TI-2026-16162 Aliases CVE-2026-19931 GHSA-rhw6-3rrg-mwjq

Negotiate ambient user conn reuse

HIGH 82CWE-488Published 2026-09-06 · Updated 2026-09-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: High · High · High
Fix status: Partial Red Hat: 1 fixed, 8 without a fix

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

Summary

A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given hostname using Negotiate authentication, when the initial request is done using empty credentials. This can make user B's request get sent over user A's previously authenticated connection.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00747 55th 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, 8 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
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	7.64.1 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; 7.81.0; 7.80.0; 7.79.1; 7.79.0; 7.78.0; 7.77.0; 7.76.1; 7.76.0; 7.75.0; 7.74.0; 7.73.0; 7.72.0; 7.71.1; 7.71.0; 7.70.0; 7.69.1; 7.69.0; 7.68.0; 7.67.0; 7.66.0; 7.65.3; 7.65.2; 7.65.1; 7.65.0; 7.64.1	—	No fix listed	CNA

curl Vendorcurl Affected 7.64.1 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; 7.81.0; 7.80.0; 7.79.1; 7.79.0; 7.78.0; 7.77.0; 7.76.1; 7.76.0; 7.75.0; 7.74.0; 7.73.0; 7.72.0; 7.71.1; 7.71.0; 7.70.0; 7.69.1; 7.69.0; 7.68.0; 7.67.0; 7.66.0; 7.65.3; 7.65.2; 7.65.1; 7.65.0; 7.64.1 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:haxx:curl::::::::	7.64.1 to before 8.22.0	Vulnerable	Haxx

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:* Versions 7.64.1 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-2026-15472 HTTP/2 server push UAFPriority HIGH 78
- TI-2026-56683 domain-scoped PSL domain cookiePriority HIGH 75
- TI-2026-56682 wolfSSL CA-cache hit overrides callbackPriority HIGH 72
Show all 9 records →

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Confidential Compute Attestation	Affected	No fix yet
Red Hat Enterprise Linux 10	Affected	No fix yet
Red Hat Enterprise Linux 9	Affected	No fix yet
Red Hat Enterprise Linux AI (RHEL AI) 3	Affected	No fix yet
Red Hat OpenShift AI (RHOAI)	Affected	—
Red Hat OpenShift Container Platform 4	Affected	No fix yet
Red Hat OpenShift Container Platform 5	Affected	No fix yet
Red Hat OpenShift Dev Spaces	Affected	No fix yet
Red Hat Hardened Images	Fixed	RHSA-2026:63161, RHSA-2026:63514

Not affected: 9 products

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 Hardened Images
Red Hat OpenShift AI (RHOAI)
Red Hat OpenShift Container Platform 4
Red Hat Satellite 6

Timeline

2026-10-02 Threatist record created from CVE-2026-19931
2026-10-03 Alias added: GHSA-rhw6-3rrg-mwjq
2026-10-29 Affected versions changed · Red Hat
2026-10-30 Affected versions changed · Red Hat
2026-11-06 Affected versions changed · Red Hat

References

TI-2023-19922 Out-of-bounds write in curl 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
TI-2026-77670 Credential leak in curl redirects to URLs with userinfo CVSS 3.1CRITICAL 9.1

See all 103 →

Sources

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