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  4. CVE 2026 78384 apache cxf unbounded deflate decompression in cxf
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Back to active CVEs
Unknown severity · Source severity not reportedCVE-2026-78384

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

Answer in brief

CVE-2026-78384 records a Unknown severity vulnerability in Apache CXF: Unbounded DEFLATE Decompression in CXF JOSE/JWE and SAML Processing (Decompression Bomb). The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/org.apache.cxf:cxf-core (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 9, 2026Updated Oct 9, 2026Source checked Oct 9, 2026First seen by HOL Oct 9, 2026Material review Oct 9, 2026
Upstream Advisory

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/org.apache.cxf:cxf-core (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Apache Software Foundation/org.apache.cxf:cxf-coregeneric>=4.2.0 <4.2.4 || >=4.0.0 <4.1.9 || >=0 <3.6.134.2.4, 4.1.9, 3.6.13

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/org.apache.cxf:cxf-core.
  2. 2Review the reported fix. Update Apache Software Foundation/org.apache.cxf:cxf-core to 4.2.4 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 9, 2026

Sources and claim methodology

  • Source referencelists.apache.org
  • Source referenceopenwall.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Apache CXF: The attachment header size and count limits can be bypassed, which allows denial of service through memory exhaustion.Same apache software foundation/org.apache.cxf package
  • Apache CXF: Prevent unbounded XML document size in StaxUtils by adding default element and character limitsSame apache software foundation/org.apache.cxf package
  • Apache CXF: XML Signature wrapping in JAX-RS XML SecuritySame generic ecosystem
  • Super Payments < 1.43.1 - Unauthenticated Payment Confirmation Forgery via Webhook SignatureSame generic ecosystem
  • Envira Gallery Lite < 1.16.2 Missing Authorization via Gallery Conversion REST EndpointSame generic ecosystem
  • WordPress Quiz And Survey Master plugin <= 11.2.7 - PHP Object Injection vulnerabilitySame generic ecosystem

Record context

Vulnerability class
Secret Exfiltration
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Oct 9, 2026
References
2 linked sources
Open source record