Loop with unreachable exit condition in Pkcs12Store.GetCertificateChain in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a crafted PKCS#12 file to an application that loads it and requests a key entry's certificate chain to cause a denial of service, in which the call never returns and consumes CPU and memory until an OutOfMemoryException, via certificates whose issuer links form a cycle, for example two certificates whose AuthorityKeyIdentifier extensions each identify the other's public key. This happens because the chain-building loop stops only when no issuer is found or a certificate links to itself, and keeps no record of certificates already visited. The key-identifier links are followed without checking signatures.
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Affected Vendors & Products
References
History
Wed, 28 Oct 2026 13:30:00 +0000
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Bouncycastle
Bouncycastle bc-csharp |
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| CPEs | cpe:2.3:a:bouncycastle:bc-csharp:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Bouncycastle
Bouncycastle bc-csharp |
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| Metrics |
cvssV3_1
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Sun, 04 Oct 2026 22:15:00 +0000
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Legion Of The Bouncy Castle Inc.
Legion Of The Bouncy Castle Inc. bc-csharp |
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| Vendors & Products |
Legion Of The Bouncy Castle Inc.
Legion Of The Bouncy Castle Inc. bc-csharp |
Fri, 02 Oct 2026 20:30:00 +0000
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ssvc
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Fri, 02 Oct 2026 07:30:00 +0000
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| Description | Loop with unreachable exit condition in Pkcs12Store.GetCertificateChain in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can supply a crafted PKCS#12 file to an application that loads it and requests a key entry's certificate chain to cause a denial of service, in which the call never returns and consumes CPU and memory until an OutOfMemoryException, via certificates whose issuer links form a cycle, for example two certificates whose AuthorityKeyIdentifier extensions each identify the other's public key. This happens because the chain-building loop stops only when no issuer is found or a certificate links to itself, and keeps no record of certificates already visited. The key-identifier links are followed without checking signatures. | |
| Title | Pkcs12Store.GetCertificateChain loops forever on cyclic issuer links | |
| Weaknesses | CWE-835 | |
| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: bcorg
Published: 2026-10-02T07:01:18.029Z
Updated: 2026-10-02T19:13:27.192Z
Reserved: 2026-07-16T23:48:46.076Z
Link: CVE-2026-63570
Updated: 2026-10-02T19:11:53.792Z
Status : Analyzed
Published: 2026-10-02T08:17:01.833
Modified: 2026-10-28T13:23:10.953
Link: CVE-2026-63570
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