CVE-2026-75584

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

Assigner: VulnCheck
Reserved: 17.08.2026 Published: 10.09.2026 Updated: 10.09.2026

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.

Metrics

CVSS Vector: 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
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 7.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	nasa-jpl
Product	ION-DTN
Versions	Default: unaffected affected from 0 to 4.2.0 (incl.) Version 4.2.1-a.1 is unaffected

Vendor

nasa-jpl

Product

ION-DTN

Versions

Default: unaffected

affected from 0 to 4.2.0 (incl.)
Version 4.2.1-a.1 is unaffected

Credits

Asadbek Fatullayev finder
VulnCheck coordinator

References

Problem Types