CVE-2026-45103

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{"affected": [{"affectedData": [{"product": "opensips", "vendor": "OpenSIPS", "versions": [{"status": "affected", "version": ">= 3.4.0, < 3.6.6"}, {"status": "affected", "version": ">= 4.0.0-beta, < 4.0.0-rc1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "OpenSIPS is a Session Initiation Protocol (SIP) server implementation. In versions prior to 3.6.6 and 4.0.0-rc1, the TCP message framing layer parses the Content-Length header using unsigned int arithmetic with no overflow check. When an attacker sends a Content-Length value that overflows unsigned int (e.g., 4294967296), the framing layer computes a wrapped-around value (e.g., 0) and splits the TCP stream at the wrong boundary, causing the body of the first SIP message to be processed as a separate message and enabling SIP message smuggling. Because Content-Length is parsed in the transport layer before authentication, an unauthenticated, network-based attacker can smuggle arbitrary SIP messages over any TCP-based transport (proto_tcp, proto_tls, proto_ws, proto_wss) on any instance with TCP enabled, with no routing-script preconditions. This allows smuggled messages to bypass front-end SBC/proxy security policies, inherit the connection's authentication context, and evade rate limiting. This issue has been fixed in versions 3.6.6 and 4.0.0-rc1."}], "id": "CVE-2026-45103", "lastModified": "2026-09-08T20:41:31.497", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-45103", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-05T17:53:22.085357Z", "version": "2.0.3"}}]}, "published": "2026-08-04T22:17:14.847", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/OpenSIPS/opensips/commit/4d23613b"}, {"source": "security-advisories@github.com", "url": "https://github.com/OpenSIPS/opensips/commit/5f103eff"}, {"source": "security-advisories@github.com", "url": "https://github.com/OpenSIPS/opensips/security/advisories/GHSA-jv35-555v-54jh"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.4.0,3.6.6)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.0.0-beta,4.0.0-rc1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "opensips", "source": "cna", "vendor": "OpenSIPS"}, "product": "opensips", "vendor": "opensips"}], "created": "2026-08-04T23:30:15.763530+00:00", "updated": "2026-08-04T23:30:15.879780+00:00", "vendors": ["opensips", "opensips$PRODUCT$opensips"]}