CVE-2026-63566

Katalog CVE

CVSS 8.7 · High EPSS 0,37%

Kerentanan Memory Allocation with Excessive Size Value. Skor CVSS 4.0 8.7 (High) menurut CNA.

Deskripsi (NVD)

Memory allocation with excessive size value in the DTLS handshake reassembly (DtlsReliableHandshake, DtlsReassembler) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote unauthenticated DTLS peer to cause a denial of service through memory exhaustion via crafted handshake message fragments, because the reassembly buffer for each incoming handshake message was allocated at the 24-bit length declared in the fragment header, without the check against the peer's maximum handshake message size that TLS already applied. A fragment carrying no payload can force an allocation of almost 16 MB, for each of up to 16 pending messages per handshake, before the handshake is authenticated. DTLS servers and DTLS clients are both affected; TLS is not.

Rincian

Terbit di NVD

2 Oktober 2026

Terakhir diubah

2 Oktober 2026

Status NVD

Undergoing Analysis

CVSS 4.0

8.7 (High), sumber CNA
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-789: Memory Allocation with Excessive Size Value

EPSS (30 hari)

0,37% peluang dieksploitasi; lebih tinggi dari 29,2% CVE lain

Produk dan versi terdampak

NVD belum mencantumkan data produk (CPE) untuk CVE ini. Produk yang terdampak biasanya disebut di deskripsi dan di advisory vendor pada daftar referensi.

Referensi dan perbaikan

• https://github.com/bcgit/bc-csharp/commit/212d06474166d5e85be72c2dd4898313aa5dd5f3
• https://github.com/bcgit/bc-csharp/commit/99afef612458f70f28e7824a09719bfc3a169bda
• https://github.com/bcgit/bc-csharp/wiki/CVE-2026-63566