CVE-2026-29785

{"id": "CVE-2026-29785", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "published": "2026-03-25T20:16:30.373", "references": [{"url": "https://advisories.nats.io/CVE/secnote-2026-04.txt", "tags": ["Mitigation", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/nats-io/nats-server/commit/a1488de6f2ba6e666aef0f9cce0016f7f167d6a8", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-52jh-2xxh-pwh6", "tags": ["Mitigation", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-476"}]}], "descriptions": [{"lang": "en", "value": "NATS-Server is a High-Performance server for NATS.io, a cloud and edge native messaging system. Prior to versions 2.11.14 and 2.12.5, if the nats-server has the \"leafnode\" configuration enabled (not default), then anyone who can connect can crash the nats-server by triggering a panic. This happens pre-authentication and requires that compression be enabled (which it is, by default, when leafnodes are used). Versions 2.11.14 and 2.12.5 contain a fix. As a workaround, disable compression on the leafnode port."}, {"lang": "es", "value": "NATS-Server es un servidor de alto rendimiento para NATS.io, un sistema de mensajer\u00eda nativo de la nube y del borde. Antes de las versiones 2.11.14 y 2.12.5, si el nats-server tiene la configuraci\u00f3n 'leafnode' habilitada (no predeterminada), entonces cualquiera que pueda conectarse puede bloquear el nats-server al desencadenar un p\u00e1nico. Esto ocurre antes de la autenticaci\u00f3n y requiere que la compresi\u00f3n est\u00e9 habilitada (lo cual est\u00e1 habilitado, por defecto, cuando se usan leafnodes). Las versiones 2.11.14 y 2.12.5 contienen una correcci\u00f3n. Como soluci\u00f3n alternativa, deshabilite la compresi\u00f3n en el puerto leafnode."}], "lastModified": "2026-03-26T17:13:31.983", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4AC9CDDF-79F4-406A-8BD9-B19953A76A4F", "versionEndExcluding": "2.11.14"}, {"criteria": "cpe:2.3:a:linuxfoundation:nats-server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "B141DA72-3502-4746-A246-EE1087C993F4", "versionEndExcluding": "2.12.5", "versionStartIncluding": "2.12.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}