CVE & CISA-KEV Catalog

CVE-2026-78384

HIGH
7.5
CVSS v3
NVD

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.

CWE-409

How to fix

Remediation Available
cxfNVD
Affected:>= 4.2.0, < 4.2.4Fixed in:4.2.4CVE-2026-78384derived from NVD
Affected:< 3.6.13Fixed in:3.6.13CVE-2026-78384derived from NVD
Affected:>= 4.0.0, < 4.1.9Fixed in:4.1.9CVE-2026-78384derived from NVD

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityNone
AvailabilityNone

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

Exploit Intelligence

0.37%probability of exploitation in 30 days
30thpercentile

Low risk: more likely to be exploited than 30% of all known CVEs.

References

Vendor Advisory1
Third-Party Advisory1

Related Vulnerabilities

Other CWE-409 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2026-49975High7.54.2%-Fix
CVE-2026-21441High7.52.9%-Fix
CVE-2024-43499High7.52.6%-Fix
CVE-2024-28180Medium4.32.0%-Fix
CVE-2017-16129Medium5.91.7%-Fix
CVE-2022-29225High7.51.6%-Fix

Common questions

How do I fix CVE-2026-78384?

Upgrade cxf to 4.2.4 or later.

Is CVE-2026-78384 being actively exploited?

Not that we know of. CVE-2026-78384 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.37% is the estimated probability that it will be exploited in the next 30 days. That is higher than 30% of all scored CVEs.

How severe is CVE-2026-78384?

CVE-2026-78384 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-78384 affect?

Published advisories record a fix for cxf (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-10-20.