Buffer overflow in Nasa-Jpl Ion-Dtn
CVE-2026-124001
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.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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-rcqq-5qmv-7fxp (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-1b-integer-overflow-heap-corruption-via-dgr (third-party-advisory)
Frequently asked questions
- What is CVE-2026-124001?
- CVE-2026-124001 is a high-severity vulnerability in Nasa-Jpl Ion-Dtn, classified under Integer Overflow or Wraparound. CVSS score: 8.1/10. Published 2026-11-09.
- How severe is CVE-2026-124001?
- High severity. CVSS v3 base score is 8.1 out of 10.