Memory allocation with excessive size value in the OpenPGP signature and user attribute subpacket parsers (SignatureSubpacketsParser.ReadPacket, UserAttributeSubpacketsParser.ReadPacket) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows a remote, unauthenticated attacker who can supply a crafted OpenPGP public key, certificate or signature to cause a denial of service (OutOfMemoryException or memory exhaustion in the parsing process) via a subpacket header using the five-octet length form, because the declared length was used to size the subpacket buffer with no upper bound and without being compared with the size of the enclosing subpacket area or packet, so a few bytes of input could demand an allocation of up to about 2 GB before any subpacket data was read.
References
Configurations
History
28 Oct 2026, 13:09
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:a:bouncycastle:bc-csharp:*:*:*:*:*:*:*:* | |
| First Time |
Bouncycastle bc-csharp
Bouncycastle |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.5 |
| References | () https://github.com/bcgit/bc-csharp/commit/986fb4892bb39f292ba0fd82eba11d2cbc503217 - Patch | |
| References | () https://github.com/bcgit/bc-csharp/commit/f51dacf4817d9ea10d0a9841f72fac3655c65483 - Patch | |
| References | () https://github.com/bcgit/bc-csharp/wiki/CVE-2026-63574 - Patch, Vendor Advisory |
02 Oct 2026, 08:17
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-10-02 08:17
Updated : 2026-10-28 13:09
NVD link : CVE-2026-63574
Mitre link : CVE-2026-63574
CVE.ORG link : CVE-2026-63574
JSON object : View
Products Affected
bouncycastle
- bc-csharp
CWE
CWE-789
Memory Allocation with Excessive Size Value