CVE-2026-75584

ION-DTN < 4.2.1-a.1 Denial of Service via canonicalizePayloadBlock() Assertion

State: Published
Severity: 8.7 High
Published: Sep 10, 2026
Updated: Sep 18, 2026
Reserved: Aug 17, 2026

Description

ION-DTN before 4.2.1-a.1 contains a denial of service vulnerability that allows unauthenticated remote attackers to crash the ION process by sending a BPv7 bundle with a zero-length payload. The canonicalizePayloadBlock() function in bpsec_util.c passes bundle->payload.length to zco_clone() without validating it against zero, causing a failed CHKZERO assertion that triggers sm_Abort() and terminates the process with SIGABRT before any HMAC verification occurs, requiring no valid key or credential to exploit.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	VulnCheck
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	VulnCheck

Weaknesses

CWE-617 Reachable Assertion

Affected Products

Product	Versions
ION-DTNnasa-jpl	4.2.0 and earlierAffected 4.2.1-a.1Not affected

References

GitHub Security Advisory (GHSA-9vgc-2r6g-6qwf)vendor-advisory
https://www.vulncheck.com/advisories/ion-dtn-a-1-denial-of-service-via-canonicalizepayloadblock-assertionthird-party-advisory

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