What’s Vulnerable › Vulnerabilities

CVE-2026-84484: ION-DTN before 4.2.0 Out-of-Bounds Read via decodeSdnv

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-02 · updated 2026-09-23
• Weakness: CWE-125

Description

ION-DTN versions before 4.2.0 contain an out-of-bounds read vulnerability in the decodeSdnv function that allows unauthenticated remote attackers to read memory by sending truncated SDNV values. Attackers can send a UDP datagram to the LTP link service input port with a truncated SDNV to trigger reads up to nine bytes past buffer boundaries and underflow byte counters.

Affected products

• nasa-jpl ION-DTN: before 4.2.0 — fixed in 4.2.0

How to fix

Upgrade to a fixed version: nasa-jpl ION-DTN 4.2.0. Check the vendor advisory for mitigations.

References

• https://github.com/nasa-jpl/ION-DTN
• https://github.com/nasa-jpl/ION-DTN/blob/ion-open-source-4.1.4/ici/library/ion.c#L1693
• https://github.com/nasa-jpl/ION-DTN/blob/ion-open-source-4.1.4/ici/library/platform.c#L1982
• https://github.com/nasa-jpl/ION-DTN/commit/d52d22bdd383798712357f86a2778757f740e812
• https://github.com/nasa-jpl/ION-DTN/releases/tag/ion-open-source-4.2.0
• https://github.com/nasa-jpl/ION-DTN/security/advisories/GHSA-85pw-28vw-2jf7
• https://www.vulncheck.com/advisories/ion-dtn-before-4.2.0-out-of-bounds-read-via-decodesdnv
• https://github.com/nasa-jpl/ION-DTN/security/advisories/GHSA-85pw-28vw-2jf7

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