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CVE-2026-21945 is a vulnerability in the Oracle Java SE Security component, also affecting Oracle GraalVM for JDK and Oracle GraalVM Enterprise Edition. The issue arises during TLS mutual-authentication client-certificate validation, where Java may process the X.509 Authority Information Access (AIA) extension, specifically the CA Issuers URI, to retrieve missing intermediate certificates. In affected configurations, a malicious client certificate can supply an attacker-controlled AIA URI and cause the Java runtime to initiate outbound requests during certificate path building. Reported demonstrations showed server-side request forgery by directing the runtime to fetch from attacker-chosen HTTP endpoints, including localhost, and denial of service by using resource-exhausting URIs such as file:///dev/urandom. Oracle’s advisory characterizes the issue primarily as remotely exploitable unauthenticated denial of service, resulting in hangs or frequently repeatable crashes. The issue is especially relevant where Java deployments load and run untrusted code or otherwise process untrusted certificate input during sandboxed or mTLS-related operations.
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18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity SSRF vulnerability in Oracle Java that is remotely exploitable without authentication and can be used to exhaust resources, resulting in a denial-of-service condition.
A vulnerability in Java’s certificate path building/validation during TLS mutual authentication (mTLS) when AIA “CA Issuers” fetching is enabled, allowing an attacker-controlled client certificate to coerce the server into fetching attacker-specified URIs (SSRF) and potentially hang/consume resources (DoS), including via non-HTTP URI schemes such as file:// (e.g., file:///dev/urandom).
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.