CompressionUtils.inflate() decompressed attacker-controlled DEFLATE data with no output-size cap. A small (~KB) crafted payload could expand to gigabytes on the heap. Reachable via JWE decryption when zip=DEF (e.g. JoseSessionTokenProvider with RSA-OAEP key wrap) and via SAML redirect/POST binding token inflation — in both cases decompression happens before/independent of trust validation.
Fix: Added a configurable maximum inflated-size cap (default 10 MiB, org.apache.cxf.compression-max-inflated-size system property) to CompressionUtils.inflate(); aborts with DataFormatException once exceeded.
Users are recommended to upgrade to versions 4.2.4 or 4.1.9 or 3.6.13, which fix this issue.
References
| Link | Resource |
|---|---|
| https://lists.apache.org/thread.html/xoh63rlxn0m9koft5j4jxrfd0hf81v3q | Issue Tracking Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2026/10/09/6 | Mailing List Third Party Advisory |
Configurations
Configuration 1 (hide)
|
History
20 Oct 2026, 12:43
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:apache:cxf:*:*:*:*:*:*:*:* | |
| References | () https://lists.apache.org/thread.html/xoh63rlxn0m9koft5j4jxrfd0hf81v3q - Issue Tracking, Vendor Advisory | |
| References | () http://www.openwall.com/lists/oss-security/2026/10/09/6 - Mailing List, Third Party Advisory | |
| First Time |
Apache cxf
Apache |
15 Oct 2026, 17:17
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-409 | |
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.5 |
09 Oct 2026, 12:17
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
09 Oct 2026, 11:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-10-09 11:17
Updated : 2026-10-20 12:43
NVD link : CVE-2026-78384
Mitre link : CVE-2026-78384
CVE.ORG link : CVE-2026-78384
JSON object : View
Products Affected
apache
- cxf
CWE
CWE-409
Improper Handling of Highly Compressed Data (Data Amplification)