Name: CVE-2026-13608: Improper Restriction of Communication Channel to Intended Endpoints
Creator: Rapid7
Published: 2026-09-06T00:00:00.000Z
License: https://www.rapid7.com/legal/website-terms-of-use/
Keywords: CVE, CVE-2026-13608, CWE-923, CVSS 7.4, EPSS 0.00479

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.

CVSS Details

CVSS 3.1 Base Score: 7.4
CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N)

Covered by Rapid7

Product	Vendor Advisory	Solution File	Added	Published
Alpine Linux	—	Upgrade curl	Sep 7, 2026	Sep 6, 2026
Ibm Aix	—	Apply the fix or workaround for curl_advisory13	Oct 15, 2026	Oct 14, 2026
Ubuntu	—	Upgrade libcurl4-openssl-dev (Ubuntu Pro)Upgrade libcurl3 (Ubuntu Pro)Upgrade curlUpgrade libcurl3t64-gnutlsUpgrade libcurl4-gnutls-devUpgrade libcurl4-nss-devUpgrade libcurl4-openssl-devUpgrade libcurl3-nss (Ubuntu Pro)Upgrade curl (Ubuntu Pro)Upgrade libcurl4t64Upgrade libcurl3-nssUpgrade libcurl3-gnutls (Ubuntu Pro)Upgrade libcurl4 (Ubuntu Pro)Upgrade libcurl3-gnutlsUpgrade libcurl4-nss-dev (Ubuntu Pro)Upgrade libcurl4Upgrade libcurl4-gnutls-dev (Ubuntu Pro)	Sep 27, 2026	Sep 24, 2026
Vmware Photon_os	—	Use 'tdnf update' to upgrade all packages to the latest version.	Sep 24, 2026	Sep 6, 2026

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CVSS Details

Covered by Rapid7

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