CVE-2026-49837

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{"affected": [{"affectedData": [{"product": "gobgp", "vendor": "osrg", "versions": [{"status": "affected", "version": "< 4.6.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "GoBGP is an open source Border Gateway Protocol (BGP) implementation in the Go Programming Language. Versions prior to 4.6.0 contain a BGP OPEN capability parsing issue where several concrete capability decoders may parse data from the full remaining capability buffer instead of the slice bounded by the declared capability length, `CapLen`. A malformed BGP OPEN message can cause bytes from a following capability to be interpreted as part of the current capability. The most security-relevant case is the 4-octet AS capability, where a capability with `CapLen == 0` may cause the parser to read bytes from the following capability as the 4-octet AS value. This parsed value may later affect peer AS validation during BGP session establishment. Version 4.6.0 patches the issue."}], "id": "CVE-2026-49837", "lastModified": "2026-09-16T13:42:46.953", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-49837", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-09-15T15:10:05.962553Z", "version": "2.0.3"}}]}, "published": "2026-09-10T22:16:57.507", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/osrg/gobgp/commit/f02ca397821f6ca182ef4eb492c3cbc459552d7c"}, {"source": "security-advisories@github.com", "url": "https://github.com/osrg/gobgp/security/advisories/GHSA-gjrg-jjr3-56cm"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-125"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "github.com/osrg/gobgp: GoBGP: Malformed BGP OPEN message can disrupt BGP sessions", "id": "2531682", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2531682"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["A flaw was found in GoBGP, an open-source Border Gateway Protocol (BGP) implementation. A remote attacker could send a specially crafted BGP OPEN message, causing the BGP OPEN capability parser to misinterpret data. This issue arises because the parser may read capability values beyond their declared length, leading to incorrect processing of subsequent capabilities. This could affect peer Autonomous System (AS) validation during BGP session establishment, potentially disrupting network connectivity."], "name": "CVE-2026-49837", "package_state": [{"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/metallb-rhel8", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-09-10T21:56:13Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-49837\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-49837\nhttps://github.com/osrg/gobgp/commit/f02ca397821f6ca182ef4eb492c3cbc459552d7c\nhttps://github.com/osrg/gobgp/security/advisories/GHSA-gjrg-jjr3-56cm"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,4.6.0)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "gobgp", "source": "cna", "vendor": "osrg"}, "product": "gobgp", "vendor": "osrg"}], "created": "2026-09-11T01:00:09.673173+00:00", "updated": "2026-09-11T07:30:09.843508+00:00", "vendors": ["osrg", "osrg$PRODUCT$gobgp"]}