Allocation of resources without limits in PKCS#12 keystore loading (Pkcs12Store.Load) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a PKCS#12 (PFX) file to cause a denial of service through CPU exhaustion via an iteration count close to 2^31 in the file's MacData or in the PBE parameters of an encrypted SafeContents or shrouded key bag, because the counts are taken from the file without an upper bound and the key derivation runs before the MAC or the password can be checked. A zero or negative count is covered by CVE-2026-63575. Pkcs12Utilities.ConvertToDefiniteLength is also affected.
History

Wed, 28 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
First Time appeared Bouncycastle
Bouncycastle bc-csharp
CPEs cpe:2.3:a:bouncycastle:bc-csharp:*:*:*:*:*:*:*:*
Vendors & Products Bouncycastle
Bouncycastle bc-csharp
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Sun, 04 Oct 2026 22:15:00 +0000

Type Values Removed Values Added
First Time appeared Legion Of The Bouncy Castle Inc.
Legion Of The Bouncy Castle Inc. bc-csharp
Vendors & Products Legion Of The Bouncy Castle Inc.
Legion Of The Bouncy Castle Inc. bc-csharp

Fri, 02 Oct 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 02 Oct 2026 07:30:00 +0000

Type Values Removed Values Added
Description Allocation of resources without limits in PKCS#12 keystore loading (Pkcs12Store.Load) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a PKCS#12 (PFX) file to cause a denial of service through CPU exhaustion via an iteration count close to 2^31 in the file's MacData or in the PBE parameters of an encrypted SafeContents or shrouded key bag, because the counts are taken from the file without an upper bound and the key derivation runs before the MAC or the password can be checked. A zero or negative count is covered by CVE-2026-63575. Pkcs12Utilities.ConvertToDefiniteLength is also affected.
Title Unbounded MAC and bag-decryption iteration counts when loading PKCS#12 files
Weaknesses CWE-770
References
Metrics cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: bcorg

Published: 2026-10-02T07:04:37.676Z

Updated: 2026-10-02T19:18:59.623Z

Reserved: 2026-07-16T23:50:45.118Z

Link: CVE-2026-63572

cve-icon Vulnrichment

Updated: 2026-10-02T19:18:51.529Z

cve-icon NVD

Status : Analyzed

Published: 2026-10-02T08:17:02.157

Modified: 2026-10-28T13:17:43.130

Link: CVE-2026-63572

cve-icon Redhat

No data.