Memory Allocation with Excessive Size Value Affecting bouncycastle.cryptography package, versions [,2.7.0)
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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- published6 Oct 2026
- disclosed2 Oct 2026
Introduced: 2 Oct 2026
NewCVE-2026-103603 (opens in a new tab)How to fix?
Upgrade BouncyCastle.Cryptography to version 2.7.0 or higher.
Overview
Affected versions of this package are vulnerable to Memory Allocation with Excessive Size Value via the HSS public key and signature parsing in HssPublicKeyParameters and HssSignature. An attacker can exhaust memory by supplying a malicious HSS public key with an excessive level count and a signature for verification, causing the parser to allocate oversized internal arrays before it has validated the structure.