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CVE-2026-78384— Apache CXF: Unbounded DEFLATE Decompression in CXF JOSE/JWE and SAML Processing (Decompression Bomb)

Quick assessment

Affected
Apache Software Foundation Apache CXF
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

漏洞描述： CompressionUtils.inflate() 方法在解压攻击者控制的 DEFLATE 格式数据时，未设置输出大小的上限。攻击者可构造一个体积较小（约 KB 级别）的恶意载荷，在解压后导致堆内存膨胀至 GB 级别，从而引发拒绝服务或内存耗尽攻击。该漏洞可通过以下两种途径触发： 1. JWE 解密过程中，当压缩方式为 时（例如使用 RSA-OAEP 密钥包装的 JoseSessionTokenProvider）； 2. SAML 重定向或 POST 绑定方式下的令牌解压过程。 在上述两种场景中，解压

AI Predicted 7.5 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-78384

Vulnerability Information
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Vulnerability Title
Apache CXF: Unbounded DEFLATE Decompression in CXF JOSE/JWE and SAML Processing (Decompression Bomb)
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache CXF 4.2.0 ~ 4.2.4 -

II. Public POCs for CVE-2026-78384

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III. Intelligence Information for CVE-2026-78384

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Other References for CVE-2026-78384 (1)

Same Patch Batch · Apache Software Foundation · 2026-10-09 · 13 CVEs total

CVE-2026-103413 8.8 HIGH Apache Camel Karavan: unvalidated Kubernetes resources applied from a project's kubernetes
CVE-2026-103412 8.8 HIGH Apache Camel Karavan: project file name path traversal when committing a project to Git
CVE-2026-108039 Apache CXF: Prevent unbounded XML document size in StaxUtils by adding default element and
CVE-2026-107938 Apache CXF: The Netty HTTP client transport does not perform TLS hostname verification.
CVE-2026-107937 Apache CXF: The attachment header size and count limits can be bypassed, which allows deni
CVE-2026-100227 Apache CXF: XML Signature wrapping in JAX-RS XML Security
CVE-2026-97791 Apache CXF: STSTokenValidator can accept untrusted SAML assertions because it shares valid
CVE-2026-97468 Apache CXF: Authentication bypass via weak cache keys for validated STS tokens
CVE-2026-86463 Apache CXF: FIQL Query Parser Denial of Service
CVE-2026-79650 Apache CXF: OIDC RP Open Redirect
CVE-2026-73179 Apache CXF: JPA authorization-code consume is non-atomic
CVE-2026-71575 Apache CXF: Inoperative max_age authentication-freshness check in OidcClientCodeRequestFil

IV. Related Vulnerabilities

Same product: Apache CXF
Same vendor: Apache Software Foundation

V. Comments for CVE-2026-78384

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