CVE-2026-13608

OpenLDAP SASL authentication bypass

HIGH
7.4
CVSS Score
Published: September 6, 2026 at 05:47 PM UTC
Updated: September 15, 2026 at 07:35 AM UTC
1 product affected across 1 vendorCurl

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Severity
HIGH7.4
Exploit prediction
EPSS 0.5%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Vendor states this is fixed in ea71c3b6b60e563651ea8596a975aef0c8199519 (fixed)
Affected range stops below 8.14.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.16.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.20.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.22.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

References (3)

Vendor Advisory
Source: cverecord
https://curl.se/docs/CVE-2026-13608.json
PatchVendor Advisory
Source: cverecord
https://curl.se/docs/CVE-2026-13608.html
ExploitThird Party Advisory
Source: cverecord
https://hackerone.com/reports/3822248

SSVC — Action Prioritization

SSVCPoCNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.4HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-923

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