TI-2026-09063 Aliases CVE-2026-10536 GHSA-wjq8-x4qm-6mmh

HTTP/2 stream-dependency tree UAF

HIGH 82CWE-416Published 2026-07-03 · Updated 2026-09-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Partial Red Hat: 5 fixed, 2 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via `CURLOPT_STREAM_DEPENDS` or `CURLOPT_STREAM_DEPENDS_E`, subsequently invokes `curl_easy_reset()`, and finally terminates the handle with `curl_easy_cleanup()`. During this final cleanup phase, libcurl attempts to access and modify an internal structure that was already freed during the reset operation.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00598 48th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Partial curl (curl): 8.14.2, 8.16.1, 8.20.1Red Hat: 4 advisoriesRed Hat: 5 fixed, 2 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	7.88.0 to before 8.14.2; 8.15.0 to before 8.16.1; 8.17.0 to before 8.20.1	8.14.2, 8.16.1, 8.20.1	Patch available	CNA
curl	curl	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	—	No fix listed	CNA

curl Vendorcurl Affected 7.88.0 to before 8.14.2; 8.15.0 to before 8.16.1; 8.17.0 to before 8.20.1 Fixed in 8.14.2, 8.16.1, 8.20.1 Patch available CNA
curl Vendorcurl Affected 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 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:haxx:curl::::::::	7.88.0 to before 8.21.0	Vulnerable	Haxx

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:* Versions 7.88.0 to before 8.21.0 Vulnerable ·Haxx

Remediation

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

Red Hat 4 advisories

RHSA-2026:87400 Released 2026-10-21 · Red Hat rating Important
Red Hat Cost Management On-Premise container image update
- Red Hat Cost Management On-Premise 1 registry.redhat.io/costmanagement/costmanagement-ui-rhel10
RHSA-2026:80512 Released 2026-10-12 · Red Hat rating Moderate
curl security update
- Red Hat Enterprise Linux AppStream (v. 10) libcurl-devel-8.12.1-4.el10_2.7
- Red Hat Enterprise Linux BaseOS (v. 10) curl-8.12.1-4.el10_2.7, libcurl-8.12.1-4.el10_2.7, libcurl-minimal-8.12.1-4.el10_2.7
RHSA-2026:56869 Released 2026-08-19 · Red Hat rating Important
Red Hat JBoss Core Services Apache HTTP Server 2.4.62 SP5 security update
- Red Hat JBoss Core Services 2.4.62.SP5

Show 1 more Red Hat advisories

RHSA-2026:41240 Released 2026-07-17 · Red Hat rating Moderate
Red Hat Hardened Images RPMs Security Update
- Red Hat Hardened Images curl-8.21.0-0.1.1.hum1@aarch64, curl-8.21.0-0.1.1.hum1@src, curl-8.21.0-0.1.1.hum1@x86_64 +6

Fixed in the same release

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

Release · 2026-07-03
curl 8.14.2, 8.16.1, 8.20.1
13 records Highest priority Priority HIGH 12 HIGH, 1 MEDIUM
Other records, highest priority first
- TI-2026-10231 cross-origin Digest auth state leakPriority HIGH 82
- TI-2026-07976 stale proxy password leakPriority HIGH 82
- TI-2026-07844 trailing dot domain super cookiePriority HIGH 80
Show all 13 records →

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Red Hat Enterprise Linux 10	Affected	No fix yet
Red Hat JBoss Core Services	Affected	No fix planned: Will not fix
Red Hat Cost Management On-Premise 1	Fixed	RHSA-2026:87400
Red Hat Enterprise Linux AppStream (v. 10)	Fixed	RHSA-2026:80512
Red Hat Enterprise Linux BaseOS (v. 10)	Fixed	RHSA-2026:80512
Red Hat Hardened Images	Fixed	RHSA-2026:41240
Red Hat JBoss Core Services 2.4.62.SP5	Fixed	RHSA-2026:56869

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 Trusted Profile Analyzer

Timeline

2026-10-02 Threatist record created from CVE-2026-10536
2026-10-03 Alias added: GHSA-wjq8-x4qm-6mmh
2026-10-09 Fix available: RHSA-2026:56869 · Red Hat
2026-10-09 Fix available: Red Hat JBoss Core Services 2.4.62.SP5 · Red Hat
2026-10-12 Fix available: RHSA-2026:80512 · Red Hat
2026-10-12 Fix available: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux BaseOS (v. 10) · Red Hat
2026-10-22 Fix available: RHSA-2026:87400 · Red Hat
2026-10-23 Fix available: Red Hat Cost Management On-Premise 1 · Red Hat
2026-10-30 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-2026-07976 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