CVE-2026-59640

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Source
https://cve.org/CVERecord?id=CVE-2026-59640
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-59640.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-59640
Downstream
Related
Published
2026-08-03T00:55:19.062Z
Modified
2026-08-14T18:56:41.577863278Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/U:Amber CVSS Calculator
Summary
OpenPGP CFB quick-check oracle active on symmetric/session-key paths
Details

In Bouncy Castle for Java before 1.85, OpenPGP CFB quick-check oracle active on symmetric/session-key paths. This issue also affects Bouncy Castle for Java LTS before 2.73.12, and Bouncy Castle for Java FIPS (BC-FJA) before bcpg-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).

Database specific 
{
    "cna_assigner": "bcorg",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59640.json",
    "cwe_ids": [
        "CWE-203"
    ],
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "introduced": "1.0.0"
                },
                {
                    "fixed": "1.0.13"
                },
                {
                    "introduced": "2.0.0"
                },
                {
                    "fixed": "2.0.13"
                },
                {
                    "introduced": "2.1.0"
                },
                {
                    "fixed": "2.1.13"
                }
            ],
            "source": "AFFECTED_FIELD"
        }
    ]
}
References

Affected packages

Git / github.com/bcgit/bc-java

Affected ranges

Type
GIT
Repo
https://github.com/bcgit/bc-java
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
57fbd3c501f7a369f64eda311d6a709fc0bcae84
Fixed
6b94b1c146cec1f565d9a85847fae511af77503e
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.85"
        }
    ],
    "source": [
        "DESCRIPTION",
        "REFERENCES"
    ]
}
Type
GIT
Repo
https://github.com/bcgit/bc-lts-java
Events
Introduced
468b5082f3f0971e80bf9edb7029c17b39b9ba0c
Fixed
f101b232c5d3e07ecdd504210a57e43831d6cd65
Database specific
Show details 
{
    "extracted_events": [
        {
            "introduced": "2.73.0"
        },
        {
            "fixed": "2.73.12"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

Other
r1rv73
r1rv74
r1rv75
r1rv76
r1rv77
r1rv78
r1rv80
r1rv81
r1rv82
r1rv83
r1rv84
r2rv73dot0
r2rv73dot1
r2rv73dot10
r2rv73dot11
r2rv73dot3
r2rv73dot4
r2rv73dot6
r2rv73dot8
r2rv73dot9

