RHSA-2026:69125
Vulnerability from csaf_opensuse - Published: 2026-09-21 07:37 - Updated: 2026-09-23 12:37A flaw was found in libcurl. A logical error in the connection pooling mechanism may cause libcurl to reuse an authenticated connection for an unintended service. This could allow an application to wrongfully reuse an existing connection to the same server that was authenticated for a different service, potentially leading to unauthorized access or information disclosure.
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| Unresolved product id: AppStream-10.2.Z:curl-debuginfo-0:8.12.1-4.el10_2.6.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:curl-debuginfo-0:8.12.1-4.el10_2.6.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:curl-debuginfo-0:8.12.1-4.el10_2.6.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:curl-debuginfo-0:8.12.1-4.el10_2.6.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:curl-debugsource-0:8.12.1-4.el10_2.6.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:curl-debugsource-0:8.12.1-4.el10_2.6.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:curl-debugsource-0:8.12.1-4.el10_2.6.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:curl-debugsource-0:8.12.1-4.el10_2.6.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:libcurl-debuginfo-0:8.12.1-4.el10_2.6.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:libcurl-debuginfo-0:8.12.1-4.el10_2.6.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:libcurl-debuginfo-0:8.12.1-4.el10_2.6.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:libcurl-debuginfo-0:8.12.1-4.el10_2.6.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:libcurl-devel-0:8.12.1-4.el10_2.6.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:libcurl-devel-0:8.12.1-4.el10_2.6.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:libcurl-devel-0:8.12.1-4.el10_2.6.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:libcurl-devel-0:8.12.1-4.el10_2.6.x86_64 | — |
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| Unresolved product id: AppStream-10.2.Z:libcurl-minimal-debuginfo-0:8.12.1-4.el10_2.6.aarch64 | — |
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| Unresolved product id: AppStream-10.2.Z:libcurl-minimal-debuginfo-0:8.12.1-4.el10_2.6.ppc64le | — |
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| Unresolved product id: AppStream-10.2.Z:libcurl-minimal-debuginfo-0:8.12.1-4.el10_2.6.s390x | — |
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| Unresolved product id: AppStream-10.2.Z:libcurl-minimal-debuginfo-0:8.12.1-4.el10_2.6.x86_64 | — |
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| Unresolved product id: BaseOS-10.2.Z:curl-0:8.12.1-4.el10_2.6.aarch64 | — |
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| Unresolved product id: BaseOS-10.2.Z:curl-0:8.12.1-4.el10_2.6.ppc64le | — |
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| Unresolved product id: BaseOS-10.2.Z:curl-0:8.12.1-4.el10_2.6.s390x | — |
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| Unresolved product id: BaseOS-10.2.Z:curl-0:8.12.1-4.el10_2.6.src | — |
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| Unresolved product id: BaseOS-10.2.Z:curl-0:8.12.1-4.el10_2.6.x86_64 | — |
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| Unresolved product id: BaseOS-10.2.Z:curl-debuginfo-0:8.12.1-4.el10_2.6.aarch64 | — |
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| Unresolved product id: BaseOS-10.2.Z:curl-debuginfo-0:8.12.1-4.el10_2.6.ppc64le | — |
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| Unresolved product id: BaseOS-10.2.Z:curl-debuginfo-0:8.12.1-4.el10_2.6.s390x | — |
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| Unresolved product id: BaseOS-10.2.Z:curl-debuginfo-0:8.12.1-4.el10_2.6.x86_64 | — |
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| Unresolved product id: BaseOS-10.2.Z:curl-debugsource-0:8.12.1-4.el10_2.6.aarch64 | — |
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| Unresolved product id: BaseOS-10.2.Z:curl-debugsource-0:8.12.1-4.el10_2.6.ppc64le | — |
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| Unresolved product id: BaseOS-10.2.Z:curl-debugsource-0:8.12.1-4.el10_2.6.s390x | — |
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| Unresolved product id: BaseOS-10.2.Z:curl-debugsource-0:8.12.1-4.el10_2.6.x86_64 | — |
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| Unresolved product id: BaseOS-10.2.Z:libcurl-0:8.12.1-4.el10_2.6.aarch64 | — |
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| Unresolved product id: BaseOS-10.2.Z:libcurl-0:8.12.1-4.el10_2.6.ppc64le | — |
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| Unresolved product id: BaseOS-10.2.Z:libcurl-0:8.12.1-4.el10_2.6.s390x | — |
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| Unresolved product id: BaseOS-10.2.Z:libcurl-0:8.12.1-4.el10_2.6.x86_64 | — |
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| Unresolved product id: BaseOS-10.2.Z:libcurl-debuginfo-0:8.12.1-4.el10_2.6.aarch64 | — |
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| Unresolved product id: BaseOS-10.2.Z:libcurl-debuginfo-0:8.12.1-4.el10_2.6.ppc64le | — |
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| Unresolved product id: BaseOS-10.2.Z:libcurl-debuginfo-0:8.12.1-4.el10_2.6.s390x | — |
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| Unresolved product id: BaseOS-10.2.Z:libcurl-debuginfo-0:8.12.1-4.el10_2.6.x86_64 | — |
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| Unresolved product id: BaseOS-10.2.Z:libcurl-minimal-0:8.12.1-4.el10_2.6.aarch64 | — |
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| Unresolved product id: BaseOS-10.2.Z:libcurl-minimal-0:8.12.1-4.el10_2.6.ppc64le | — |
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| Unresolved product id: BaseOS-10.2.Z:libcurl-minimal-0:8.12.1-4.el10_2.6.s390x | — |
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| Unresolved product id: BaseOS-10.2.Z:libcurl-minimal-0:8.12.1-4.el10_2.6.x86_64 | — |
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| Unresolved product id: BaseOS-10.2.Z:libcurl-minimal-debuginfo-0:8.12.1-4.el10_2.6.aarch64 | — |
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| Unresolved product id: BaseOS-10.2.Z:libcurl-minimal-debuginfo-0:8.12.1-4.el10_2.6.ppc64le | — |
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| Unresolved product id: BaseOS-10.2.Z:libcurl-minimal-debuginfo-0:8.12.1-4.el10_2.6.s390x | — |
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| Unresolved product id: BaseOS-10.2.Z:libcurl-minimal-debuginfo-0:8.12.1-4.el10_2.6.x86_64 | — |
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A flaw was found in curl's cookie parsing logic. A malicious HTTP server can exploit this by setting 'super cookies' that bypass the Public Suffix List check. This allows an attacker-controlled origin to inject cookies that curl then transmits to unrelated third-party domains, leading to compromising request integrity.
A flaw was found in curl. When curl is configured to use a .netrc file for credentials and a URL is provided with a username but no password, curl may incorrectly retrieve and use the password for a different user from the .netrc file for the same host. This could lead to unauthorized information disclosure, as curl might connect using unintended credentials.
A flaw was found in curl. The libcurl library, used for transferring data with URLs, could improperly reuse existing network connections. This occurred even when changes to mutual Transport Layer Security (mTLS) settings, particularly those for client certificates, should have prevented such reuse. This issue could lead to a security feature bypass, where a client might use a connection with an unintended or weaker security configuration, potentially compromising the integrity or confidentiality of data.
A flaw was found in curl. When libcurl is instructed to clear proxy authentication credentials, it fails to do so, leaving the old credentials available. This could lead to the unintended reuse of sensitive proxy authentication credentials for subsequent network transfers, potentially resulting in unauthorized access or information disclosure.
A flaw was found in curl. When `libcurl` performs a transfer to an HTTP origin using Digest authentication and then reuses the same connection handle for a subsequent transfer to a different origin, it may incorrectly send the authentication header intended for the first origin to the second. This could lead to unintended information disclosure, potentially allowing an attacker to gain unauthorized access to sensitive data.
