TI-2026-10395 Aliases CVE-2026-12064 GHSA-jm94-9f7h-36pr

proto-default skips SSH verification

HIGH 72CWE-297Published 2026-07-03 · Updated 2026-09-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Spoofing
Confidentiality · integrity · availability: None · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-295.

Summary

When a user invokes curl using a schemeless URL combined with `--proto-default` sftp (or scp), a disconnect occurs between the tool layer and libcurl. The tool layer incorrectly infers the URL scheme, which erroneously bypasses the initialization of critical SSH security options like CURLOPT_SSH_HOST_PUBLIC_KEY_SHA256 and CURLOPT_SSH_KNOWNHOSTS. Conversely, the libcurl runtime successfully honors CURLOPT_DEFAULT_PROTOCOL and establishes the connection via SFTP/SCP as specified. Because the tool layer skipped the security configuration, these SSH host verification options are silently omitted, causing curl to connect to an unverified SSH remote host without throwing an error.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00414 35th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed curl (curl): 8.14.2, 8.16.1, 8.20.1Red Hat: 5 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

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	7.81.0 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; 7.87.0; 7.86.0; 7.85.0; 7.84.0; 7.83.1; 7.83.0; 7.82.0; 7.81.0	—	No fix listed	CNA

curl Vendorcurl Affected 7.81.0 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; 7.87.0; 7.86.0; 7.85.0; 7.84.0; 7.83.1; 7.83.0; 7.82.0; 7.81.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:haxx:curl::::::::	7.81.0 to before 8.21.0	Vulnerable	Haxx

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:* Versions 7.81.0 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 5 advisories

RHSA-2026:72506 Released 2026-09-28 · Red Hat rating Important
curl security update
- Red Hat Enterprise Linux AppStream EUS (v. 10.0) libcurl-devel-8.12.1-1.el10_0.10
- Red Hat Enterprise Linux BaseOS EUS (v. 10.0) curl-8.12.1-1.el10_0.10, libcurl-8.12.1-1.el10_0.10, libcurl-minimal-8.12.1-1.el10_0.10
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
RHSA-2026:55450 Released 2026-08-17 · Red Hat rating Important
curl security update
- Red Hat Enterprise Linux AppStream (v. 10) libcurl-devel-8.12.1-4.el10_2.3
- Red Hat Enterprise Linux BaseOS (v. 10) curl-8.12.1-4.el10_2.3, libcurl-8.12.1-4.el10_2.3, libcurl-minimal-8.12.1-4.el10_2.3

Show 2 more Red Hat advisories

RHSA-2026:34975 Released 2026-07-02 · Red Hat rating Important
Red Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images cargo-1.96.1-1.hum1@aarch64, cargo-1.96.1-1.hum1@x86_64, clippy-1.96.1-1.hum1@aarch64 +36
RHSA-2026:29017 Released 2026-06-24 · Red Hat rating Important
Red Hat Hardened Images RPMs bug fix and enhancement update
- Red Hat Hardened Images curl-8.21.0-0.1.hum1@aarch64, curl-8.21.0-0.1.hum1@src, curl-8.21.0-0.1.hum1@x86_64 +6

Fixed in the same release

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

Release · 2026-07-03
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-2026-09063 HTTP/2 stream-dependency tree UAFPriority HIGH 82
- TI-2026-07976 stale proxy password leakPriority HIGH 82
Show all 13 records →

Vendor assessments

Red Hat

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

Product	Status	Plan or fix
Red Hat Enterprise Linux AppStream (v. 10)	Fixed	RHSA-2026:55450
Red Hat Enterprise Linux AppStream EUS (v. 10.0)	Fixed	RHSA-2026:72506
Red Hat Enterprise Linux BaseOS (v. 10)	Fixed	RHSA-2026:55450
Red Hat Enterprise Linux BaseOS EUS (v. 10.0)	Fixed	RHSA-2026:72506
Red Hat Hardened Images	Fixed	RHSA-2026:29017, RHSA-2026:34975
Red Hat JBoss Core Services 2.4.62.SP5	Fixed	RHSA-2026:56869

Not affected: 8 products

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9
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-2026-12064
2026-10-03 Alias added: GHSA-jm94-9f7h-36pr
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
2026-10-16 Affected versions changed · 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-2026-09063 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