CVE-2016-1000338

In Bouncy Castle JCE Provider version 1.55 and earlier the DSA does not fully validate ASN.1 encoding of signature on verification. It is possible to inject extra elements in the sequence making up the signature and still have it validate, which in some cases may allow the introduction of 'invisible' data into a signed structure.

References

Affected packages

Git / github.com/bcgit/bc-java

Affected ranges

Type

GIT

Repo

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

Events

Introduced

Fixed

996763c72e128cd677fcd97d3fa74beb2c12124b

Fixed

b0c3ce99d43d73a096268831d0d120ffc89eac7f

Database specific

{
    "versions": [
        {
            "introduced": "1.38"
        },
        {
            "fixed": "1.56"
        }
    ]
}

Affected versions

Other

r1rv49

r1rv50

r1rv51

r1rv52

r1rv53

r1rv54

r1rv55

Database specific

unresolved_ranges

[
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "6.4-NA"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "6.4"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "14.04"
            }
        ]
    }
]

vanir_signatures_modified

"2026-04-10T04:57:23Z"

vanir_signatures

[
    {
        "digest": {
            "function_hash": "260934301005839087771033825261480613861",
            "length": 2322.0
        },
        "signature_type": "Function",
        "id": "CVE-2016-1000338-087c7fa8",
        "signature_version": "v1",
        "source": "https://github.com/bcgit/bc-java/commit/b0c3ce99d43d73a096268831d0d120ffc89eac7f",
        "deprecated": false,
        "target": {
            "file": "prov/src/test/java/org/bouncycastle/jce/provider/test/DSATest.java",
            "function": "performTest"
        }
    },
    {
        "digest": {
            "line_hashes": [
                "136163138208565596251691075970191609612",
                "107562756255838380340501290306204437774",
                "256405273294590351025306411110688622024",
                "321391742634389090900092687248037489853",
                "6668448620659695156447218389951777055",
                "114414081459311079942728053419609401083",
                "224667266301163910456003187272837519895",
                "332764780958810242807759347728695018005",
                "2754744943816587054499795256365031272",
                "54339207175021658509884097720332228201",
                "260804928531546614162744774821933798241",
                "78059865186365016316398972156821482959",
                "197034695221731228794406326079488881854"
            ],
            "threshold": 0.9
        },
        "signature_type": "Line",
        "id": "CVE-2016-1000338-7c04278f",
        "signature_version": "v1",
        "source": "https://github.com/bcgit/bc-java/commit/b0c3ce99d43d73a096268831d0d120ffc89eac7f",
        "deprecated": false,
        "target": {
            "file": "prov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/dsa/DSASigner.java"
        }
    },
    {
        "digest": {
            "function_hash": "62843566931630879095861907111734894785",
            "length": 237.0
        },
        "signature_type": "Function",
        "id": "CVE-2016-1000338-9c489c5a",
        "signature_version": "v1",
        "source": "https://github.com/bcgit/bc-java/commit/b0c3ce99d43d73a096268831d0d120ffc89eac7f",
        "deprecated": false,
        "target": {
            "file": "prov/src/main/java/org/bouncycastle/jcajce/provider/asymmetric/dsa/DSASigner.java",
            "function": "derDecode"
        }
    },
    {
        "digest": {
            "line_hashes": [
                "27619101407773283894022340957986395790",
                "53925406762360604861398560861262849999",
                "216990679076247254168542336595971957581",
                "14297879978164554187003311429379829455",
                "11867573160650489211141619707597149843",
                "207007376803811096500197258371319649111",
                "312819499243767890488137211355596467932"
            ],
            "threshold": 0.9
        },
        "signature_type": "Line",
        "id": "CVE-2016-1000338-d475fda9",
        "signature_version": "v1",
        "source": "https://github.com/bcgit/bc-java/commit/b0c3ce99d43d73a096268831d0d120ffc89eac7f",
        "deprecated": false,
        "target": {
            "file": "prov/src/test/java/org/bouncycastle/jce/provider/test/DSATest.java"
        }
    }
]

source

"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2016-1000338.json"