`CVE-2026-63621` Apache Camel

Affected software	Apache Camel
Severity	5.3 Medium CVSS 3.1
Fixed in	`4.14.9`, `4.18.4`, `4.22.0`
Weakness	Improper input validation (CWE-20)
Published	24 Aug 2026
Updated	12 Oct 2026

Published 2 months ago. NVD often adds the list of affected products days or weeks after a CVE is published, and the other sources we check lag too. The scope and status here may change.

Description

Improper Input Validation, Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') vulnerability in Apache Camel Knative component The Knative consumer in camel-knative maps inbound CloudEvent attributes onto Camel message headers. In binary content mode the HTTP-header path filters Camel-internal headers through KnativeHttpHeaderFilterStrategy, but in structured content mode (Content-Type application/cloudevents+json) the CloudEvent extension fields are read directly from the JSON body and every extension key is copied into the Exchange headers without applying any HeaderFilterStrategy (CloudEventProcessors, spec versions 1.0, 1.0.1 and 1.0.2). As a result, an unauthenticated attacker can inject Camel-internal headers (e.g. CamelHttpUri, CamelHttpPath, CamelFileName) via a structured-mode CloudEvent request, matched case-insensitively against Camel's header map. When a route forwards messages from a Knative consumer to a header-driven component such as camel-http or camel-file, the injected headers override configured values, enabling server-side request forgery (SSRF), path traversal or message-dispatch redirection depending on the route. This is an incomplete fix of the inbound header filtering previously added for the binary content-mode path, and is the same pattern addressed in camel-cxf/camel-knative (CVE-2026-47323), camel-undertow (CVE-2025-30177), the broader incoming-header filter (CVE-2025-27636 and CVE-2025-29891), and the non-HTTP strategies (CVE-2026-40453). This issue affects Apache Camel: from 3.15.0 before 4.14.9, from 4.15.0 before 4.18.4, from 4.19.0 before 4.21.0. Users are recommended to upgrade to version 4.22.0, which fixes the issue. If users are on the 4.18.x LTS releases stream, then they are suggested to upgrade to 4.18.4. If users are on the 4.14.x LTS releases stream, then they are suggested to upgrade to 4.14.9. The non-LTS releases 4.15.0 through 4.17.0 and 4.19.0 through 4.21.0 are affected but do not receive a maintenance fix; users on those versions should upgrade to 4.18.4 or 4.22.0.

CWE-74

Exploitation status

No public exploit

No exploit has been reported in the sources we check. The 1 repository below are public GitHub repositories with fewer than 5 stars.

CISA KEV not listed
VulnCheck KEV not listed
CISA Vulnrichment exploitation: none
Indexed PoC 1 indexed, none at 5+ stars
EPSS 0.49% chance in 30 days

1 of these are GitHub repositories with fewer than 5 stars. They are listed for reference and don't count toward the exploitation status above.

Index	Artifact	Stars	First seen
GitHub PoC	Reproducer for CVE-2026-63621 (Apache Camel camel-knative structured CloudEvent header injection) — Camel Spring Boot + Camel Quarkus		2026-08-24

Index

Artifact

Stars

First seen

GitHub PoC

Reproducer for CVE-2026-63621 (Apache Camel camel-knative structured CloudEvent header injection) — Camel Spring Boot + Camel Quarkus

2026-08-24

Waratek protection

Protected by Waratek

Waratek has a rule that blocks attacks on this vulnerability.

Protection full Path traversal
Action available security rule
Review automated Inferred
Record active

Decided by	A vulnerability class already blocked by an ARMR security rule
Finding	Protected by Waratek's ARMR path-traversal security rule, which blocks this class of attack at the JVM level without a rule written for this CVE specifically. The CVE's description identifies a path traversal vulnerability. Matched by description (CWE-20, CWE-74 were assigned, but none settles the class on its own).

Decided by

A vulnerability class already blocked by an ARMR security rule

Finding

Protected by Waratek's ARMR path-traversal security rule, which blocks this class of attack at the JVM level without a rule written for this CVE specifically. The CVE's description identifies a path traversal vulnerability. Matched by description (CWE-20, CWE-74 were assigned, but none settles the class on its own).

How to mitigate CVE-2026-63621

Upgrade Apache Camel to a release that fixes it: 4.14.9, 4.18.4 or 4.22.0. Until you can, Waratek RASP blocks exploitation with its path traversal rule. It runs inside the Java application, with no code changes.

Waratek RASP Runtime protection for Java applications

Affected software and releases

Maven packages

Affected and fixed versions, from OSV.dev

Package Introduced Fixed Last affected

org.apache.camel:camel-knative 3.15.0 4.14.9 unbounded

org.apache.camel:camel-knative 4.15.0 4.18.4 unbounded

org.apache.camel:camel-knative 4.19.0 4.22.0 unbounded

Package	Introduced	Fixed	Last affected
`org.apache.camel:camel-knative`	3.15.0	`4.14.9`	unbounded
`org.apache.camel:camel-knative`	4.15.0	`4.18.4`	unbounded
`org.apache.camel:camel-knative`	4.19.0	`4.22.0`	unbounded

Products and versions

2 products, 6 version entries

Source	Vendor	Product	Scheme	Affected versions
nvd	apache	camel	generic	≥ 3.15.0 and ＜ 4.14.9 · ≥ 4.15.0 and ＜ 4.18.4 · ≥ 4.19.0 and ＜ 4.22.0
osv	org.apache.camel	camel-knative	generic	≥ 3.15.0 and ＜ 4.14.9 · ≥ 4.15.0 and ＜ 4.18.4 · ≥ 4.19.0 and ＜ 4.22.0

