CVE-2026-124000
ION-DTN 2.1.0-4.2.0 Heap Buffer Under-allocation DoS in amsd
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.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| ION-DTN nasa-jpl nasa-jpl/ION-DTN
github |
≥ 2.1.0; ≤ 4.2.0 (affected, semver) 4.2.1-a.2 (unaffected, custom) Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 6.9 medium |
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 | CNA: VulnCheck |
| 3.1 / 5.3 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | CNA: VulnCheck |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/nasa-jpl/ION-DTN/security/advisories/GHSA-h28r-fr59-c79cCNA: VulnCheck · vendor-advisory
- https://github.com/nasa-jpl/ION-DTN/releases/tag/ion-open-source-4.2.1-a.2CNA: VulnCheck · release-notes, patch
- https://www.vulncheck.com/advisories/ion-dtn-heap-buffer-under-allocation-dos-in-amsdCNA: VulnCheck · third-party-advisory
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