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CVE-2026-84647 is a type-confusion vulnerability in Stapler form data binding, included in Jenkins 2.579 and earlier and Jenkins LTS 2.568.2 and earlier. Affected Stapler versions do not constrain object instantiation from bound form data to types compatible with the target field's expected type. Consequently, an authenticated user with Overall/Read permission can cause Stapler to instantiate unintended configuration-related object types through a field not intended to accept them. Stapler 2088.2093.vd7c3e58008a_6 is explicitly unaffected.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Jenkins/Jenkins LTS vulnerability addressed through FreeBSD package security updates; the content provides no vulnerability-class or technical-impact detail.
An improper type restriction vulnerability in Stapler form-data binding, bundled with Jenkins, that lets attackers holding Overall/Read permission instantiate configuration-related object types incompatible with an expected field type.
Unknown; the vulnerability is referenced as affecting the identified Jenkins release range, but no technical description is provided.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.