cveId": "CVE-2026-13608", "state": "PUBLISHED", "dateUpdated": "2026-09-08T15:39:45.194Z", "dateReserved": "2026-06-29T08:57:44.945Z", "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9", "datePublished": "2026-09-06T17:47:01.951Z", "assignerShortName": "curl"}, "dataVersion": "5.2"}

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An attacker executing a Man-in-the-Middle (MITM)\nattack can inject a premature or shortcut response that bypasses complete peer\nvalidation."}], "id": "CVE-2026-13608", "lastModified": "2026-09-08T16:18:00.317", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 5.2, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-13608", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-09-08T15:39:09.395825Z", "version": "2.0.3"}}]}, "published": "2026-09-06T18:17:19.810", "references": [{"source": "2499f714-1537-4658-8207-48ae4bb9eae9", "url": "https://curl.se/docs/CVE-2026-13608.html"}, {"source": "2499f714-1537-4658-8207-48ae4bb9eae9", "url": "https://curl.se/docs/CVE-2026-13608.json"}, {"source": "2499f714-1537-4658-8207-48ae4bb9eae9", "url": "https://hackerone.com/reports/3822248"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://hackerone.com/reports/3822248"}], "sourceIdentifier": "2499f714-1537-4658-8207-48ae4bb9eae9", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-923"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}