CVE-2026-63578 Legion of the Bouncy Castle Inc. bc-csharp - Denial of Service

Legion of the Bouncy Castle Inc. bc-csharp < 2.7.0 contains a denial of service caused by unbounded iteration count in password-based private-key decryption (PbeUtilities.GenerateCipherParameters), letting attackers cause CPU exhaustion via crafted encrypted private keys, exploit requires supplying a crafted encrypted private key.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.33% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS 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/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
Published
2 October 2026
Updated
15 October 2026
Weakness
CWE-770

Vendor fix

Update to version 2.7.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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