Vulnerability · Published Sep 6, 2026 · Assigned by curl
CVE-2026-13608OpenLDAP SASL authentication bypass
High 7.4
In plain English
A high-severity security flaw in curl from curl. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 43% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)7.4High
Exploit odds (30 days)0.5%top 56.9% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official 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 packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine:v3.23 | curl | 8.22.0-r0 | ALPINE-CVE-2026-13608 |
| Alpine:v3.24 | curl | 8.22.0-r0 | ALPINE-CVE-2026-13608 |
| Debian:12 | curl | no fix listed | DEBIAN-CVE-2026-13608 |
| Debian:13 | curl | no fix listed | DEBIAN-CVE-2026-13608 |
| Debian:14 | curl | 8.22.0~rc2-1 | DEBIAN-CVE-2026-13608 |
| Ubuntu:22.04:LTS | curl | 7.81.0-1ubuntu1.29 | USN-8820-1 |
| Ubuntu:24.04:LTS | curl | 8.5.0-2ubuntu10.15 | USN-8820-1 |
| Ubuntu:24.04:LTS | curl | 8.5.0-2ubuntu10.15 | UBUNTU-CVE-2026-13608 |
| Ubuntu:26.04:LTS | curl | 8.18.0-1ubuntu2.7 | USN-8820-1 |
| Ubuntu:26.04:LTS | curl | 8.18.0-1ubuntu2.7 | UBUNTU-CVE-2026-13608 |
| Ubuntu:26.10 | curl | 8.20.0-2ubuntu11 | UBUNTU-CVE-2026-13608 |
Affected products (as reported)
Weakness: CWE-923 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N