ION-DTN < 4.2.1-a.1 Denial of Service via canonicalizePayloadBlock() Assertion (CVE-2026-75584) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-75584

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

Answer in brief

CVE-2026-75584 records a Unknown severity vulnerability in ION-DTN < 4.2.1-a.1 Denial of Service via canonicalizePayloadBlock() Assertion. The current sources do not mark it as known exploited. The current feed maps nasa-jpl/ION-DTN (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 10, 2026Updated Sep 10, 2026Source checked Sep 10, 2026First seen by HOL Sep 10, 2026Material review Sep 10, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps nasa-jpl/ION-DTN (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
nasa-jpl/ION-DTNgeneric	0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for nasa-jpl/ION-DTN.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 10, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.