GHSA-hf82-6jff-f22v
Severity by source
Sources disagree (Medium–Critical)AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Network vector but AC:H because it needs an app that switches CA source on a reused handle plus a MITM attacker holding a natively-trusted cert; high C/I impact via TLS interception, no availability effect.
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
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 VectorVendor
Lifecycle Timeline
5Description PRE-NVD
Articles & Coverage 1
AnalysisAI
TLS certificate-trust confusion in libcurl (curl 8.17.0 through 8.20.0) lets a reused pooled connection retain trust in the native platform CA store even after the application reconfigures the same easy handle to use custom CA material for a later transfer. An attacker positioned to intercept traffic could present a certificate valid under the native store - which the application intended to no longer trust - to silently intercept or spoof the connection. Rated CVSS 9.1, but EPSS is only 0.20% (9th percentile) and there is no public exploit identified at time of analysis, reflecting the narrow application-usage prerequisite rather than a broadly weaponizable flaw.
Technical ContextAI
libcurl maintains a connection pool so subsequent transfers can reuse an already-established connection when its setup parameters match. The matching logic here fails to account for a change in CA trust source on the same easy handle: if the first transfer validated the peer against the OS/native platform trust store (native CA) and the application then switches that handle to explicit custom CA material (e.g. CURLOPT_CAINFO / CURLOPT_CAPATH or a custom CA blob) for a later transfer, libcurl may reuse the earlier connection and continue honoring the previously used native trust decision. The root-cause class is improper certificate/trust validation on connection reuse (conceptually CWE-295 Improper Certificate Validation, though the input lists CWE as N/A). The affected component is the TLS-agnostic connection-reuse layer, so the issue is not tied to a single TLS backend but to how curl caches and matches connections.
RemediationAI
Patch available per vendor advisory (https://curl.se/docs/CVE-2026-11564.html) - upgrade libcurl to the fixed release above 8.20.0 once it is deployed by your distribution or vendor; the provided data does not include an exact fixed version number, so confirm it against the curl advisory rather than assuming one. As a code-level workaround, applications should avoid changing CA trust source (native store versus custom CURLOPT_CAINFO/CAPATH/CA blob) on an already-used easy handle; instead create a fresh easy handle for the transfer that uses different CA material, or disable connection reuse for the affected transfer via CURLOPT_FRESH_CONNECT and CURLOPT_FORBID_REUSE (trade-off: loss of connection-pool performance and extra TLS handshakes). Operationally, MITM risk can be reduced by enforcing certificate pinning (CURLOPT_PINNEDPUBLICKEY) for sensitive endpoints, at the cost of pin-rotation maintenance. Rebuild static binaries that vendor libcurl against the fixed version.
Stack-based buffer overflow in the Curl_sasl_create_digest_md5_message function in lib/curl_sasl.c in curl and libcurl 7
The sanitize_cookie_path function in cURL and libcurl 7.31.0 through 7.41.0 does not properly calculate an index, which
When doing HTTP(S) transfers, libcurl might erroneously use the read callback (`CURLOPT_READFUNCTION`) to ask for data t
When curl < 7.84.0 saves cookies, alt-svc and hsts data to local files, it makes the operation atomic by finalizing the
Curl_smtp_escape_eob in lib/smtp.c in curl 7.54.1 to and including curl 7.60.0 has a heap-based buffer overflow that mig
1. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack co
A cleartext transmission of sensitive information vulnerability exists in curl <v7.88.0 that could cause HSTS functional
A path traversal vulnerability exists in curl <8.0.0 SFTP implementation causes the tilde (~) character to be wrongly re
A vulnerability in input validation exists in curl <8.0 during communication using the TELNET protocol may allow an atta
