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Fencer Vulns
high 7.4

CVE-2026-13608 json

OpenLDAP SASL authentication bypass

published 2026-09-06 2 mo ago modified 2026-09-15 55 d ago also EUVD-2026-72164

cvss
7.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 43%
public exploits
0
none known

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 premature or shortcut response that bypasses complete peer validation.

Patch / fix

  • curl curl 8.14.2, 8.16.1, 8.20.1, 8.22.0
  • curl Debian 14 8.22.0~rc2-1

debian advisories DEBIAN-CVE-2026-13608

  • curl Ubuntu 24.04 LTS 8.5.0-2ubuntu10.15
  • curl Ubuntu 26.10 8.20.0-2ubuntu11
  • curl Ubuntu 26.04 LTS 8.18.0-1ubuntu2.7

ubuntu advisories UBUNTU-CVE-2026-13608

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • rust hummingbird 1 1.98.0-1.hum1
  • cargo hummingbird 1 1.98.0-1.hum1
  • clippy hummingbird 1 1.98.0-1.hum1
  • rustfmt hummingbird 1 1.98.0-1.hum1
  • rust-gdb hummingbird 1 1.98.0-1.hum1
  • rust-src hummingbird 1 1.98.0-1.hum1
  • rust-lldb hummingbird 1 1.98.0-1.hum1
  • rust-analyzer hummingbird 1 1.98.0-1.hum1

red hat advisories RHSA-2026:63514RHSA-2026:63161

  • curl SLE Module for Basesystem 15 SP7 8.14.1-150700.7.26.1
  • curl SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 8.14.1-160000.9.1
  • curl-mini SLES for SAP applications 16.0, SLES 16.0 8.14.1-160000.9.1
  • curl Linux Micro 6.1 8.14.1-slfo.1.1_10.1
  • curl SLE Micro 5.5, SLE Micro 5.4, SLE Micro 5.3 8.14.1-150400.5.91.1
  • curl SLES LTSS Extended Security 12 SP5 8.0.1-11.129.1
  • curl SLES for SAP 15 SP6, SLES 15 SP6-LTSS 8.14.1-150600.4.51.1

suse advisories SUSE-SU-2026:4071-1SUSE-SU-2026:4048-1SUSE-SU-2026:4047-1SUSE-SU-2026:23498-1SUSE-SU-2026:23638-1SUSE-SU-2026:23521-1

  • curl openSUSE Tumbleweed 8.22.0-1.1
  • curl openSUSE Leap 16.0 8.14.1-160000.9.1

opensuse advisories openSUSE-SU-2026:11696-1openSUSE-SU-2026:21774-1

  • curl Alpine 3.24, Alpine 3.23 8.22.0-r0

alpine advisories ALPINE-CVE-2026-13608

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • curl Azure Linux 3.0 8.11.1-12

azure linux advisories AZL-99762

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-13608 updated cvss 3.7

curl: curl: Authentication bypass in OpenLDAP SASL negotiation via Man-in-the-Middle (MITM) attack

  • Red Hat Enterprise Linux 10 curl
    affected: workaround, no fix available
  • Red Hat Satellite 6 puppet-agent, openvox-agent
    affected: workaround, no fix available “Fix deferred”
  • Red Hat Hardened Images rust 1.98.0-1.hum1, cargo 1.98.0-1.hum1, clippy 1.98.0-1.hum1, curl 8.22.0-0.1.hum1, rustfmt 1.98.0-1.hum1, rust-gdb 1.98.0-1.hum1, +14 more
    fixed: vendor fix RHSA-2026:63514
  • Red Hat Confidential Compute Attestation build-of-trustee/trustee-rhel9, openshift-sandboxed-containers/osc-podvm-payload-rhel9 Red Hat Enterprise Linux 6 curl, libcurl Red Hat Enterprise Linux 7 curl, libcurl Red Hat Enterprise Linux 8 curl, libcurl, libcurl-minimal Red Hat Enterprise Linux 9 curl, rust, cargo, clippy, libcurl, rustfmt, +13 more Red Hat Enterprise Linux 10 igvm, rust, snphost, trustee, s390utils
    +1 more products
    Red Hat Enterprise Linux AI (RHEL AI) 3 rust
    not affected: vulnerable code not present
  • Red Hat Hardened Images openshell
    not affected: component not present
  • Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9 Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9 Red Hat OpenShift Dev Spaces devspaces/code-rhel9 Red Hat Satellite 6 foreman, foreman-cli, foreman-ec2, foreman-gce, foreman-ovirt, foreman-vmware, +9 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
2 mo ago

Exploit prediction

0.50% chance of exploitation in the next 30 days, higher than 43% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • hackerone.com https://hackerone.com/reports/3822248 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CNA 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

  • curl curl

Classification

Weakness
  • CWE-923 Improper Restriction of Communication Channel to Intended Endpoints

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.