{"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":"2.2.1b","versionType":"custom"},{"status":"unaffected","version":"4.2.1-a.2","versionType":"custom"}]}],"cveId":"CVE-2026-124001","cwes":["CWE-190","CWE-787"],"description":"NASA JPL ION-DTN 2.2.1b through 4.2.0 contains an integer overflow vulnerability in the Datagram Retransmission (DGR) convergence layer that allows attackers to corrupt heap memory by sending a maliciously crafted 64-bit svcDataLength value that wraps a 32-bit allocation size calculation. Attackers can exploit the dgr_receive API's unchecked memcpy operation using synthetic datagrams or DGR traffic over internal IPC or custom transports to trigger an out-of-bounds write, leading to denial of service or potential remote code execution.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":9.2,"severity":"critical","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},{"score":8.1,"severity":"high","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"}],"modifiedAt":1794249925184,"publishedAt":1794249925184,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/nasa-jpl/ION-DTN/security/advisories/GHSA-rcqq-5qmv-7fxp"},{"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-1b-integer-overflow-heap-corruption-via-dgr"}],"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":"ff551e045bcd034504e7501362a72cff6edd29833094a798fef1c00bbc6e60cc","sources":[{"modifiedAt":1794249925184,"name":"CNA: VulnCheck","retrievedAt":1794251344912,"url":"https://www.cve.org/CVERecord?id=CVE-2026-124001"}],"ssvc":null,"status":"published","title":"ION-DTN 2.2.1b-4.2.0 Integer Overflow Heap Corruption via DGR","updatedAt":1794251344912}