TI-2026-11527 Aliases CVE-2026-13608 GHSA-3968-82gf-vhpr

OpenLDAP SASL authentication bypass

HIGH 68CWE-923Published 2026-09-06 · Updated 2026-09-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: —
Confidentiality · integrity · availability: High · High · None
Fix status: Partial Red Hat: 1 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.005 43rd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Partial curl (curl): 8.14.2, 8.16.1, 8.20.1 +1Red Hat: 2 advisoriesRed Hat: 1 fixed, 2 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
curl	curl	7.82.0 to before 8.14.2; 8.15.0 to before 8.16.1; 8.17.0 to before 8.20.1; 8.21.0 to before 8.22.0	8.14.2, 8.16.1, 8.20.1, 8.22.0	Patch available	CNA
curl	curl	8.21.0; 8.20.0; 8.19.0; 8.18.0; 8.17.0; 8.16.0; 8.15.0; 8.14.1; 8.14.0; 8.13.0; 8.12.1; 8.12.0; 8.11.1; 8.11.0; 8.10.1; 8.10.0; 8.9.1; 8.9.0; 8.8.0; 8.7.1; 8.7.0; 8.6.0; 8.5.0; 8.4.0; 8.3.0; 8.2.1; 8.2.0; 8.1.2; 8.1.1; 8.1.0; 8.0.1; 8.0.0; 7.88.1; 7.88.0; 7.87.0; 7.86.0; 7.85.0; 7.84.0; 7.83.1; 7.83.0; 7.82.0	—	No fix listed	CNA

curl Vendorcurl Affected 7.82.0 to before 8.14.2; 8.15.0 to before 8.16.1; 8.17.0 to before 8.20.1; 8.21.0 to before 8.22.0 Fixed in 8.14.2, 8.16.1, 8.20.1, 8.22.0 Patch available CNA
curl Vendorcurl Affected 8.21.0; 8.20.0; 8.19.0; 8.18.0; 8.17.0; 8.16.0; 8.15.0; 8.14.1; 8.14.0; 8.13.0; 8.12.1; 8.12.0; 8.11.1; 8.11.0; 8.10.1; 8.10.0; 8.9.1; 8.9.0; 8.8.0; 8.7.1; 8.7.0; 8.6.0; 8.5.0; 8.4.0; 8.3.0; 8.2.1; 8.2.0; 8.1.2; 8.1.1; 8.1.0; 8.0.1; 8.0.0; 7.88.1; 7.88.0; 7.87.0; 7.86.0; 7.85.0; 7.84.0; 7.83.1; 7.83.0; 7.82.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:haxx:curl::::::::	7.82.0 to before 8.22.0	Vulnerable	Haxx

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:* Versions 7.82.0 to before 8.22.0 Vulnerable ·Haxx

Remediation

Fix · CNA curl (curl) Fixed in 8.14.2, 8.16.1, 8.20.1, 8.22.0

Red Hat 2 advisories

RHSA-2026:63514 Released 2026-09-04 · Red Hat rating Moderate
Red Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images cargo-1.98.0-1.hum1@aarch64, cargo-1.98.0-1.hum1@x86_64, clippy-1.98.0-1.hum1@aarch64 +36
RHSA-2026:63161 Released 2026-09-03 · Red Hat rating Moderate
Red Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images curl-8.22.0-0.1.hum1@aarch64, curl-8.22.0-0.1.hum1@src, curl-8.22.0-0.1.hum1@x86_64 +6

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2026-09-06
curl 8.14.2, 8.16.1 and 2 more versions
9 records Highest priority Priority HIGH 8 HIGH, 1 MEDIUM
Other records, highest priority first
- TI-2026-16162 Negotiate ambient user conn reusePriority HIGH 82
- TI-2026-15472 HTTP/2 server push UAFPriority HIGH 78
- TI-2026-56683 domain-scoped PSL domain cookiePriority HIGH 75
Show all 9 records →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet
Red Hat Satellite 6	Affected	No fix yet: Fix deferred
Red Hat Hardened Images	Fixed	RHSA-2026:63161, RHSA-2026:63514

Not affected: 12 products

Confidential Compute Attestation
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
Red Hat Enterprise Linux AI (RHEL AI) 3
Red Hat Hardened Images
Red Hat OpenShift Container Platform 4
Red Hat OpenShift Container Platform 5
Red Hat OpenShift Dev Spaces
Red Hat Satellite 6

Timeline

2026-10-02 Threatist record created from CVE-2026-13608
2026-10-03 Alias added: GHSA-3968-82gf-vhpr
2026-11-01 Affected versions changed · Red Hat

References

TI-2023-19922 Out-of-bounds write in curl CVSS 3.1CRITICAL 9.8
TI-2026-16162 Negotiate ambient user conn reuse CVSS 3.1CRITICAL 9.8
TI-2026-10231 cross-origin Digest auth state leak CVSS 3.1CRITICAL 9.8
TI-2026-09063 HTTP/2 stream-dependency tree UAF CVSS 3.1CRITICAL 9.8
TI-2026-07976 stale proxy password leak CVSS 3.1CRITICAL 9.8
TI-2026-07845 SASL double-free CVSS 3.1CRITICAL 9.8

See all 103 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences