CVE-2026-1801

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This HTTP Request Smuggling vulnerability arises from non-RFC-compliant parsing in the soup_filter_input_stream_read_line() logic, where libsoup accepts malformed chunk headers, such as lone line feed (LF) characters instead of the required carriage return and line feed (CRLF). A remote attacker can exploit this without authentication or user interaction by sending specially crafted chunked requests. This allows libsoup to parse and process multiple HTTP requests from a single network message, potentially leading to information disclosure."}, {"lang": "es", "value": "Se encontr\u00f3 una falla en libsoup, una librer\u00eda cliente/servidor HTTP. Esta vulnerabilidad de contrabando de solicitudes HTTP surge de un an\u00e1lisis no conforme con RFC en la l\u00f3gica de soup_filter_input_stream_read_line(), donde libsoup acepta encabezados de fragmentos malformados, como caracteres de avance de l\u00ednea (LF) solitarios en lugar del retorno de carro y avance de l\u00ednea (CRLF) requeridos. Un atacante remoto puede explotar esto sin autenticaci\u00f3n ni interacci\u00f3n del usuario enviando solicitudes fragmentadas especialmente dise\u00f1adas. Esto permite a libsoup analizar y procesar m\u00faltiples solicitudes HTTP desde un \u00fanico mensaje de red, lo que podr\u00eda llevar a la revelaci\u00f3n de informaci\u00f3n."}], "id": "CVE-2026-1801", "lastModified": "2026-11-06T19:17:48.567", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.3, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 1.4, "source": "secalert@redhat.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 2.5, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-1801", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-02-03T20:40:42.165392Z", "version": "2.0.3"}}]}, "published": "2026-02-03T21:16:12.390", "references": [{"source": "secalert@redhat.com", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-1801"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Vendor Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436315"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking"], "url": "https://gitlab.gnome.org/GNOME/libsoup/-/issues/481"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-444"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Ahmed Lekssays for reporting this issue.", "bugzilla": {"description": "libsoup: libsoup: HTTP Request Smuggling via malformed chunk headers", "id": "2436315", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436315"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N", "status": "draft"}, "cwe": "CWE-444", "details": ["A flaw was found in libsoup, an HTTP client/server library. This HTTP Request Smuggling vulnerability arises from non-RFC-compliant parsing in the soup_filter_input_stream_read_line() logic, where libsoup accepts malformed chunk headers, such as lone line feed (LF) characters instead of the required carriage return and line feed (CRLF). A remote attacker can exploit this without authentication or user interaction by sending specially crafted chunked requests. This allows libsoup to parse and process multiple HTTP requests from a single network message, potentially leading to information disclosure."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-1801", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "libsoup3", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Fix deferred", "package_name": "libsoup", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Fix deferred", "package_name": "libsoup", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "libsoup", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "libsoup", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-02-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-1801\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-1801"], "statement": "This issue has a LOW impact. The libsoup library is vulnerable to HTTP Request Smuggling due to non-RFC-compliant parsing of chunk headers. While exploitation is possible remotely without authentication, the impact on Red Hat products is limited as the SoupServer component, which is affected by this flaw, is not commonly deployed in internet-facing infrastructure.", "threat_severity": "Low"}

{"analysis": {"en": {"generated_at": "2026-04-16T17:26:54.925800+00:00", "value": {"mitigation_remediation": ["Apply the latest security update for Red\u00a0Hat Enterprise Linux that includes the fixed libsoup package", "Upgrade or reinstall the GNOME libsoup library to the newest available version", "No official workaround has been provided by Red\u00a0Hat for this vulnerability"], "summary": {"action": "Patch", "impact": "Information Disclosure via HTTP request smuggling"}, "threat_synthesis": {"affected_systems": "Red\u00a0Hat Enterprise Linux versions\u202f6\u202fthrough\u202f10, and any installations that use the GNOME libsoup library. No specific subspecifications of libsoup versions are listed in the CNA data.", "description_and_impact": "A flaw in the GNOME libsoup HTTP client/server library permits remote attackers to send specially crafted chunked requests that contain malformed chunk headers, such as a lone line feed. Because libsoup\u2019s parsing logic accepts these headers, it can interpret a single network message as containing multiple HTTP requests. This behavior enables an attacker to smuggle requests through the server, potentially exposing sensitive data that would otherwise remain confined to the original request context.", "risk_and_exploitability": "The vulnerability has a CVSS score of 5.3, indicating moderate severity. EPSS scores below 1\u202f% suggest a low probability of exploitation at this time, and it is not currently listed in the CISA KEV catalog. Attackers can exploit the flaw without authentication or any user interaction by transmitting crafted HTTP requests directly to a target that uses libsoup as the server component. If successful, request smuggling may lead to unintended processing of multiple HTTP requests and information disclosure."}}}}, "created": "2026-04-16T17:30:26.013530+00:00", "updated": "2026-04-16T17:30:26.013542+00:00", "vendors": []}