{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-29785", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-03-04T16:26:02.899Z", "datePublished": "2026-03-25T19:38:44.587Z", "dateUpdated": "2026-08-24T12:07:07.380Z" }, "containers": { "cna": { "title": "NATS Server panic via malicious compression on leafnode port", "problemTypes": [ { "descriptions": [ { "cweId": "CWE-476", "lang": "en", "description": "CWE-476: NULL Pointer Dereference", "type": "CWE" } ] } ], "metrics": [ { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" } } ], "references": [ { "name": "https://github.com/nats-io/nats-server/security/advisories/GHSA-52jh-2xxh-pwh6", "tags": [ "x_refsource_CONFIRM" ], "url": "https://github.com/nats-io/nats-server/security/advisories/GHSA-52jh-2xxh-pwh6" }, { "name": "https://github.com/nats-io/nats-server/commit/a1488de6f2ba6e666aef0f9cce0016f7f167d6a8", "tags": [ "x_refsource_MISC" ], "url": "https://github.com/nats-io/nats-server/commit/a1488de6f2ba6e666aef0f9cce0016f7f167d6a8" }, { "name": "https://advisories.nats.io/CVE/secnote-2026-04.txt", "tags": [ "x_refsource_MISC" ], "url": "https://advisories.nats.io/CVE/secnote-2026-04.txt" } ], "affected": [ { "vendor": "nats-io", "product": "nats-server", "versions": [ { "version": "< 2.11.14", "status": "affected" }, { "version": ">= 2.12.0-RC.1, < 2.12.5", "status": "affected" } ] } ], "providerMetadata": { "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-25T19:40:51.282Z" }, "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." } ], "source": { "advisory": "GHSA-52jh-2xxh-pwh6", "discovery": "UNKNOWN" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-03-28T01:33:48.548539Z", "id": "CVE-2026-29785", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-28T01:34:06.528Z" } }, { "affected": [ { "collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": [ "cpe:/a:redhat:multicluster_globalhub:1.5::el9" ], "defaultStatus": "affected", "packageName": "multicluster-globalhub/multicluster-globalhub-grafana-rhel9", "product": "Multicluster Global Hub 1.5.6", "vendor": "Red Hat", "versions": [ { "lessThan": "*", "status": "unaffected", "version": "1778867753", "versionType": "rpm" } ] }, { "collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": [ "cpe:/a:redhat:multicluster_globalhub:1.4::el9" ], "defaultStatus": "affected", "packageName": "multicluster-globalhub/multicluster-globalhub-grafana-rhel9", "product": "Red Hat multicluster global hub 1.4.2", "vendor": "Red Hat", "versions": [ { "lessThan": "*", "status": "unaffected", "version": "1779579439", "versionType": "rpm" } ] }, { "collectionURL": "https://catalog.redhat.com/software/containers/", "cpes": [ "cpe:/a:redhat:multicluster_globalhub:1.6::el9" ], "defaultStatus": "affected", "packageName": "multicluster-globalhub/multicluster-globalhub-grafana-rhel9", "product": "Red Hat multicluster global hub 1.6.0", "vendor": "Red Hat", "versions": [ { "lessThan": "*", "status": "unaffected", "version": "1780167118", "versionType": "rpm" } ] }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:openshift:4" ], "defaultStatus": "unaffected", "packageName": "openshift4/oc-mirror-plugin-rhel9", "product": "Red Hat OpenShift Container Platform 4", "vendor": "Red Hat" } ], "datePublic": "2026-03-25T19:38:44.587Z", "descriptions": [ { "lang": "en", "value": "A flaw was found in NATS-Server. A remote attacker can exploit this vulnerability by connecting to a NATS-Server instance where the 'leafnode' configuration is enabled and compression is active. This pre-authentication flaw allows the attacker to trigger a server crash, resulting in a Denial of Service (DoS) for the affected system." } ], "metrics": [ { "other": { "content": { "namespace": "https://access.redhat.com/security/updates/classification/", "value": "Important" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" }, "format": "CVSS" } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-409", "description": "Improper Handling of Highly Compressed Data (Data Amplification)", "lang": "en", "type": "CWE" } ] } ], "references": [ { "tags": [ "vdb-entry", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/security/cve/CVE-2026-29785" }, { "name": "RHBZ#2451444", "tags": [ "issue-tracking", "x_refsource_REDHAT" ], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451444" }, { "tags": [ "x_sadp-csaf-vex" ], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29785.json" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:21769" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:22347" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/errata/RHSA-2026:23345" } ], "solutions": [ { "lang": "en", "value": "RHSA-2026:21769: Multicluster Global Hub 1.5.6" }, { "lang": "en", "value": "RHSA-2026:22347: Red Hat multicluster global hub 1.4.2" }, { "lang": "en", "value": "RHSA-2026:23345: Red Hat multicluster global hub 1.6.0" } ], "timeline": [ { "lang": "en", "time": "2026-03-25T20:01:35.121Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-03-25T19:38:44.587Z", "value": "Made public." } ], "title": "github.com/nats-io/nats-server: NATS-Server: Denial of Service via leafnode compression", "workarounds": [ { "lang": "en", "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." } ], "x_adpType": "supplier", "x_generator": { "engine": "sadp-cli 1.0.0" }, "providerMetadata": { "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-08-24T12:07:07.380Z" } } ] } }