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CVE-2026-21925 is a difficult-to-exploit vulnerability in the RMI component of Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition. An unauthenticated network attacker can bypass security controls to read or modify portions of data accessible to the affected runtime. Affected supported versions are Oracle Java SE 8u471, 8u471-b50, 8u471-perf, 11.0.29, 17.0.17, 21.0.9, and 25.0.1; Oracle GraalVM for JDK 17.0.17 and 21.0.9; and Oracle GraalVM Enterprise Edition 21.3.16. Exploitation can occur through services supplying data to RMI component APIs. The vulnerability also affects client deployments that execute untrusted sandboxed Java Web Start applications or Java applets and rely on the Java sandbox for security. The underlying implementation defect and vulnerable function are not specified.
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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 public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
19 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability referenced by a TuxCare CentOS 8.5 local security advisory; no technical flaw description is provided.
A vulnerability referenced by the AlmaLinux 9.6 TuxCare security update; no technical details are provided.
A vulnerability referenced by an Alma Linux 9.2 security-check advisory; the supplied content provides no technical vulnerability details.
A vulnerability referenced by the Alma Linux 9.6 TuxCare local security-check advisory; no technical details are supplied.
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.