CVE-2026-16000

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Source

https://cve.org/CVERecord?id=CVE-2026-16000

Import Source

https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-16000.json

JSON Data

https://api.osv.dev/v1/vulns/CVE-2026-16000

Published

2026-10-02T06:54:23Z

Modified

2026-10-04T02:46:53Z

Severity

8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

KCcmBlockCipher (DSTU 7624 CCM) tag not bound to nonce when no associated data is used

Details

Missing cryptographic step in the DSTU 7624 CCM mode implementation (KCcmBlockCipher) in Legion of the Bouncy Castle Inc. bc-csharp before 2.7.0 allows an attacker who can observe encrypted messages of known or chosen content to forge ciphertexts with valid authentication tags, via messages encrypted without associated data. The cause is that the G1 block, which binds the nonce, the message length and the parameter flags into the CBC-MAC, was processed only when associated data was present. Without associated data the tag was a CBC-MAC of the plaintext alone, independent of the nonce. Only applications that use KCcmBlockCipher directly and supply no associated data are affected.

Database specific

{
    "cna_assigner":  "bcorg",
    "cwe_ids":  [
        "CWE-325"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/16xxx/CVE-2026-16000.json"
}

References

Affected packages

Git / github.com/bcgit/bc-csharp

Affected ranges

Type

GIT

Repo

https://github.com/bcgit/bc-csharp

Events

Introduced

Fixed

4007498b13582d90ee1eda5d9920c324428b98b3

Fixed

b01e9e6c0e231b90867fbaf03bf148bde6f9ccfb

Database specific

Show details

{
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "2.7.0"
        }
    ],
    "source":  [
        "DESCRIPTION",
        "REFERENCES"
    ]
}

Affected versions

release-1.*

release-1.8.0

release-1.8.0-RC.1

release-1.8.0-RC.2

release-1.8.0-RC.3

release-1.8.0-beta.1

release-1.8.0-beta.2

release-1.8.0-beta.3

release-1.8.0-beta.4

release-1.8.1

release-1.8.10

release-1.8.2

release-1.8.3

release-1.8.4

release-1.8.5

release-1.8.6

release-1.8.7

release-1.8.8

release-1.9.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-16000.json"