OpenLDAP SASL authentication bypass

Summary

CVECVE-2026-13608
StatePUBLISHED
Assignercurl
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-06 18:17:19 UTC
Updated2026-09-15 07:16:26 UTC
DescriptionA 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


VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS: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)

TypeVendorProductVersionUpdateEditionLanguage
Application Haxx Curl All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
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

ReferenceSourceLinkTags
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)

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