curl's HTTP proxy connection reuse mechanism fails to validate credential changes, allowing an attacker to intercept or
A double-close vulnerability exists in libcurl when tearing down connection channels after threaded name resolution, cau
An improper authentication vulnerability exists in curl 7.33.0 to and including 7.82.0 which might allow reuse OAUTH2-au
Same weakness CWE-295 – Improper Certificate Validation
View allSame technique Information Disclosure
View allVendor StatusVendor
SUSE
Severity: Important| Product | Status |
|---|---|
| SLES15-SP5-CHOST-BYOS-SAP-CCloud | Not-Affected |
| SLES15-SP6-CHOST-BYOS | Not-Affected |
| SLES15-SP6-CHOST-BYOS-Aliyun | Not-Affected |
| SLES15-SP6-CHOST-BYOS-Azure | Not-Affected |
| SLES15-SP6-CHOST-BYOS-EC2 | Not-Affected |
| SLES15-SP6-CHOST-BYOS-GCE | Not-Affected |
| SLES15-SP6-CHOST-BYOS-GDC | Not-Affected |
| SLES15-SP6-CHOST-BYOS-SAP-CCloud | Not-Affected |
| SLES15-SP7-CHOST-BYOS-Aliyun | Not-Affected |
| SLES15-SP7-CHOST-BYOS-Azure | Not-Affected |
| SLES15-SP7-CHOST-BYOS-EC2 | Not-Affected |
| SLES15-SP7-CHOST-BYOS-GCE | Not-Affected |
| SLES15-SP7-CHOST-BYOS-GDC | Not-Affected |
| SLES15-SP7-CHOST-BYOS-SAP-CCloud | Not-Affected |
| SUSE Linux Enterprise Desktop 15 SP7 | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | Not-Affected |
| SUSE Linux Enterprise Micro 5.3 | Not-Affected |
| SUSE Linux Enterprise Micro 5.4 | Not-Affected |
| SUSE Linux Enterprise Micro 5.5 | Not-Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | Not-Affected |
| SUSE Linux Enterprise Server 15 SP7 | Not-Affected |
| SUSE Linux Enterprise Server 16.0 | Not-Affected |
| SUSE Linux Enterprise Server 16.1 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | Not-Affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | Not-Affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | Affected |
| SUSE Linux Micro 6.0 | Not-Affected |
| SUSE Linux Micro 6.1 | Not-Affected |
| SUSE Linux Micro 6.2 | Not-Affected |
| openSUSE Leap 16.0 | Not-Affected |
| SLES15-SP3-CHOST-BYOS-Aliyun | Not-Affected |
| SLES15-SP3-CHOST-BYOS-Azure | Not-Affected |
| SLES15-SP3-CHOST-BYOS-EC2 | Not-Affected |
| SLES15-SP3-CHOST-BYOS-GCE | Not-Affected |
| SLES15-SP3-CHOST-BYOS-SAP-CCloud | Not-Affected |
| SLES15-SP4-CHOST-BYOS | Not-Affected |
| SLES15-SP4-CHOST-BYOS-Aliyun | Not-Affected |
| SLES15-SP4-CHOST-BYOS-Azure | Not-Affected |
| SLES15-SP4-CHOST-BYOS-EC2 | Not-Affected |
| SLES15-SP4-CHOST-BYOS-GCE | Not-Affected |
| SLES15-SP4-CHOST-BYOS-SAP-CCloud | Not-Affected |
| SLES15-SP5-CHOST-BYOS-Aliyun | Not-Affected |
| SLES15-SP5-CHOST-BYOS-Azure | Not-Affected |
| SLES15-SP5-CHOST-BYOS-EC2 | Not-Affected |
| SLES15-SP5-CHOST-BYOS-GCE | Not-Affected |
| SLES15-SP5-CHOST-BYOS-GDC | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | Not-Affected |
| SUSE Linux Enterprise Installer Updates 15 SP4 | Not-Affected |
| SUSE Linux Enterprise Installer Updates 15 SP5 | Not-Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP4 | Not-Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | Not-Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP6 | Not-Affected |
| SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE | Not-Affected |
| SUSE Linux Enterprise Server 12 SP5 | Not-Affected |
| SUSE Linux Enterprise Server 12 SP5-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 12 SP5-LTSS Extended Security | Not-Affected |
| SUSE Linux Enterprise Server 15 SP4 | Not-Affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 15 SP5 | Not-Affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 15 SP6 | Not-Affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | Not-Affected |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | Not-Affected |
| SUSE Manager Proxy 4.3 | Not-Affected |
| SUSE Manager Proxy LTS 4.3 | Not-Affected |
| SUSE Manager Retail Branch Server 4.3 | Not-Affected |
| SUSE Manager Retail Branch Server LTS 4.3 | Not-Affected |
| SUSE Manager Server 4.3 | Not-Affected |
| SUSE Manager Server LTS 4.3 | Not-Affected |
| SUSE CaaS Platform 3.0 | Not-Affected |
