Signed to Unsigned Conversion Error Affecting org.bouncycastle:bcmls-jdk18on package, versions [1.73,1.86)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published4 Oct 2026
- disclosed2 Oct 2026
- creditMirko Swillus
Introduced: 2 Oct 2026
NewCVE-2026-17507 (opens in a new tab)How to fix?
Upgrade org.bouncycastle:bcmls-jdk18on to version 1.86 or higher.
Overview
Affected versions of this package are vulnerable to Signed to Unsigned Conversion Error due to unsigned leaf_index values being compared as signed integers in GroupKeySet.SecretTree.hasLeaf and Group.validateRemove. An attacker can exhaust heap memory and crash the JVM by sending a small MLS message with a wire-encoded leaf_index whose top bit is set, causing the out-of-range sender to pass the membership check and drive NodeIndex.parent() into an unbounded cycle.