CVE-2026-75935
Memory-allocation DoS in Amazon ion-java via crafted Ion binary (pre-1.12.0)
Is CVE-2026-75935 being exploited?
Not confirmed. CVE-2026-75935 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.44% probability of exploitation in the next 30 days.
How severe is CVE-2026-75935?
CVE-2026-75935 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-75935?
Yes. A fix has been recorded for CVE-2026-75935. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-75935 affect?
CVE-2026-75935 affects Amazon ion-java <1.12.0, Java applications using ion-java, Services parsing Ion binary documents. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-75935?
Upgrade ion-java to version 1.12.0 or later
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote Denial of Service: crafted Ion binary causes excessive heap preallocation leading to OOM/crash of Java process.
Patch when possible
- affected>= 1.9.0 and < 1.12.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.