CVE-2026-39853

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Source
https://cve.org/CVERecord?id=CVE-2026-39853
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39853.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-39853
Aliases
  • GHSA-hx87-8754-xvh4
Downstream
Published
2026-04-09T15:50:26Z
Modified
2026-10-28T10:49:40Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
Summary
osslsigncode has a Stack Buffer Overflow via Unbounded Digest Copy During Signature Verification
Details

osslsigncode is a tool that implements Authenticode signing and timestamping. Prior to 2.12, A stack buffer overflow vulnerability exists in osslsigncode in several signature verification paths. During verification of a PKCS#7 signature, the code copies the digest value from a parsed SpcIndirectDataContent structure into a fixed-size stack buffer (mdbuf[EVP_MAX_MD_SIZE], 64 bytes) without validating that the source length fits within the destination buffer. This pattern is present in the verification handlers for PE, MSI, CAB, and script files. An attacker can craft a malicious signed file with an oversized digest field in SpcIndirectDataContent. When a user verifies such a file with osslsigncode verify, the unbounded memcpy can overflow the stack buffer and corrupt adjacent stack state. This vulnerability is fixed in 2.12.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-121",
        "CWE-787"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/39xxx/CVE-2026-39853.json"
}
References

Affected packages

Git / github.com/mtrojnar/osslsigncode

Affected ranges

Type
GIT
Repo
https://github.com/mtrojnar/osslsigncode
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
fac81646228a4d58aa9df41ac2b84c5a21d9d2d9
Fixed
cbee1e723c5a8547302bd841ad9943ed8144db68
Database specific
Show details 
{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:osslsigncode_project:osslsigncode:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "2.12"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "range":  [
                {
                    "fixed":  "cbee1e723c5a8547302bd841ad9943ed8144db68"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "2.12",
            "range":  [
                {
                    "fixed":  "fac81646228a4d58aa9df41ac2b84c5a21d9d2d9"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

2.*
2.0
2.1
2.10
2.11
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-39853.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "7082838060947355442102594181268479517",
            "length":  3442
        },
        "id":  "CVE-2026-39853-1c46e99e",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68",
        "target":  {
            "file":  "msi.c",
            "function":  "msi_verify_digests"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "135713086926393218447926872216326261372",
                "199914932917842896028731767519076129123"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-39853-245900bc",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68",
        "target":  {
            "file":  "helpers.h"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "68415973127219734331714277347035975712",
                "325540716297678602498258335186037007802",
                "140759284760969063668494452973539589512",
                "337882276697824980006384321900902187802",
                "115427071862798010042693710436358850595",
                "67522959823450650990004599689480862185"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-39853-25e54eff",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68",
        "target":  {
            "file":  "cat.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "330075126843529403136055493081121401",
            "length":  840
        },
        "id":  "CVE-2026-39853-496a7c8c",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68",
        "target":  {
            "file":  "cat.c",
            "function":  "cat_print_content_member_digest"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "294196164287761961589666703434750257173",
                "60495124532956490106045270096232172204",
                "151216767925243767661756542210958922717",
                "337882276697824980006384321900902187802",
                "115427071862798010042693710436358850595",
                "165970862720636573206245504323385944522"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-39853-4c28ce3e",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68",
        "target":  {
            "file":  "msi.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "98387009644364892356896584865388264656",
            "length":  1556
        },
        "id":  "CVE-2026-39853-63fe31a9",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68",
        "target":  {
            "file":  "pe.c",
            "function":  "pe_verify_digests"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "177243898153687793868340892984033007942",
                "188228084852164090110183459134525021076",
                "222957626769235363520763389406175655106",
                "337882276697824980006384321900902187802",
                "211883438698217851110911666084850698172",
                "209386534667382533773141099439571757428"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-39853-7edc3891",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68",
        "target":  {
            "file":  "osslsigncode.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "317210793094659141246130368244393693107",
            "length":  1118
        },
        "id":  "CVE-2026-39853-95e8b7e0",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68",
        "target":  {
            "file":  "cab.c",
            "function":  "cab_verify_digests"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "36272731860730000053498603403996601283",
                "85397026836763774827995722626512084907",
                "272474611131647023760888946609624306382"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-39853-ace119bd",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68",
        "target":  {
            "file":  "helpers.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "294196164287761961589666703434750257173",
                "60495124532956490106045270096232172204",
                "151216767925243767661756542210958922717",
                "337882276697824980006384321900902187802",
                "115427071862798010042693710436358850595",
                "165970862720636573206245504323385944522"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-39853-d31659a0",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68",
        "target":  {
            "file":  "script.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "297053246920564782174884000374205904393",
            "length":  1193
        },
        "id":  "CVE-2026-39853-e2a27dba",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68",
        "target":  {
            "file":  "script.c",
            "function":  "script_verify_digests"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "162772363341062063893543784638959021372",
            "length":  1717
        },
        "id":  "CVE-2026-39853-e5f53135",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68",
        "target":  {
            "file":  "osslsigncode.c",
            "function":  "verify_content_member_digest"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "294196164287761961589666703434750257173",
                "60495124532956490106045270096232172204",
                "151216767925243767661756542210958922717",
                "337882276697824980006384321900902187802",
                "115427071862798010042693710436358850595",
                "165970862720636573206245504323385944522"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-39853-eb077b2a",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68",
        "target":  {
            "file":  "cab.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "213052994559488522703551477998432787905",
                "144174570826663442529232161926665724338",
                "222957626769235363520763389406175655106",
                "337882276697824980006384321900902187802",
                "115427071862798010042693710436358850595",
                "165970862720636573206245504323385944522"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-39853-efe8cca2",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68",
        "target":  {
            "file":  "pe.c"
        }
    }
]
vanir_signatures_modified 
"2026-10-28T10:49:40Z"