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"name": "Reliance on Cookies without Validation and Integrity Checking"
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{
"category": "description",
"text": "A flaw was found in curl\u0027s cookie parsing logic. A malicious HTTP server can exploit this by setting \u0027super cookies\u0027 that bypass the Public Suffix List check. This allows an attacker-controlled origin to inject cookies that curl then transmits to unrelated third-party domains, leading to compromising request integrity.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "curl: curl: Cookie injection via malicious HTTP server using super cookies",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Moderate: Red Hat rates this flaw Moderate (CVSS 6.5) compared to CISA\u0027s Critical (9.1). The scoring difference is due to two factors: first, exploitation requires the victim\u0027s curl to connect using a trailing-dot hostname (e.g., https://example.co.uk.), a format that is uncommon in practice and incompatible with TLS SNI; second, the direct impact is cookie injection into outbound requests \u2014 not exfiltration of victim data to the attacker. The curl project itself rates this flaw Low severity. Red Hat products that use curl for HTTP communication are affected, but the trailing-dot precondition significantly limits real-world exploitability. This flaw has not been shown to enable impacts beyond session integrity modification.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-8924"
},
{
"category": "external",
"summary": "RHBZ#2496765",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496765"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-8924",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-8924"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-8924",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8924"
},
{
"category": "external",
"summary": "https://curl.se/docs/CVE-2026-8924.html",
"url": "https://curl.se/docs/CVE-2026-8924.html"
},
{
"category": "external",
"summary": "https://curl.se/docs/CVE-2026-8924.json",
"url": "https://curl.se/docs/CVE-2026-8924.json"
},
{
"category": "external",
"summary": "https://hackerone.com/reports/3733905",
"url": "https://hackerone.com/reports/3733905"
}
],
"release_date": "2026-07-03T06:15:04.646000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-21T07:37:57+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"baseScore": 6.5,
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"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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{
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"cwe": {
"id": "CWE-289",
"name": "Authentication Bypass by Alternate Name"
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"discovery_date": "2026-07-03T07:01:18.157468+00:00",
"ids": [
{
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{
"category": "description",
"text": "A flaw was found in curl. When curl is configured to use a .netrc file for credentials and a URL is provided with a username but no password, curl may incorrectly retrieve and use the password for a different user from the .netrc file for the same host. This could lead to unauthorized information disclosure, as curl might connect using unintended credentials.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "curl: curl: Information disclosure via incorrect .netrc password lookup",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-8926"
},
{
"category": "external",
"summary": "RHBZ#2496760",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496760"
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{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-8926",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-8926"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-8926",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8926"
},
{
"category": "external",
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"category": "external",
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{
"category": "external",
"summary": "https://hackerone.com/reports/3735184",
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"release_date": "2026-07-03T06:15:45.735000+00:00",
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"category": "vendor_fix",
"date": "2026-09-21T07:37:57+00:00",
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"name": "Comparison Using Wrong Factors"
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"ids": [
{
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"text": "2496759"
}
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"notes": [
{
"category": "description",
"text": "A flaw was found in curl. The libcurl library, used for transferring data with URLs, could improperly reuse existing network connections. This occurred even when changes to mutual Transport Layer Security (mTLS) settings, particularly those for client certificates, should have prevented such reuse. This issue could lead to a security feature bypass, where a client might use a connection with an unintended or weaker security configuration, potentially compromising the integrity or confidentiality of data.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libcurl: libcurl: Security feature bypass due to improper mTLS connection reuse",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is an Important security feature bypass in libcurl where mTLS connection reuse may occur despite changes to client certificate settings. This could lead to applications using libcurl with mTLS to inadvertently use a less secure connection than intended, potentially compromising data confidentiality or integrity. This issue primarily affects applications that dynamically alter mTLS client certificate configurations and reuse connections.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-8932"
},
{
"category": "external",
