CVE-2026-3099

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The server-side digest authentication implementation in the SoupAuthDomainDigest class does not properly track issued nonces or enforce the required incrementing nonce-count (nc) attribute. This vulnerability allows a remote attacker to capture a single valid authentication header and replay it repeatedly. Consequently, the attacker can bypass authentication and gain unauthorized access to protected resources, impersonating the legitimate user."}, {"lang": "es", "value": "Se encontr\u00f3 una falla en Libsoup. La implementaci\u00f3n de autenticaci\u00f3n digest del lado del servidor en la clase SoupAuthDomainDigest no rastrea adecuadamente los nonces emitidos ni aplica el atributo nonce-count (nc) incremental requerido. Esta vulnerabilidad permite a un atacante remoto capturar un \u00fanico encabezado de autenticaci\u00f3n v\u00e1lido y reproducirlo repetidamente. En consecuencia, el atacante puede eludir la autenticaci\u00f3n y obtener acceso no autorizado a recursos protegidos, suplantando al usuario leg\u00edtimo."}], "id": "CVE-2026-3099", "lastModified": "2026-11-05T20:17:58.270", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 5.8, "baseSeverity": "MEDIUM", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 3.7, "source": "secalert@redhat.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "LOW", "baseScore": 7.3, "baseSeverity": "HIGH", "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:L", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.4, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-3099", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-12T17:44:33.434069Z", "version": "2.0.3"}}]}, "published": "2026-03-12T14:16:18.760", "references": [{"source": "secalert@redhat.com", "tags": ["Third Party Advisory"], "url": "https://access.redhat.com/security/cve/CVE-2026-3099"}, {"source": "secalert@redhat.com", "tags": ["Issue Tracking", "Third Party Advisory"], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442232"}, {"source": "secalert@redhat.com", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "url": "https://gitlab.gnome.org/GNOME/libsoup/-/issues/495"}], "sourceIdentifier": "secalert@redhat.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-323"}], "source": "secalert@redhat.com", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Cavid for reporting this issue.", "bugzilla": {"description": "libsoup: Libsoup: Authentication bypass via digest authentication replay attack", "id": "2442232", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442232"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L", "status": "draft"}, "cwe": "CWE-323", "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-2026-3099", "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": "2026-02-24T01:01:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-3099\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-3099"], "threat_severity": "Moderate"}

{"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": "2026-04-17T09:57:22.268981+00:00", "value": {"mitigation_remediation": ["Disable HTTP Digest authentication for all services or migrate to a stronger authentication method such as token\u2011based authentication or mutual TLS.", "Restrict the network exposure of services that rely on Digest authentication by applying firewall rules or segmenting the network so that only trusted hosts can reach those services.", "Continuously monitor authentication logs and network traffic for repeated use of the same Authorization header, and deploy intrusion detection tools to alert on potential replay attacks.", "Refer to the Red\u00a0Hat Product Security CNA workaround status: currently no workaround meets the criteria, so rely on the above measures."], "summary": {"action": "Assess Impact", "impact": "Authentication Bypass"}, "threat_synthesis": {"affected_systems": "Red\u00a0Hat\u00a0Enterprise\u00a0Linux releases\u00a06,\u00a07,\u00a08,\u00a09, and\u00a010 are affected, as are systems that ship the GNOME Libsoup library. No specific version numbers are listed; the flaw applies to the Libsoup packages bundled with these operating systems and the referenced component.", "description_and_impact": "A flaw in Libsoup\u2019s server\u2011side digest authentication implementation fails to enforce nonce\u2011count progression and to track issued nonces, allowing a remote attacker to capture a single valid authentication header and replay it indefinitely. The attacker can thereby bypass authentication and impersonate a legitimate user, leading to unauthorized access, potential data tampering, and loss of confidentiality or integrity for resources protected by this mechanism.", "risk_and_exploitability": "The CVSS score of 5.8 signals moderate severity, while an EPSS value below 1% indicates a low current probability of exploitation. The vulnerability is not listed in the CISA KEV catalog. Exploitation requires only the ability to capture a valid HTTP Digest Authorization header over the network; the attacker can then replay that header with no additional privileges or access rights. Because no patch or widely applicable workaround is presently available, the risk persists as long as Digest authentication remains in use. The likely attack vector is a remote attacker observing traffic to a service that enables Digest authentication, capturing a single valid Authorization header, and replaying it repeatedly to gain access."}}}}, "created": "2026-02-25T11:45:25.727986+00:00", "updated": "2026-04-17T10:00:03.573523+00:00", "vendors": ["libsoup", "libsoup$PRODUCT$libsoup"]}