CVE-2026-75935 PUBLISHED

Memory-amplification denial of service via declared-length preallocation in Amazon ion-java

Assigner: AMZN
Reserved: 18.08.2026 Published: 18.08.2026 Updated: 18.08.2026

Uncontrolled memory allocation in the binary Ion stream cursor in Amazon ion-java before 1.12.0 might allow remote actors to cause a denial of service via a crafted Ion binary document containing a declared-length field that causes excessive heap preallocation.

To remediate this issue, users should upgrade to version 1.12.0.

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 7.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

CVSS Vector: 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
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Amazon Ion
Product	Amazon Ion Java
Versions	Default: unaffected affected from 1.9.0 to 1.12.0 (excl.)

CVE-2026-75935 PUBLISHED

Memory-amplification denial of service via declared-length preallocation in Amazon ion-java

Metrics

Product Status

References

Problem Types

Impacts