CVE-2026-3632

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This vulnerability occurs because libsoup does not properly validate hostnames, allowing special characters to be injected into HTTP headers. A remote attacker could exploit this to perform HTTP smuggling, where they can send hidden, malicious requests alongside legitimate ones. In certain situations, this could lead to Server-Side Request Forgery (SSRF), enabling an attacker to force the server to make unauthorized requests to other internal or external systems. The impact is low, as SoupServer is not actually used in internet infrastructure."}, {"lang": "es", "value": "Se encontr\u00f3 un defecto en libsoup, una biblioteca utilizada por aplicaciones para enviar peticiones de red. Esta vulnerabilidad ocurre porque libsoup no valida correctamente los nombres de host, permitiendo que se inyecten caracteres especiales en las cabeceras HTTP. Un atacante remoto podr\u00eda explotar esto para realizar contrabando HTTP, donde pueden enviar peticiones ocultas y maliciosas junto con las leg\u00edtimas. En ciertas situaciones, esto podr\u00eda llevar a Falsificaci\u00f3n de Petici\u00f3n del Lado del Servidor (SSRF), permitiendo a un atacante forzar al servidor a realizar peticiones no autorizadas a otros sistemas internos o externos. El impacto es bajo, ya que SoupServer no se utiliza realmente en la infraestructura de internet."}], "id": "CVE-2026-3632", "lastModified": "2026-11-06T19:17:50.120", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 3.9, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "HIGH", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 0.5, "impactScore": 3.4, "source": "secalert@redhat.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 3.4, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-3632", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-17T13:01:56.752811Z", "version": "2.0.3"}}]}, "published": "2026-03-17T10:16:00.297", "references": [{"source": "secalert@redhat.com", "tags": ["Vendor Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-3632"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Vendor Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2445127"}, {"source": "secalert@redhat.com", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"], "url": "https://gitlab.gnome.org/GNOME/libsoup/-/issues/483"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-1286"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Codean Labs for reporting this issue.", "bugzilla": {"description": "libsoup: libsoup: HTTP Smuggling and Server-Side Request Forgery via Malformed Hostnames", "id": "2445127", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2445127"}, "csaw": false, "cvss3": {"cvss3_base_score": "3.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:L", "status": "draft"}, "cwe": "CWE-1286", "details": ["No description is available for this CVE."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-3632", "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": "Out of support scope", "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": "2026-03-06T05:05:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-3632\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-3632"], "statement": "This vulnerability has a LOW impact on Red Hat products. The `libsoup` library, when used as a client, does not adequately validate hostnames, allowing for HTTP header injection. This could lead to HTTP smuggling or Server-Side Request Forgery (SSRF) if an application processes attacker-controlled URLs.", "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": null}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "libsoup", "vendor": "libsoup"}], "analysis": {"en": {"generated_at": "2026-04-16T02:45:12.589391+00:00", "value": {"mitigation_remediation": ["Apply the latest Red\u202fHat Enterprise Linux update that includes the fixed libsoup package as soon as it becomes available.", "Upgrade the libsoup library to a version that incorporates the hostname validation fix, for example by installing the latest GNOME libSoup release from the distribution\u2019s package manager.", "Mitigate the SSRF risk by restricting the application\u2019s outbound HTTP traffic to only the domains it explicitly requires, using firewall rules or a reverse\u2011proxy that blocks unintended requests."], "summary": {"action": "Apply Patch", "impact": "Potential SSRF via malformed hostnames leading to HTTP smuggling"}, "threat_synthesis": {"affected_systems": "Red\u202fHat Enterprise Linux distributions 6, 7, 8, 9 and 10 are listed as affected. The vulnerability also applies to the GNOME libsoup library, which is part of the infrastructure of these operating systems. Specific vulnerable package versions are not enumerated in the advisory, so all current installations of libsoup on these RHEL releases should be considered at risk pending further detail.", "description_and_impact": "This flaw resides in the libsoup networking library used by applications to send HTTP requests. Because the library fails to validate hostnames, attackers can embed special characters in the Host header. The injected characters allow HTTP request smuggling, where one request is hidden within another. In some configurations, the injection can also trigger Server\u2011Side Request Forgery, forcing the server to issue requests to internal or external endpoints that the attacker controls. Although the root cause is low severity, the consequence is that a remote attacker could make the target server fetch or interact with unintended resources, potentially exposing sensitive data or triggering downstream vulnerabilities.", "risk_and_exploitability": "The CVSS score of 3.9 indicates low severity, and the EPSS score is under 1\u202fpercent, suggesting a small likelihood of exploitation as of the data snapshot. The vulnerability is not present in CISA\u2019s KEV catalog. The likely attack vector is remote network\u2011based, where an attacker sends a crafted HTTP request to an application using libsoup. If the application runs with elevated privileges or communicates with internal services, the attacker could use the SSRF capability to access those resources. While the vulnerability alone does not grant arbitrary code execution, its misuse could provide a foothold for further lateral movement or data exfiltration."}}}}, "created": "2026-03-09T10:08:43.524300+00:00", "updated": "2026-04-16T03:00:09.176553+00:00", "vendors": ["libsoup", "libsoup$PRODUCT$libsoup"]}