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curl CVE-2026-6276

| EUVDEUVD-2026-29928 HIGH
Cleartext Transmission of Sensitive Information (CWE-319)
High
Disputed · 7.5 NVD
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Severity by source

Sources disagree (Low–High)
NVD PRIMARY
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SUSE
HIGH
qualitative
Red Hat
3.7 LOW
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorNVD

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

Lifecycle Timeline

4
Analysis Generated
Jun 08, 2026 - 09:54 vuln.today
CVSS changed
May 13, 2026 - 18:22 NVD
7.5 (HIGH)
CVE Published
May 08, 2026 - 06:45 nvd
UNKNOWN (no severity yet)
CVE Published
May 08, 2026 - 06:45 nvd
HIGH 7.5

Description PRE-NVD

Disclosed via oss-security. NVD scoring and full description are pending.

AnalysisAI

Cookie leakage in curl (libcurl) versions 7.71.0 through 8.19.0 allows remote servers to receive cookies intended for a different host when a stale custom cookie host value persists across requests. The flaw, tracked as CWE-319 (cleartext transmission of sensitive information), carries a CVSS 7.5 and SSVC 'partial' technical impact, with no public exploit identified at time of analysis and an EPSS of 0.01%.

Technical ContextAI

curl/libcurl is the ubiquitous HTTP(S) client library maintained by Daniel Stenberg and the curl project (CPE cpe:2.3:a:haxx:curl). The bug is in curl's cookie engine: when an application sets a custom cookie host (via CURLOPT_COOKIELIST or similar APIs) and the easy handle is reused for a subsequent request to a different host, the previously-applied custom host scoping is not properly reset. CWE-319 captures the root cause class - sensitive data (the cookie) is transmitted in cleartext context to a party not entitled to it. Because the underlying transport may still be TLS, the integrity breach is one of cookie-scope confusion rather than wire-level eavesdropping.

