EUVD-2026-61174Severity 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-reachable by default with no authentication (PR:N, AV:N), trivially triggered by sending a crafted document (AC:L), with pure availability impact and no confidentiality or integrity effect.
Primary rating from Vendor (ff89ba41-3aa1-4d27-914a-91399e9639e5).
CVSS VectorVendor: ff89ba41-3aa1-4d27-914a-91399e9639e5
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
Lifecycle Timeline
4DescriptionCVE.org
Improper handling of highly compressed data in the GZIP auto-decompression handler in Amazon ion-java before 1.12.0 might allow remote actors to cause a denial of service via a crafted compressed Ion document that expands to an arbitrarily large size upon decompression.
To remediate this issue, users should upgrade to version 1.12.0 and configure withGzipDecompressionEnabled(false) and/or set an explicit withMaximumBufferSize() when parsing untrusted input.
Articles & Coverage 2
AnalysisAI
Denial of service in Amazon ion-java (versions 1.9.0 through 1.11.x) is caused by the GZIP auto-decompression handler failing to enforce any upper bound on decompressed output size (CWE-409), a class of flaw commonly called a decompression bomb or zip bomb. Remote unauthenticated network attackers can submit a specially crafted compressed Ion document that expands to an arbitrarily large payload in memory, exhausting heap resources and crashing or stalling any application that parses untrusted Ion input. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires three conditions: (1) the target application uses ion-java version 1.9.0 through 1.11.x; (2) the application has not explicitly disabled GZIP auto-decompression via withGzipDecompressionEnabled(false) - the vulnerable behavior is on by default; and (3) the application accepts Ion-format input from network-accessible, attacker-controlled sources without pre-validating or size-limiting compressed payloads before passing them to the parser. … 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/VA:H) accurately models the threat: any network-reachable service that ingests Ion documents from untrusted sources via the default ion-java configuration is exploitable without authentication or special attacker capabilities. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker sends a crafted GZIP-compressed binary Ion document - potentially only a few kilobytes in compressed form - to any network endpoint backed by ion-java in its default configuration. The library's auto-decompression handler expands the payload in-memory without limit, consuming gigabytes of JVM heap until an OutOfMemoryError is thrown or the OS terminates the process, denying service to all legitimate users. … |
| Remediation | Upgrade ion-java to version 1.12.0, the vendor-confirmed fix release per the GitHub release tag (https://github.com/amazon-ion/ion-java/releases/tag/v1.12.0) and the AWS security bulletin (https://aws.amazon.com/security/security-bulletins/2026-083-aws/). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, conduct a complete inventory of all applications and services using Amazon ion-java versions 1.9.0-1.11.x using dependency scanning, artifact repositories, and SBOM analysis. …
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Threat intelligence, references, and detailed analysis are available after sign-in.
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External POC / Exploit Code
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