CVE-2026-13608

OpenLDAP SASL authentication bypass

CVE-2026-13608 is fixed in 11 products on 1 platform, first by curl 8.18.0-1ubuntu2.7, released September 6, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.4

Low

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0050

43rd percentile

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.

Where it's fixed

Product	Fixed in	Fix	Released
Linux
curl · Debian 14	8.22.0~rc2-1	DEBIAN-CVE-2026-13608	Sep 19, 2026
curl · Fedora 43	8.15.0-12.fc43	FEDORA-2026-D65DA12723	Nov 7, 2026
curl · Ubuntu 24.04.5 LTS (noble)	8.5.0-2ubuntu10.15	curl 8.5.0-2ubuntu10.15	Sep 28, 2026
curl · Ubuntu 26.04.1 LTS (resolute)	8.18.0-1ubuntu2.7	curl 8.18.0-1ubuntu2.7	Sep 6, 2026
curl · opensuse-leap 16.0	8.14.1-160000.9.1	OPENSUSE-SU-2026:21774-1	Sep 6, 2026
curl · sles 15.6	8.14.1-150600.4.51.1	SUSE-SU-2026:4047-1	Sep 7, 2026
curl · sles 15.7	8.14.1-150700.7.26.1	SUSE-SU-2026:4048-1	Sep 7, 2026
curl · sles 16.0	8.14.1-160000.9.1	SUSE-SU-2026:23638-1	Sep 6, 2026
curl-debuginfo · Fedora 43	8.15.0-12.fc43	FEDORA-2026-D65DA12723	Nov 7, 2026
curl-debugsource · Fedora 43	8.15.0-12.fc43	FEDORA-2026-D65DA12723	Nov 7, 2026
curl-mini · sles 16.0	8.14.1-160000.9.1	SUSE-SU-2026:23638-1	Sep 6, 2026
libcurl · Fedora 43	8.15.0-12.fc43	FEDORA-2026-D65DA12723	Nov 7, 2026
libcurl-debuginfo · Fedora 43	8.15.0-12.fc43	FEDORA-2026-D65DA12723	Nov 7, 2026
libcurl-devel · Fedora 43	8.15.0-12.fc43	FEDORA-2026-D65DA12723	Nov 7, 2026
libcurl-minimal · Fedora 43	8.15.0-12.fc43	FEDORA-2026-D65DA12723	Nov 7, 2026
libcurl-minimal-debuginfo · Fedora 43	8.15.0-12.fc43	FEDORA-2026-D65DA12723	Nov 7, 2026
libcurl3t64-gnutls · Ubuntu 24.04.5 LTS (noble)	8.5.0-2ubuntu10.15	libcurl3t64-gnutls 8.5.0-2ubuntu10.15	Sep 28, 2026
libcurl3t64-gnutls · Ubuntu 26.04.1 LTS (resolute)	8.18.0-1ubuntu2.7	libcurl3t64-gnutls 8.18.0-1ubuntu2.7	Sep 6, 2026
libcurl4t64 · Ubuntu 24.04.5 LTS (noble)	8.5.0-2ubuntu10.15	libcurl4t64 8.5.0-2ubuntu10.15	Sep 28, 2026
libcurl4t64 · Ubuntu 26.04.1 LTS (resolute)	8.18.0-1ubuntu2.7	libcurl4t64 8.18.0-1ubuntu2.7	Sep 6, 2026

Details

Published
September 6, 2026
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-13608

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