Database specific

vanir_signatures 
[
    {
        "signature_version": "v1",
        "target": {
            "file": "pg/src/main/java/org/bouncycastle/openpgp/PGPEncryptedData.java"
        },
        "deprecated": false,
        "id": "CVE-2026-59640-041c810f",
        "signature_type": "Line",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "50671578365308108760643708027735425608",
                "150742747253640397634823343255313346329",
                "39678005526965916117473944015363706759",
                "141863827011499454410954670095034628019",
                "51875940390146466152230553609664151542",
                "39781507606215086323376859966086771922",
                "160037360228391233706860524767532318468"
            ]
        },
        "source": "https://github.com/bcgit/bc-java/commit/6b94b1c146cec1f565d9a85847fae511af77503e"
    },
    {
        "signature_version": "v1",
        "target": {
            "function": "performTest",
            "file": "pg/src/test/java/org/bouncycastle/openpgp/test/PGPSessionKeyTest.java"
        },
        "deprecated": false,
        "id": "CVE-2026-59640-1f35606a",
        "signature_type": "Function",
        "digest": {
            "length": 159.0,
            "function_hash": "102217122924963623284000505256155763149"
        },
        "source": "https://github.com/bcgit/bc-java/commit/6b94b1c146cec1f565d9a85847fae511af77503e"
    },
    {
        "signature_version": "v1",
        "target": {
            "file": "pg/src/main/java/org/bouncycastle/openpgp/PGPSymmetricKeyEncryptedData.java"
        },
        "deprecated": false,
        "id": "CVE-2026-59640-213b76f2",
        "signature_type": "Line",
        "source": "https://github.com/bcgit/bc-java/commit/6b94b1c146cec1f565d9a85847fae511af77503e",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "270756521905740553887922822009730154934",
                "234388666347519758750509571604153776725",
                "186505597916280378535338349028662214152",
                "241771544909389106236817305913309577419",
                "13591022619069070617113074367045861918",
                "228108888634461591009170065151840663379"
            ]
        }
    },
    {
        "signature_version": "v1",
        "target": {
            "file": "pg/src/main/java/org/bouncycastle/openpgp/PGPSessionKeyEncryptedData.java"
        },
        "deprecated": false,
        "signature_type": "Line",
        "id": "CVE-2026-59640-3cdd526d",
        "source": "https://github.com/bcgit/bc-java/commit/6b94b1c146cec1f565d9a85847fae511af77503e",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "291997531259243721554778469529864575235",
                "125357033757300460215718238563511460534"
            ]
        }
    },
    {
        "signature_version": "v1",
        "target": {
            "function": "processSymmetricEncIntegrityPacketDataStream",
            "file": "pg/src/main/java/org/bouncycastle/openpgp/PGPEncryptedData.java"
        },
        "deprecated": false,
        "id": "CVE-2026-59640-45493e94",
        "signature_type": "Function",
        "digest": {
            "length": 875.0,
            "function_hash": "70742711808403761908924858800751936865"
        },
        "source": "https://github.com/bcgit/bc-java/commit/6b94b1c146cec1f565d9a85847fae511af77503e"
    },
    {
        "signature_version": "v1",
        "target": {
            "function": "getDataStream",
            "file": "pg/src/main/java/org/bouncycastle/openpgp/PGPSymmetricKeyEncryptedData.java"
        },
        "deprecated": false,
        "signature_type": "Function",
        "id": "CVE-2026-59640-87f421f1",
        "source": "https://github.com/bcgit/bc-java/commit/6b94b1c146cec1f565d9a85847fae511af77503e",
        "digest": {
            "length": 393.0,
            "function_hash": "83441929714388771371226748584049524064"
        }
    },
    {
        "signature_version": "v1",
        "target": {
            "file": "pg/src/test/java/org/bouncycastle/openpgp/test/PGPSessionKeyTest.java"
        },
        "deprecated": false,
        "id": "CVE-2026-59640-947d6bbe",
        "signature_type": "Line",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "222791434545271003907937225506870061428",
                "45585583239989964999744826137913605462",
                "129884966089975909637959526802652473732",
                "61283690759457485155136639222281420349",
                "183104424519333394051224003255451837299",
                "31930687478730054376312307805538298031",
                "103669351217101807287418918564995380837",
                "201039243211669276128169041085650540890"
            ]
        },
        "source": "https://github.com/bcgit/bc-java/commit/6b94b1c146cec1f565d9a85847fae511af77503e"
    },
    {
        "signature_version": "v1",
        "target": {
            "function": "getDataStream",
            "file": "pg/src/main/java/org/bouncycastle/openpgp/PGPPublicKeyEncryptedData.java"
        },
        "deprecated": false,
        "id": "CVE-2026-59640-f2137970",
        "signature_type": "Function",
        "digest": {
            "length": 1071.0,
            "function_hash": "67033837579540121131550698997503611142"
        },
        "source": "https://github.com/bcgit/bc-java/commit/6b94b1c146cec1f565d9a85847fae511af77503e"
    },
    {
        "signature_version": "v1",
        "target": {
            "file": "pg/src/main/java/org/bouncycastle/openpgp/PGPPublicKeyEncryptedData.java"
        },
        "deprecated": false,
        "id": "CVE-2026-59640-fdda4721",
        "signature_type": "Line",
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "305361709649942376249027324123947514264",
                "7792288907536211309222250240666824290",
                "105322056043517333653379010132210981475",
                "132139126631006945857346243928888669677",
                "286730860600336451126653747961348522337",
                "261238490834440320109408716932374928776",
                "98506360198953903387018901131207726344",
                "9588676783076511769144434898873774"
            ]
        },
        "source": "https://github.com/bcgit/bc-java/commit/6b94b1c146cec1f565d9a85847fae511af77503e"
    }
]
vanir_signatures_modified 
"2026-08-12T15:20:49Z"
source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-59640.json"