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CVE-2026-86463— Apache CXF: FIQL Query Parser Denial of Service

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.

Apache CXF 的 FIQL 查询解析器在处理查询表达式中的运算符搜索时存在漏洞。当解析器遇到一个较长的、不包含运算符的字符串时，其搜索模式可能会陷入尝试大量组合的死循环，从而导致解析器消耗过量的 CPU 资源。攻击者可以通过发送精心构造的查询请求，使服务器 CPU 资源耗尽，进而可能减缓甚至阻断其他正常请求的处理。为修复该问题，默认将 FIQL 表达式的长度限制为 4 KiB，既防止攻击者发送超长输入，又确保正常查询功能不受影响。 建议用户升级至 4.2.4、4.1.9 或 3.6.13 版本，以修复此安全

AI Predicted 5.9 Difficulty: Easy

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-86463

Vulnerability Information
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Vulnerability Title
Apache CXF: FIQL Query Parser Denial of Service
Source: CVE Program / CVE List V5
Vulnerability Description
Apache CXF's FIQL query parser has a vulnerability in how it searches for operators in query expressions. The search pattern can get stuck trying many combinations when it encounters a long string without an operator, causing the parser to consume excessive CPU time. An attacker can send a crafted query to make the server use up CPU resources, potentially slowing down or stopping other requests. The fix was to limit FIQL expressions to 4 KiB by default, preventing attackers from sending extremely long inputs while still allowing normal queries. 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-2026-86463

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III. Intelligence Information for CVE-2026-86463

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Other References for CVE-2026-86463 (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-2026-79650 Apache CXF: OIDC RP Open Redirect
CVE-2026-78384 Apache CXF: Unbounded DEFLATE Decompression in CXF JOSE/JWE and SAML Processing (Decompres
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-2026-86463

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