RemediationAI

Patch available per vendor advisory - upgrade to the fixed curl release noted in the upstream advisory at https://curl.se/docs/CVE-2026-6276.html (consult the JSON form at https://curl.se/docs/CVE-2026-6276.json for the precise fix commit and tagged version, which were not enumerated in the provided data). For distribution-managed deployments apply Red Hat RHSA-2026:12916 or the relevant SUSE updates (SUSE-SU-2026:1717/1940/21440/21452). If patching is delayed, compensating controls include avoiding reuse of curl easy handles across requests to different hosts when CURLOPT_COOKIELIST or custom cookie host values are set, calling curl_easy_reset() between such requests, or disabling persistent cookie jars in affected automation; the trade-off is reduced connection reuse and lost cookie state between requests, which can break session-bound workflows.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
Container suse/manager/4.3/proxy-httpd:4.3.17.9.76.18 Container suse/manager/4.3/proxy-salt-broker:4.3.17.9.66.20 Container suse/sle-micro-rancher/5.3:latest Container suse/sle-micro-rancher/5.4:5.4.4.5.106 Container suse/sle-micro/5.3/toolbox:16.3-6.11.222 Container suse/sle-micro/5.4/toolbox:16.3-5.19.222 Container suse/sle-micro/5.5/toolbox:16.3-3.12.133 Container suse/sle-micro/base-5.5:2.0.4-5.8.271 Image SLES15-SP4-BYOS Image SLES15-SP4-BYOS-Azure Image SLES15-SP4-BYOS-EC2 Image SLES15-SP4-BYOS-GCE Image SLES15-SP4-CHOST-BYOS Image SLES15-SP4-CHOST-BYOS-Aliyun Image SLES15-SP4-CHOST-BYOS-Azure Image SLES15-SP4-CHOST-BYOS-EC2 Image SLES15-SP4-CHOST-BYOS-GCE Image SLES15-SP4-CHOST-BYOS-SAP-CCloud Image SLES15-SP4-HPC-BYOS Image SLES15-SP4-HPC-BYOS-Azure Image SLES15-SP4-HPC-BYOS-EC2 Image SLES15-SP4-HPC-BYOS-GCE Image SLES15-SP4-HPC-EC2 Image SLES15-SP4-HPC-GCE Image SLES15-SP4-Hardened-BYOS Image SLES15-SP4-Hardened-BYOS-Azure Image SLES15-SP4-Hardened-BYOS-EC2 Image SLES15-SP4-Hardened-BYOS-GCE Image SLES15-SP4-SAP-BYOS Image SLES15-SP4-SAP-BYOS-Azure Image SLES15-SP4-SAP-BYOS-EC2 Image SLES15-SP4-SAP-BYOS-GCE Image SLES15-SP4-SAP-Hardened Image SLES15-SP4-SAP-Hardened-Azure Image SLES15-SP4-SAP-Hardened-BYOS Image SLES15-SP4-SAP-Hardened-BYOS-Azure Image SLES15-SP4-SAP-Hardened-BYOS-EC2 Image SLES15-SP4-SAP-Hardened-BYOS-GCE Image SLES15-SP4-SAP-Hardened-GCE Image SLES15-SP5-BYOS-Azure Image SLES15-SP5-BYOS-EC2 Image SLES15-SP5-BYOS-GCE Image SLES15-SP5-CHOST-BYOS-Aliyun Image SLES15-SP5-CHOST-BYOS-Azure Image SLES15-SP5-CHOST-BYOS-EC2 Image SLES15-SP5-CHOST-BYOS-GCE Image SLES15-SP5-CHOST-BYOS-GDC Image SLES15-SP5-CHOST-BYOS-SAP-CCloud Image SLES15-SP5-EC2 Image SLES15-SP5-GCE Image SLES15-SP5-HPC-BYOS-Azure Image SLES15-SP5-HPC-BYOS-EC2 Image SLES15-SP5-HPC-BYOS-GCE Image SLES15-SP5-Hardened-BYOS-Azure Image SLES15-SP5-Hardened-BYOS-EC2 Image SLES15-SP5-Hardened-BYOS-GCE Image SLES15-SP5-SAP-Azure-3P Image SLES15-SP5-SAP-BYOS-Azure Image SLES15-SP5-SAP-BYOS-EC2 Image SLES15-SP5-SAP-BYOS-GCE Image SLES15-SP5-SAP-Hardened-Azure Image SLES15-SP5-SAP-Hardened-BYOS-Azure Image SLES15-SP5-SAP-Hardened-BYOS-EC2 Image SLES15-SP5-SAP-Hardened-BYOS-GCE Image SLES15-SP5-SAP-Hardened-GCE Affected
Container suse/sl-micro/6.0/baremetal-os-container:2.1.3-6.172 Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.155 Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.168 Affected
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.139 Container suse/sl-micro/6.0/toolbox:13.2-9.105 Image SL-Micro Affected
Container suse/sl-micro/6.1/baremetal-os-container:2.2.1-7.102 Container suse/sl-micro/6.1/kvm-os-container:2.2.1-5.127 Container suse/sl-micro/6.1/rt-os-container:2.2.1-5.116 Affected
Container suse/sl-micro/6.1/base-os-container:2.2.1-5.126 Image SL-Micro-Azure Image SL-Micro-BYOS-Azure Image SL-Micro-BYOS-EC2 Image SL-Micro-BYOS-GCE Image SL-Micro-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure Image SUSE-Multi-Linux-Manager-Proxy-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-Azure-llc Image SUSE-Multi-Linux-Manager-Server-Azure-ltd Image SUSE-Multi-Linux-Manager-Server-BYOS-Azure Image SUSE-Multi-Linux-Manager-Server-BYOS-EC2 Image SUSE-Multi-Linux-Manager-Server-BYOS-GCE Image SUSE-Multi-Linux-Manager-Server-EC2-llc Image SUSE-Multi-Linux-Manager-Server-EC2-ltd Affected

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CVE-2026-6276 vulnerability details – vuln.today

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