Bug 2555523 (CVE-2026-85296)

Summary: CVE-2026-85296 org.apache.camel/camel-as2: org.apache.camel/camel-as2-api: Apache Camel AS2: Information disclosure via shared request signing state
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: gmalinko, janstey, pdelbell, rstepani
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Apache Camel AS2 component. Cryptographic signing material belonging to an individual transaction was stored in a shared state across requests rather than isolated to the active request. Under concurrent network traffic in multi-partner deployments, delivery receipts, known as Message Disposition Notifications (MDNs), can be signed using another partner's cryptographic key. This issue results in cross-partner key confusion and unauthorized information disclosure between trading partners.
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Description OSIDB Bzimport 2026-10-19 10:55:26 UTC 
Exposure of Data Element to Wrong Session vulnerability in Apache Camel AS2 component.

This issue affects Apache Camel: from 4.0.0 before 4.18.5, from 4.19.0 before 4.22.1.

Signing material belonging to an individual request was stored in state that is shared across requests rather than confined to the request being processed. Where a deployment serves more than one trading partner, concurrent or successive requests could therefore observe each other's material, and a Message Disposition Notification could be signed with the key of a partner other than the one the receipt was for. The result is cross-partner key confusion: a receipt attributable to the wrong partner, and one partner's signing material used while handling another partner's exchange. AS2 deployments are typically multi-partner by design, so the condition is reached by ordinary concurrent traffic rather than by anything the attacker must arrange.

Upgrade to Apache Camel 4.23.0, which fixes the issue. Users on the 4.18.x LTS releases stream should upgrade to 4.18.5. Users on the 4.22.x LTS releases stream should upgrade to 4.22.1. Per-request signing keys are now confined to the request being processed in ResponseMDN. For deployments that cannot upgrade immediately, run a separate Camel context per trading partner so that no signing material is shared between them.