Vulnerability-Lookup

CVE-2026-39853 (GCVE-0-2026-39853)

Vulnerability from cvelistv5 – Published: 2026-04-09 15:50 – Updated: 2026-04-09 16:15

Title

osslsigncode has a Stack Buffer Overflow via Unbounded Digest Copy During Signature Verification

Summary

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.

Severity ?

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE

CWE-121 - Stack-based Buffer Overflow
CWE-787 - Out-of-bounds Write

Assigner

GitHub_M

References

URL

Tags

	https://github.com/mtrojnar/osslsigncode/security…	x_refsource_CONFIRM
	https://github.com/mtrojnar/osslsigncode/commit/c…	x_refsource_MISC
	https://github.com/mtrojnar/osslsigncode/releases…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	mtrojnar	osslsigncode	Affected: < 2.12

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-39853

Vulnerability from fkie_nvd - Published: 2026-04-09 16:16 - Updated: 2026-04-13 15:02

Severity ?

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/mtrojnar/osslsigncode/commit/cbee1e723c5a8547302bd841ad9943ed8144db68
	security-advisories@github.com	https://github.com/mtrojnar/osslsigncode/releases/tag/2.12
	security-advisories@github.com	https://github.com/mtrojnar/osslsigncode/security/advisories/GHSA-hx87-8754-xvh4

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-39853",
  "lastModified": "2026-04-13T15:02:47.353",
  "metrics": {
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          "attackComplexity": "LOW",
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    },
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      "url": "https://github.com/mtrojnar/osslsigncode/releases/tag/2.12"
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}

MSRC_CVE-2026-39853

Vulnerability from csaf_microsoft - Published: 2026-04-02 00:00 - Updated: 2026-04-13 14:40

Summary

osslsigncode has a Stack Buffer Overflow via Unbounded Digest Copy During Signature Verification

Notes

Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle

Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

CVE-2026-39853

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-121 - Stack-based Buffer Overflow

None Available There is no fix available for this vulnerability as of now

References

URL

Category

	https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self
	https://support.microsoft.com/lifecycle	external
	https://www.first.org/cvss	external
	https://msrc.microsoft.com/csaf/vex/2026/msrc_cve…	self

JSON

To clipboard

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                  "product_id": "17086"
                }
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            "category": "product_name",
            "name": "Azure Linux"
          },
          {
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                "category": "product_version_range",
                "name": "cbl2 osslsigncode 2.7-1",
                "product": {
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          "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-39853.json"
        }
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      "remediations": [
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          "date": "2026-04-12T01:02:14.000Z",
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}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-39853 (GCVE-0-2026-39853)

FKIE_CVE-2026-39853

MSRC_CVE-2026-39853

Tags

Sightings

Nomenclature