EUVD-2026-71714Severity by source
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Network-accessible parser with no authentication or interaction required; pure heap-exhaustion DoS with no confidentiality or integrity impact.
Primary rating from Vendor (AMZN).
CVSS VectorVendor: AMZN
Lifecycle Timeline
3DescriptionCVE.org
Improper handling of highly compressed data in Amazon ion-java before 1.12.1 might allow remote attackers to cause a denial of service via a crafted compressed Ion document that expands to an arbitrarily large size upon decompression due to insufficient coverage of the GZIP auto-decompression opt-out introduced for CVE-2026-75936.
To remediate this issue, users should upgrade to version 1.12.1.
AnalysisAI
Decompression bomb handling in Amazon ion-java before version 1.12.1 allows remote unauthenticated attackers to cause denial of service by submitting crafted GZIP-compressed Ion documents that expand to arbitrarily large sizes during automatic decompression. The vulnerability is a bypass of the incomplete fix for CVE-2026-75936, which introduced a GZIP auto-decompression opt-out that did not cover all decompression paths in the library. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target application accepts and parses GZIP-compressed Ion binary documents using ion-java versions prior to 1.12.1, and that the attacker can deliver arbitrary compressed Ion content to that parsing code path - for example, via an HTTP API, message queue, file upload endpoint, or S3-triggered processor that reads Ion-formatted data from external sources. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H) scoring 8.7 accurately characterizes the threat model: network-accessible, unauthenticated, low complexity, and pure availability impact. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: version 1.12.1. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all systems running ion-java prior to version 1.12.1 and assess their exposure to untrusted Ion data sources. …
Sign in for detailed remediation steps and compensating controls.
Threat intelligence, references, and detailed analysis are available after sign-in.
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External POC / Exploit Code
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