Source

Vendor

Product

Scheme

Affected versions

nvd

apache

camel

generic

≥ 3.15.0 and ＜ 4.14.9 · ≥ 4.15.0 and ＜ 4.18.4 · ≥ 4.19.0 and ＜ 4.22.0

osv

org.apache.camel

camel-knative

generic

≥ 3.15.0 and ＜ 4.14.9 · ≥ 4.15.0 and ＜ 4.18.4 · ≥ 4.19.0 and ＜ 4.22.0

References

URL	Tags
https://github.com/apache/camel/pull/24724	WEB
https://github.com/apache/camel/pull/24751	WEB
https://github.com/apache/camel/pull/24753	WEB
https://github.com/apache/camel/pull/24768	WEB
https://github.com/apache/camel/commit/4eb26807d40420abf45253286ce3d07c2fba448c	WEB
https://github.com/apache/camel/commit/5c7a8dbf1f1ed92bb4f289a50cc1765095054112	WEB
https://github.com/apache/camel/commit/bbf680af8af4a39f808727758e72d469c2eec539	WEB
https://camel.apache.org/security/CVE-2026-63621.html	WEB
https://github.com/apache/camel	PACKAGE
https://github.com/apache/camel/releases/tag/camel-4.14.9	WEB

URL

Timeline

Published	2026-08-24	By the CVE Program.
NVD record modified	2026-10-12	NVD's own last-modified date for this record.

Published

2026-08-24

By the CVE Program.

NVD record modified

2026-10-12

NVD's own last-modified date for this record.

How VRT decided (17 of 24 rules ran)

17 of 24 rules ran. The rest didn't run because an earlier rule had already settled the CVE.

# Rule Outcome Status Detail

identity: Does this identifier describe a vulnerability at all? the first rule that matches decides

1 rejected no match CVE Program withdrawal of this identifier

scope: Is it a vulnerability Waratek protects? the first rule that matches decides

2 armr-patch-file no match An ARMR patch file on disk for this CVE

3 armr-secure-rule-file no match An ARMR security-rule template on disk for this CVE

4 manual-classification no match A researcher's recorded decision for this specific CVE

5 manual classification no match Manual classification of this CVE in the legacy dataset

6 non-java-upstream no match A root cause in non-Java code: an OS kernel, a C library, or a bundled runtime

7 oracle-component no match The defect being in a component of a tracked product the agent does not reach: JavaFX, the Java SE installer, the JInitiator browser plug-in, the native WebLogic proxy plug-in, or a native part of Oracle Application Server or Collaboration Suite (HTTP Server, Web Cache, Internet Directory, mail and calendar servers). Oracle gives these no CPE of their own and names them only in the description.

8 java-client-side no match Oracle's own risk-matrix note saying the CVE is reached only through untrusted code in the Java sandbox (applets, Web Start) or only through a client installation of Java, so a server running its own trusted code is not exposed

9 osv-maven matched In scope Maven packages: org.apache.camel:camel-knative

10 cna-maven-package not reached An affected Maven artifact named by the CNA itself

11 known-cpe-product not reached An NVD CPE naming a product ARMR tracks

12 cna-cpe-product not reached A CPE the CNA published naming a tracked product. Oracle publishes these on advisory day, months before NVD.

13 oracle-advisory-family not reached A tracked product family named in Oracle's own risk matrix. CPE cannot carry a suite name, only a module.

14 cna-named-product not reached A tracked product named in words by the CVE's own CNA, on a record with no CPE yet. Apache and Eclipse publish these on advisory day, before NVD adds CPE data.

15 non-deployable-product not reached The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached

16 unmatched-product not reached No tracked product matched above, and none present at all

disposition: What do we do about one that is? every rule runs

17 patch-hint no match A reference pointing at the upstream fix: a commit, a PR, a Red Hat bug

18 open-source-maven matched Mitigation candidate Open-source Maven artifact indexed by OSV (Maven packages: org.apache.camel:camel-knative). The source is public, which makes an ARMR patch rule a candidate; nothing here establishes that one can be written.

19 poc-derivable skipped An indexed exploit clearing the evidence bar to reverse-engineer, where there is no source to read

20 no-exploit skipped Nothing to build a rule from yet: no published exploit, no CISA record of exploitation and no source-level change to read

21 secure-rule-match decided it matched Protected by Waratek Description mentions "path traversal" — mitigable by an ARMR path-traversal security rule (none of CWE-20, CWE-74 settles the class on its own).

22 exploited-no-fix-or-poc skipped Somebody exploiting this CVE (a CISA or VulnCheck KEV listing, or a CISA verdict of active exploitation), with no fix, source code or PoC to build a rule from

23 below-action-threshold skipped Medium or Low severity, no CISA or VulnCheck KEV listing, no PoC clearing the evidence bar, no CISA verdict, no Oracle advisory

24 no-exploit-published skipped Exploit code for this candidate, published in a reviewed catalogue or a GitHub repository with 5 or more stars, or in use per CISA or VulnCheck; not only a CISA verdict, a forecast, or nothing at all

Products the scope rules checked

The products this CVE's record names, and whether VRT tracks each one. The scope rules decided on these.

Vendor Product Tracked CPE Source

apache camel tracked cpe:2.3:a:apache:camel:*:*:*:*:*:*:*:* yaml

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