OpenLDAP SASL authentication bypass
Summary
| CVE | CVE-2026-13608 |
|---|---|
| State | PUBLISHED |
| Assigner | curl |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-06 18:17:19 UTC |
| Updated | 2026-09-15 07:16:26 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 7.4 HIGH from ADP
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS: 0.006440000 probability, percentile 0.489610000 (date 2026-09-14)
Problem Types: CWE-923 | CWE-923 Improper Restriction of Communication Channel to Intended Endpoints | CWE-923 CWE-923 Improper Restriction of Communication Channel to Intended Endpoints
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | ADP | DECLARED | 7.4 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
| 3.1 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary | 7.4 | HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
HighAvailability
NoneCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Curl | Curl | affected 7.82.0 8.14.2 semver | Not specified |
| CNA | Curl | Curl | affected 8.15.0 8.16.1 semver | Not specified |
| CNA | Curl | Curl | affected 8.17.0 8.20.1 semver | Not specified |
| CNA | Curl | Curl | affected 8.21.0 8.22.0 semver | Not specified |
| CNA | Curl | Curl | affected eeca818b1e8d1e61c2d4d833aed56ce4c510a9d4 ea71c3b6b60e563651ea8596a975aef0c8199519 git | Not specified |
| CNA | Curl | Curl | affected 8.21.0 | Not specified |
| CNA | Curl | Curl | affected 8.20.0 | Not specified |
| CNA | Curl | Curl | affected 8.19.0 | Not specified |
| CNA | Curl | Curl | affected 8.18.0 | Not specified |
| CNA | Curl | Curl | affected 8.17.0 | Not specified |
| CNA | Curl | Curl | affected 8.16.0 | Not specified |
| CNA | Curl | Curl | affected 8.15.0 | Not specified |
| CNA | Curl | Curl | affected 8.14.1 | Not specified |
| CNA | Curl | Curl | affected 8.14.0 | Not specified |
| CNA | Curl | Curl | affected 8.13.0 | Not specified |
| CNA | Curl | Curl | affected 8.12.1 | Not specified |
| CNA | Curl | Curl | affected 8.12.0 | Not specified |
| CNA | Curl | Curl | affected 8.11.1 | Not specified |
| CNA | Curl | Curl | affected 8.11.0 | Not specified |
| CNA | Curl | Curl | affected 8.10.1 | Not specified |
| CNA | Curl | Curl | affected 8.10.0 | Not specified |
| CNA | Curl | Curl | affected 8.9.1 | Not specified |
| CNA | Curl | Curl | affected 8.9.0 | Not specified |
| CNA | Curl | Curl | affected 8.8.0 | Not specified |
| CNA | Curl | Curl | affected 8.7.1 | Not specified |
| CNA | Curl | Curl | affected 8.7.0 | Not specified |
| CNA | Curl | Curl | affected 8.6.0 | Not specified |
| CNA | Curl | Curl | affected 8.5.0 | Not specified |
| CNA | Curl | Curl | affected 8.4.0 | Not specified |
| CNA | Curl | Curl | affected 8.3.0 | Not specified |
| CNA | Curl | Curl | affected 8.2.1 | Not specified |
| CNA | Curl | Curl | affected 8.2.0 | Not specified |
| CNA | Curl | Curl | affected 8.1.2 | Not specified |
| CNA | Curl | Curl | affected 8.1.1 | Not specified |
| CNA | Curl | Curl | affected 8.1.0 | Not specified |
| CNA | Curl | Curl | affected 8.0.1 | Not specified |
| CNA | Curl | Curl | affected 8.0.0 | Not specified |
| CNA | Curl | Curl | affected 7.88.1 | Not specified |
| CNA | Curl | Curl | affected 7.88.0 | Not specified |
| CNA | Curl | Curl | affected 7.87.0 | Not specified |
| CNA | Curl | Curl | affected 7.86.0 | Not specified |
| CNA | Curl | Curl | affected 7.85.0 | Not specified |
| CNA | Curl | Curl | affected 7.84.0 | Not specified |
| CNA | Curl | Curl | affected 7.83.1 | Not specified |
| CNA | Curl | Curl | affected 7.83.0 | Not specified |
| CNA | Curl | Curl | affected 7.82.0 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| curl.se/docs/CVE-2026-13608.html | 2499f714-1537-4658-8207-48ae4bb9eae9 | curl.se | Patch, Vendor Advisory |
| curl.se/docs/CVE-2026-13608.json | 2499f714-1537-4658-8207-48ae4bb9eae9 | curl.se | Vendor Advisory |
| hackerone.com/reports/3822248 | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | hackerone.com | Exploit, Third Party Advisory |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Eunsoo Kim (Autonomous Code Security team at Microsoft) (en)
CNA: Eunsoo Kim (en)
There are currently no legacy QID mappings associated with this CVE.