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CVE-2021-43859 is an uncontrolled resource-consumption vulnerability in XStream versions earlier than 1.4.19. A crafted XML input stream containing highly recursive collections or maps can cause disproportionately long collection-update processing, consuming all available CPU time. XStream 1.4.19 adds elapsed-time monitoring for collection-element additions and raises an exception when the configured threshold is exceeded.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
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.
XStream denial of service through highly recursive collections or maps.
An XStream denial-of-service vulnerability triggered by injecting highly recursive collections or maps.
Denial-of-service vulnerability in XStream caused by injecting highly recursive collections or maps.
A denial-of-service vulnerability in the XStream Java object/XML serialization library. Crafted input can cause excessive CPU consumption through recursion or expensive collection-element processing.
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.