| SUSE CaaS Platform 4.0 | Not-Affected |
| SUSE Enterprise Storage 6 | Not-Affected |
| SUSE Enterprise Storage 7 | Not-Affected |
| SUSE Enterprise Storage 7.1 | Not-Affected |
| SUSE Linux Enterprise Desktop 11 SP3 | Not-Affected |
| SUSE Linux Enterprise Desktop 11 SP4 | Not-Affected |
| SUSE Linux Enterprise Desktop 12 | Not-Affected |
| SUSE Linux Enterprise Desktop 12 SP1 | Not-Affected |
| SUSE Linux Enterprise Desktop 12 SP2 | Not-Affected |
| SUSE Linux Enterprise Desktop 12 SP3 | Not-Affected |
| SUSE Linux Enterprise Desktop 12 SP4 | Not-Affected |
| SUSE Linux Enterprise Desktop 15 | Not-Affected |
| SUSE Linux Enterprise Desktop 15 SP1 | Not-Affected |
| SUSE Linux Enterprise Desktop 15 SP2 | Not-Affected |
| SUSE Linux Enterprise Desktop 15 SP3 | Not-Affected |
| SUSE Linux Enterprise Desktop 15 SP4 | Not-Affected |
| SUSE Linux Enterprise Desktop 15 SP5 | Not-Affected |
| SUSE Linux Enterprise Desktop 15 SP6 | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1 | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2 | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3 | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15-ESPOS | Not-Affected |
| SUSE Linux Enterprise High Performance Computing 15-LTSS | Not-Affected |
| SUSE Linux Enterprise Micro 5.0 | Not-Affected |
| SUSE Linux Enterprise Micro 5.1 | Not-Affected |
| SUSE Linux Enterprise Micro 5.2 | Not-Affected |
| SUSE Linux Enterprise Module for Basesystem 15 | Not-Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP1 | Not-Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP2 | Not-Affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP3 | Not-Affected |
| SUSE Linux Enterprise Point of Sale 11 SP3 | Not-Affected |
| SUSE Linux Enterprise Point of Sale 12 SP2-CLIENT | Not-Affected |
| SUSE Linux Enterprise Real Time 15 SP2 | Not-Affected |
| SUSE Linux Enterprise Real Time 15 SP3 | Not-Affected |
| SUSE Linux Enterprise Real Time 15 SP4 | Not-Affected |
| SUSE Linux Enterprise Server 11 SP3 | Not-Affected |
| SUSE Linux Enterprise Server 11 SP3-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 11 SP4 | Not-Affected |
| SUSE Linux Enterprise Server 11 SP4-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 12 | Not-Affected |
| SUSE Linux Enterprise Server 12 SP1 | Not-Affected |
| SUSE Linux Enterprise Server 12 SP1-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 12 SP2 | Not-Affected |
| SUSE Linux Enterprise Server 12 SP2-BCL | Not-Affected |
| SUSE Linux Enterprise Server 12 SP2-ESPOS | Not-Affected |
| SUSE Linux Enterprise Server 12 SP2-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 12 SP3 | Not-Affected |
| SUSE Linux Enterprise Server 12 SP3-BCL | Not-Affected |
| SUSE Linux Enterprise Server 12 SP3-ESPOS | Not-Affected |
| SUSE Linux Enterprise Server 12 SP3-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 12 SP4 | Not-Affected |
| SUSE Linux Enterprise Server 12 SP4-ESPOS | Not-Affected |
| SUSE Linux Enterprise Server 12 SP4-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 12-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 15 | Not-Affected |
| SUSE Linux Enterprise Server 15 SP1 | Not-Affected |
| SUSE Linux Enterprise Server 15 SP1-BCL | Not-Affected |
| SUSE Linux Enterprise Server 15 SP1-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 15 SP2 | Not-Affected |
| SUSE Linux Enterprise Server 15 SP2-BCL | Not-Affected |
| SUSE Linux Enterprise Server 15 SP2-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 15 SP3 | Not-Affected |
| SUSE Linux Enterprise Server 15 SP3-BCL | Not-Affected |
| SUSE Linux Enterprise Server 15 SP3-LTSS | Not-Affected |
| SUSE Linux Enterprise Server 15-LTSS | Not-Affected |
| SUSE Linux Enterprise Server for Raspberry Pi 12 SP2 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 11 SP3 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 11 SP4 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP1 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP2 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | Not-Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | Not-Affected |
