CVE-2026-123999

HIGH 7.5

ION-DTN 3.6.2-4.2.0 Heap Buffer Overflow via nm_mgr AMP Rendering

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-122
Vendor	nasa-jpl
Product	ion-dtn
Published	Nov 9, 2026
Last Updated	Nov 9, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

nasa-jpl / ION-DTN

3.6.2 ≤ 4.2.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

SecMate (secmate.dev)