{"affected":[{"defaultStatus":"unaffected","ecosystem":"github","packageName":"nasa-jpl/ION-DTN","product":"ION-DTN","source":"CNA: VulnCheck","vendor":"nasa-jpl","versions":[{"lessThanOrEqual":"4.2.0","status":"affected","version":"3.6.2","versionType":"semver"},{"status":"unaffected","version":"4.2.1-a.2","versionType":"custom"}]}],"cveId":"CVE-2026-123999","cwes":["CWE-122"],"description":"NASA JPL ION-DTN 3.6.2 through 4.2.0 contains a heap-based buffer overflow in the Network Management daemon (nm_mgr) string-formatting logic that allows a malicious or misconfigured agent to trigger an out-of-bounds write by sending deeply nested AMP payloads that exceed fixed-size buffer allocations through unbounded strcat operations. Attackers can transmit oversized AMP reports, tables, or macros over the UDP CLA/AMP path or trigger the flaw locally via interactive UI rendering to crash nm_mgr and cause a denial of service halting telemetry collection and operator visibility.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":8.7,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},{"score":7.5,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}],"modifiedAt":1794250016529,"publishedAt":1794249693110,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/nasa-jpl/ION-DTN/security/advisories/GHSA-gmhw-vmwr-wrxh"},{"source":"CNA: VulnCheck","tags":["release-notes","patch"],"url":"https://github.com/nasa-jpl/ION-DTN/releases/tag/ion-open-source-4.2.1-a.2"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/ion-dtn-heap-buffer-overflow-via-nm-mgr-amp-rendering"}],"remediation":[{"kind":"fix","source":"CNA: VulnCheck","text":"The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.","url":"https://github.com/nasa-jpl/ION-DTN/releases/tag/ion-open-source-4.2.1-a.2"}],"revision":"22e0e7d3fd1fd3303c6f6c34cd362e39f0d11fd75c119d2fd72b00b1c04a87ff","sources":[{"modifiedAt":1794250016529,"name":"CNA: VulnCheck","retrievedAt":1794251342600,"url":"https://www.cve.org/CVERecord?id=CVE-2026-123999"}],"ssvc":null,"status":"published","title":"ION-DTN 3.6.2-4.2.0 Heap Buffer Overflow via nm_mgr AMP Rendering","updatedAt":1794251342600}