| SUSE Linux Enterprise Software Development Kit 11 SP3 | Not-Affected |
| SUSE Linux Enterprise Software Development Kit 11 SP4 | Not-Affected |
| SUSE Linux Enterprise Software Development Kit 12 | Not-Affected |
| SUSE Linux Enterprise Software Development Kit 12 SP1 | Not-Affected |
| SUSE Linux Enterprise Software Development Kit 12 SP2 | Not-Affected |
| SUSE Linux Enterprise Software Development Kit 12 SP3 | Not-Affected |
| SUSE Linux Enterprise Software Development Kit 12 SP4 | Not-Affected |
| SUSE Linux Enterprise Software Development Kit 12 SP5 | Not-Affected |
| SUSE Manager Proxy 4.0 | Not-Affected |
| SUSE Manager Proxy 4.1 | Not-Affected |
| SUSE Manager Proxy 4.2 | Not-Affected |
| SUSE Manager Retail Branch Server 4.0 | Not-Affected |
| SUSE Manager Retail Branch Server 4.1 | Not-Affected |
| SUSE Manager Retail Branch Server 4.2 | Not-Affected |
| SUSE Manager Server 4.0 | Not-Affected |
| SUSE Manager Server 4.1 | Not-Affected |
| SUSE Manager Server 4.2 | Not-Affected |
| SUSE OpenStack Cloud 7 | Not-Affected |
| SUSE OpenStack Cloud 8 | Not-Affected |
| SUSE OpenStack Cloud 9 | Not-Affected |
| SUSE OpenStack Cloud Crowbar 8 | Not-Affected |
| SUSE OpenStack Cloud Crowbar 9 | Not-Affected |
| openSUSE Leap 15.3 | Not-Affected |
| openSUSE Leap 15.4 | Not-Affected |
| openSUSE Leap 15.5 | Not-Affected |
| openSUSE Leap 15.6 | Not-Affected |
| openSUSE Leap Micro 5.2 | Not-Affected |
| openSUSE Leap Micro 5.3 | Not-Affected |
| openSUSE Leap Micro 5.4 | Not-Affected |
| openSUSE Leap Micro 5.5 | Not-Affected |
| SLES-CHOST-BYOS-Aliyun | Not-Affected |
| SLES-CHOST-BYOS-Azure | Not-Affected |
| SLES-CHOST-BYOS-EC2 | Not-Affected |
| SLES-CHOST-BYOS-GCE | Not-Affected |
| SLES-CHOST-BYOS-GDC | Not-Affected |
| SLES-CHOST-BYOS-SAP-CCloud | Not-Affected |
| bci/gcc bci/golang bci/golang:1.23 bci/golang:1.23-openssl bci/kiwi bci/node:18 bci/node:22 bci/openjdk bci/openjdk:11 bci/openjdk:17 bci/python bci/python:3 bci/ruby bci/spack:0.23 containers/open-webui-mcpo:0 containers/open-webui-pipelines:0 containers/open-webui:0 containers/python:3.11 containers/python:3.9 kiwi-templates-Minimal kiwi-templates-Minimal-Cloud-sap kiwi-templates-Minimal-MS-HyperV-sap kiwi-templates-Minimal-VMware-sap kiwi-templates-Minimal-kvm-and-xen-sap rancher/seedimage-builder rancher/seedimage-builder/5.3 suse/hpc/warewulf4-x86_64/sle-hpc-node suse/manager/4.3/proxy-httpd suse/manager/4.3/proxy-salt-broker suse/manager/5.0/x86_64/proxy-httpd suse/manager/5.0/x86_64/proxy-salt-broker suse/manager/5.0/x86_64/server suse/multi-linux-manager/5.1/x86_64/proxy-httpd suse/multi-linux-manager/5.1/x86_64/proxy-salt-broker suse/multi-linux-manager/5.1/x86_64/server suse/multi-linux-manager/5.2/x86_64/monitoring-alertmanager suse/multi-linux-manager/5.2/x86_64/monitoring-blackbox_exporter suse/multi-linux-manager/5.2/x86_64/monitoring-prometheus suse/multi-linux-manager/5.2/x86_64/proxy-httpd suse/multi-linux-manager/5.2/x86_64/server suse/sle-micro-rancher/5.2 suse/sle-micro-rancher/5.3 suse/sle-micro-rancher/5.4 suse/sle-micro/5.1/toolbox suse/sle-micro/5.2/toolbox suse/sle-micro/5.3/toolbox suse/sle-micro/5.4/toolbox suse/sle-micro/5.5/toolbox suse/sle-micro/base-5.5 suse/sle15:15.3 suse/sle15:15.4 suse/sle15:15.5 suse/sles/15.3/libguestfs-tools:0.45.0 suse/sles/15.4/libguestfs-tools:0.49.0 suse/sles/15.4/virt-handler:0.49.0 suse/sles/15.5/cdi-cloner:1.55.0 suse/sles/15.5/cdi-importer:1.55.0 suse/sles/15.5/cdi-uploadserver:1.55.0 suse/sles/15.5/libguestfs-tools:0.58.0 suse/sles/15.5/virt-handler:0.58.0 suse/sles/15.5/virt-launcher:0.58.0 suse/sles/15.6/cdi-cloner:1.58.0 suse/sles/15.6/cdi-importer:1.58.0 suse/sles/15.6/cdi-uploadserver:1.58.0 suse/sles/15.6/libguestfs-tools:1.1.1 suse/sles/15.6/virt-handler:1.1.1 suse/sles/15.6/virt-launcher:1.1.1 suse/sles/15.7/cdi-cloner:1.58.0 suse/sles/15.7/cdi-importer:1.58.0 suse/sles/15.7/cdi-uploadserver:1.58.0 suse/sles/15.7/libguestfs-tools:1.5.0 suse/sles/15.7/virt-handler:1.5.0 suse/sles/15.7/virt-launcher:1.5.0 suse/sles/16.0/toolbox | Not-Affected |
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-41499