{"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":"2.1.0","versionType":"semver"},{"status":"unaffected","version":"4.2.1-a.2","versionType":"custom"}]}],"cveId":"CVE-2026-124000","cwes":["CWE-122"],"description":"NASA JPL ION-DTN 2.1.0 through 4.2.0 contains a heap buffer under-allocation vulnerability in the Asynchronous Message Service daemon (amsd) that allows a rogue or misconfigured peer to trigger an out-of-bounds write by sending crafted Meta-AMS (MAMS) configuration management messages that are processed without cryptographic authentication. Attackers can exploit the insufficient buffer size calculation for the internal state-event object to crash the active Configuration Server thread, causing a denial of service and potentially destabilizing subsequent shared-memory allocations in amsd.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":6.9,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"},{"score":5.3,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","version":"3.1"}],"modifiedAt":1794249946277,"publishedAt":1794249772070,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/nasa-jpl/ION-DTN/security/advisories/GHSA-h28r-fr59-c79c"},{"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-under-allocation-dos-in-amsd"}],"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":"c140eabf564681a0e100128014874eb9b9fc74ce6393aa3b53f64ff42772b046","sources":[{"modifiedAt":1794249946277,"name":"CNA: VulnCheck","retrievedAt":1794251343699,"url":"https://www.cve.org/CVERecord?id=CVE-2026-124000"}],"ssvc":null,"status":"published","title":"ION-DTN 2.1.0-4.2.0 Heap Buffer Under-allocation DoS in amsd","updatedAt":1794251343699}