CVE-2026-59644

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Source
https://cve.org/CVERecord?id=CVE-2026-59644
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59644.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-59644
Downstream
DEBIAN (1)
openSUSE (2)
SUSE (3)
UBUNTU (1)
Related
openSUSE (2)
SUSE (3)
Published
2026-08-03T00:50:50Z
Modified
2026-10-25T13:15:20Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/U:Amber CVSS Calculator
Summary
MLS hash-ratchet honours arbitrary 32-bit generation counter from sender
Details

In Bouncy Castle for Java before 1.85, MLS hash-ratchet honours arbitrary 32-bit generation counter from sender.

Database specific 
{
    "cna_assigner":  "bcorg",
    "cwe_ids":  [
        "CWE-834"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59644.json"
}
References

Affected packages

Git / github.com/bcgit/bc-java

Affected ranges

Type
GIT
Repo
https://github.com/bcgit/bc-java
Events
Introduced
9032821b326fba9fec7528899dfffa79f9f19aef
Fixed
57fbd3c501f7a369f64eda311d6a709fc0bcae84
Fixed
610d8757d855afe197df0de6d831cb75c81e3b9f
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "1.73"
                },
                {
                    "fixed":  "1.85"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StandardRange"
        },
        {
            "range":  [
                {
                    "fixed":  "610d8757d855afe197df0de6d831cb75c81e3b9f"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        }
    ]
}

Affected versions

Other
r1rv73
r1rv74
r1rv75
r1rv76
r1rv77
r1rv78
r1rv80
r1rv81
r1rv82
r1rv83
r1rv84

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59644.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "306942460679204642382373326531311294129",
            "length":  311
        },
        "id":  "CVE-2026-59644-05a1407c",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/bcgit/bc-java/commit/610d8757d855afe197df0de6d831cb75c81e3b9f",
        "target":  {
            "file":  "mls/src/main/java/org/bouncycastle/mls/GroupKeySet.java",
            "function":  "get"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "220645778715355918153190826735545806309",
                "57035913858609383723540021973489488035",
                "125027476401058781299699804022824585491",
                "96228978241383318008601718473293496267",
                "25324854368272920711548822019957271420",
                "130007600670974637961851151098111701141",
                "102901367100248365111009937930070008712"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-59644-8cbde9cd",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/bcgit/bc-java/commit/610d8757d855afe197df0de6d831cb75c81e3b9f",
        "target":  {
            "file":  "mls/src/main/java/org/bouncycastle/mls/GroupKeySet.java"
        }
    }
]
vanir_signatures_modified 
"2026-10-25T13:15:20Z"