Buffer overflow in Nasa-Jpl Ion-Dtn
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/nasa-jpl/ION-DTN/security/advisories/GHSA-gmhw-vmwr-wrxh (vendor-advisory)
- github.com/nasa-jpl/ION-DTN/releases/tag/ion-open-source-4.2.1-a.2 (release-notes, patch)
- www.vulncheck.com/advisories/ion-dtn-heap-buffer-overflow-via-nm-mgr-amp-render… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-123999?
- CVE-2026-123999 is a high-severity vulnerability in Nasa-Jpl Ion-Dtn, classified under Heap-based Buffer Overflow. CVSS score: 7.5/10. Published 2026-11-09.
- How severe is CVE-2026-123999?
- High severity. CVSS v3 base score is 7.5 out of 10.