Advisory [CVE-2026-50645] Apache CXF: No restriction on attachment headers per message
This security Apache Software Foundation advisory covers CVE-2026-50645 affecting Apache CXF.
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Summary
There is no restriction on the amount of attachment headers that a message can contain when being deserialized by Apache CXF, which can lead to uncontrolled resource consumption or a denial of service attack.
Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fix this issue by imposing a maximum default of 500 attachments per message.
- Apache CXF 4.2.0 before 4.2.2
- Apache CXF 4.0.0 before 4.1.7
- Apache CXF before 3.6.12
Official advisory · medium-confidence parse· fetched 3 months ago·verify at source
- 4.2.2
- 4.1.7
- 3.6.12
Official advisory · medium-confidence parse· fetched 3 months ago·verify at source
Mitigation checklist
- Users are recommended to upgrade to versions 4.2.2 or 4.1.7 or 3.6.12, which fix this issue by imposing a maximum default of 500 attachments per message.
Official advisory · medium-confidence parse· fetched 3 months ago·verify at source
More Apache Software Foundation advisories
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- CVE-2026-107937Oct 9, 2026In Apache CXF, the parser for multipart/MTOM attachment part headers did not fully enforce
- CVE-2026-100227Oct 9, 2026Improper Verification of Cryptographic Signature vulnerability in Apache CXF's JAX-RS XML
- CVE-2026-97791Oct 9, 2026In Apache CXF, STSTokenValidator checks whether a SAML assertion is signed by a trusted
- CVE-2026-97468Oct 9, 2026Apache CXF's STSTokenValidator and Security Token Service (STS) cached validated security
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