CVE-2026-123999

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.

• https://github.com/nasa-jpl/ION-DTN/releases/tag/ion-open-source-4.2.1-a.2
• https://github.com/nasa-jpl/ION-DTN/security/advisories/GHSA-gmhw-vmwr-wrxh

• https://github.com/nasa-jpl/ION-DTN/releases/tag/ion-open-source-4.2.1-a.2
• https://github.com/nasa-jpl/ION-DTN/security/advisories/GHSA-gmhw-vmwr-wrxh
• https://www.vulncheck.com/advisories/ion-dtn-heap-buffer-overflow-via-nm-mgr-amp-rendering

• CRITICALCVE-2016-15059PoC
• CRITICALCVE-2017-20241
• LOWCVE-2025-1218PoC
• MEDIUMCVE-2025-60480PoC
• MEDIUMCVE-2025-60490PoC
• HIGHCVE-2025-71436PoC
• HIGHCVE-2026-100201
• HIGHCVE-2026-100203

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