High severity · published Sep 6, 2026
CVE-2026-13608
OpenLDAP SASL authentication bypass
7.4
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 43% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CU
curl · curl
7.82.0 before 8.14.2; 8.15.0 before 8.16.1; 8.17.0 before 8.20.1; 8.21.0 before 8.22.0; eeca818b1e8d1e61c2d4d833aed56ce4c510a9d4 before ea71c3b6b60e563651ea8596a975aef0c8199519; 8.21.0; +34 more · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-13608
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-13608
Patch
https://curl.se/docs/CVE-2026-13608.html
Vendor Advisory
https://curl.se/docs/CVE-2026-13608.json
Exploit
https://hackerone.com/reports/3822248
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