CVE-2026-75584 ION-DTN < 4.2.1-a.1 Denial of Service via canonicalizePayloadBlock() Assertion
Unauthenticated remote attackers can crash the ION-DTN process by sending a BPv7 bundle with a zero-length payload, causing an assertion failure.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-75584?
CVE-2026-75584 is a high-severity denial of service vulnerability in nasa-jpl ION-DTN, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-617
Which versions are affected by CVE-2026-75584?
How do I fix CVE-2026-75584?
No fix has been published for CVE-2026-75584 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-75584 being exploited?
There is no known exploitation of CVE-2026-75584 in the wild and no public exploit code.
Sources
Also known as GHSA-9vgc-2r6g-6qwf.