DNS disclosure via recursive deserialization allowlist
Published Jul 6, 2026 · Updated Jul 6, 2026
Deserialization in Camel 4.14.0 through 4.14.7, 4.15.0 through 4.18.2, and 4.19.0 through 4.20.0 allows attackers to trigger DNS queries. The default ObjectInputFilter recursively admits java.net classes, so deserializing a HashMap hashes attacker-supplied URL keys and resolves their hosts. Reachability requires an affected consumer to accept serialized bytes without a stricter override; the demonstrated impact is an out-of-band DNS side channel.
Summary
What happened
Deserialization in Camel 4.14.0 through 4.14.7, 4.15.0 through 4.18.2, and 4.19.0 through 4.20.0 allows attackers to trigger DNS queries. The default ObjectInputFilter recursively admits java.net classes, so deserializing a HashMap hashes attacker-supplied URL keys and resolves their hosts. Reachability requires an affected consumer to accept serialized bytes without a stricter override; the demonstrated impact is an out-of-band DNS side channel.
The record
- CVE
- CVE-2026-42527
- Published
- Jul 6, 2026
- Updated
- Jul 6, 2026
- Vendor
- The Apache Software Foundation
- Product
- Apache Camel
- Classifications
- CWE-502
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 6, 2026CVE publishedPublication date reported by the CVE source.
- Jul 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=4.14.0 <4.14.8
- Affected versionversion=4.15.0 <4.18.3
- Affected versionversion=4.19.0 <4.21.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Apache Camel DNS disclosure proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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