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CVE-2026-91858— Apache Camel: Camel-FOP Resolves External DTDs and Entities From Untrusted XSL-FO Input When a Third-Party JAXP TransformerFactory Is Present

Quick assessment

Affected
Apache Software Foundation Apache Camel
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.

FopProducer 在转换传入的 XSL-FO 消息体时，会通过调用 创建一个 ，并仅启用 特性，随后对消息体执行恒等转换（identity transform）。在 JDK 内置的转换器中，仅启用该特性即可将 和 的限制设置为空，从而拒绝外部 DTD 或外部实体。然而，当类路径中存在第三方 JAXP （例如 Saxon-HE，通常是因为应用同时使用了 或 组件）时， 会返回该第三方实现；而在此实现上，仅启用 并不能限制对外部资源的访问。因此，如果 XSL-FO 文档中声明了包含外部子集的 DOCTYPE 或外

CVSS 6.5 · Medium
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I. Basic Information for CVE-2026-91858

Vulnerability Information
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Vulnerability Title
Apache Camel: Camel-FOP Resolves External DTDs and Entities From Untrusted XSL-FO Input When a Third-Party JAXP TransformerFactory Is Present
Source: CVE Program / CVE List V5
Vulnerability Description
FopProducer transforms the incoming XSL-FO message body by creating a javax.xml.transform.TransformerFactory through TransformerFactory.newInstance() and enabling only FEATURE_SECURE_PROCESSING before running an identity transform over the body. On the JDK's built-in transformer, that feature alone already empties the accessExternalDTD and accessExternalStylesheet limits, so an external DTD or entity is refused. When a third-party JAXP TransformerFactory such as Saxon-HE is on the classpath, for example because the application also uses camel-xslt-saxon or camel-saxon, TransformerFactory.newInstance() returns that implementation instead, and FEATURE_SECURE_PROCESSING on its own does not restrict external resource access on it. A DOCTYPE with an external subset, or an external general entity, declared in the XSL-FO document is then resolved and expanded while the body is transformed. An external sender whose XSL-FO reaches a fop producer could therefore read files readable by the Camel process and cause the process to issue requests to hosts the document names. camel-fop does not bring such a factory itself, and excludes Xalan, so a default deployment using the JDK transformer is not affected; the issue is reachable only where another component has placed an alternative JAXP TransformerFactory on the classpath. Releases on the 4.14.x line and earlier reached end of life before this issue was resolved and do not receive a fix.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
XML外部实体引用的不恰当限制(XXE)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Camel 4.0.0 ~ 4.18.5 -

II. Public POCs for CVE-2026-91858

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III. Intelligence Information for CVE-2026-91858

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Patches & Fixes for CVE-2026-91858 (3)

Vendor Advisories for CVE-2026-91858 (2)

Same Patch Batch · Apache Software Foundation · 2026-10-19 · 62 CVEs total

CVE-2026-78162 10.0 CRITICAL Apache Camel: Camel-Hazelcast Managed Instances Missing Java Deserialization Filter (Incom
CVE-2026-88900 8.8 HIGH Apache Camel: Camel-JGroups: Unsafe Java Deserialization of Cluster Messages in the JGroup
CVE-2026-83531 8.8 HIGH Apache Camel: Camel-Dynamic-Router Control Endpoint Compiles Predicate Expressions Supplie
CVE-2026-78165 8.8 HIGH Apache Camel: Camel-Spring-Redis Unfiltered Java Deserialization of Redis Payloads
CVE-2026-78164 8.2 HIGH Apache Camel: HTTP producers resolve property placeholders in message-supplied URI overrid
CVE-2026-80312 8.2 HIGH Apache Camel: Camel-OAuth Authentication Bypass via Fail-Open Processors
CVE-2026-80343 8.2 HIGH Apache Camel: Camel-Netty-HTTP Security Constraint Bypass via Case-Sensitive Context-Path
CVE-2026-80344 8.2 HIGH Apache Camel: Camel-AS2 Server-Side Request Forgery and Credential Disclosure via Asynchro
CVE-2026-88901 8.2 HIGH Apache Camel: Camel-Smooks XML External Entity Processing, external entities resolved by d
CVE-2026-85251 7.5 HIGH Apache Camel: Camel-HTTP Credential Disclosure to Cross-Host Redirect Targets
CVE-2026-85250 7.5 HIGH Apache Camel: Camel-XPath XML External Entity Processing and File Disclosure via the docum
CVE-2026-79986 7.4 HIGH Apache Camel: camel-azure-files resolved the remote path of a polled file from the name re
CVE-2026-79984 7.4 HIGH Apache Camel: camel-mina-sftp resolved the remote path of a polled file from the name repo
CVE-2026-79985 7.4 HIGH Apache Camel: camel-smb resolved the remote path of a polled file from the name reported i
CVE-2026-79983 7.4 HIGH Apache Camel: camel-ftp resolved the remote path of a polled file from the name reported i
CVE-2026-85254 6.5 MEDIUM Apache Camel: Camel-Platform-HTTP Request-Header Echo Suppression Bypassed by Header-Name
CVE-2026-85249 6.5 MEDIUM Apache Camel: Camel-Tika Header Injection via Unfiltered Document Metadata
CVE-2026-84176 6.5 MEDIUM Apache Camel: Camel-Platform-HTTP-Vertx Cross-Origin Credential Exposure via Wildcard Orig
CVE-2026-85314 6.5 MEDIUM Apache Camel: Camel-Mail Header Injection via Unfiltered mail.smtp Headers in the MimeMult
CVE-2026-85296 6.5 MEDIUM Apache Camel: Camel-AS2 Cross-Partner Signing Key Confusion via Shared Per-Request State

Showing top 20 of 62 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Apache Camel
Same vendor: Apache Software Foundation
Same weakness: CWE-611

V. Comments for CVE-2026-91858

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