"summary": "RHBZ#2496759",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496759"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-8932",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-8932"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-8932",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-8932"
},
{
"category": "external",
"summary": "https://curl.se/docs/CVE-2026-8932.html",
"url": "https://curl.se/docs/CVE-2026-8932.html"
},
{
"category": "external",
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},
{
"category": "external",
"summary": "https://hackerone.com/reports/3733910",
"url": "https://hackerone.com/reports/3733910"
}
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"release_date": "2026-07-03T06:16:30.485000+00:00",
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{
"category": "vendor_fix",
"date": "2026-09-21T07:37:57+00:00",
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"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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"title": "libcurl: libcurl: Security feature bypass due to improper mTLS connection reuse"
},
{
"cve": "CVE-2026-9079",
"cwe": {
"id": "CWE-212",
"name": "Improper Removal of Sensitive Information Before Storage or Transfer"
},
"discovery_date": "2026-07-03T07:01:50.605956+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2496771"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in curl. When libcurl is instructed to clear proxy authentication credentials, it fails to do so, leaving the old credentials available. This could lead to the unintended reuse of sensitive proxy authentication credentials for subsequent network transfers, potentially resulting in unauthorized access or information disclosure.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "libcurl: libcurl: Information disclosure due to failure to clear proxy authentication credentials",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "Important: A flaw in libcurl\u0027s proxy authentication credential management can lead to information disclosure. There are no integrity or availability risks posed by this flaw.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-9079"
},
{
"category": "external",
"summary": "RHBZ#2496771",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496771"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-9079",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-9079"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-9079",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9079"
},
{
"category": "external",
"summary": "https://curl.se/docs/CVE-2026-9079.html",
"url": "https://curl.se/docs/CVE-2026-9079.html"
},
{
"category": "external",
"summary": "https://curl.se/docs/CVE-2026-9079.json",
"url": "https://curl.se/docs/CVE-2026-9079.json"
},
{
"category": "external",
"summary": "https://hackerone.com/reports/3750295",
"url": "https://hackerone.com/reports/3750295"
}
],
"release_date": "2026-07-03T06:16:51.127000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-21T07:37:57+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "libcurl: libcurl: Information disclosure due to failure to clear proxy authentication credentials"
},
{
"cve": "CVE-2026-11856",
"cwe": {
"id": "CWE-201",
"name": "Insertion of Sensitive Information Into Sent Data"
},
"discovery_date": "2026-07-03T07:01:38.848109+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2496767"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in curl. When `libcurl` performs a transfer to an HTTP origin using Digest authentication and then reuses the same connection handle for a subsequent transfer to a different origin, it may incorrectly send the authentication header intended for the first origin to the second. This could lead to unintended information disclosure, potentially allowing an attacker to gain unauthorized access to sensitive data.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "curl: curl: Information disclosure via incorrect Digest authentication header reuse",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Moderate-severity flaw in `libcurl` can lead to information disclosure when an application reuses a `libcurl` handle for transfers to different HTTP origins while using Digest authentication. The vulnerability arises from `libcurl` incorrectly sending the authentication header intended for the initial origin to a subsequent, different origin. This could expose sensitive authentication data to an unintended recipient, potentially compromising user credentials or session information. The only observed impact from this flaw is an integrity impact.\n\n- libcurl only \u2014 the curl CLI is not affected\n- Requires an application to reuse an easy handle across different HTTP origins while Digest auth state is attached \u2014 a specific programming pattern\n- Credentials themselves are not leaked; only the authenticated state (\"Authorization: ...\" HTTP header)\n- Fixed in curl 8.21.0; affected range: 7.10.6 \u2013 8.20.0",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-11856"
},
{
"category": "external",
"summary": "RHBZ#2496767",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2496767"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-11856",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-11856"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-11856",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-11856"
},
{
"category": "external",
"summary": "https://curl.se/docs/CVE-2026-11856.html",
"url": "https://curl.se/docs/CVE-2026-11856.html"
},
{
"category": "external",
"summary": "https://curl.se/docs/CVE-2026-11856.json",
"url": "https://curl.se/docs/CVE-2026-11856.json"
},
{
"category": "external",
"summary": "https://hackerone.com/reports/3793260",
"url": "https://hackerone.com/reports/3793260"
}
],
"release_date": "2026-07-03T06:13:31.661000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-21T07:37:57+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "REQUIRED",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "curl: curl: Information disclosure via incorrect Digest authentication header reuse"
}
]
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.