dbcve.org
Ark LibraryApplication · Bandisoft

CVE-2021-26635

HIGH · 7.8 CVSS v3.1 Published 2022-06-02
Fix available
A fix is available. Upgrade to 7.17 or later.
See remediation →
81/100
Remediation priority · High
No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
In the code that verifies the file size in the ark library, it is possible to manipulate the offset read from the target file due to the wrong use of the data type. An attacker could use this vulnerability to cause a stack buffer overflow and as a result, perform an attack such as remote code execution.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

A data type mismatch in the ark library's file size verification code allows manipulation of the offset value read from target files, leading to a stack buffer overflow that could enable remote code execution.

MitigationUpdate the ark library to a patched version that corrects the data type handling in the file offset verification logic, or if no patch exists, implement proper bounds checking and type-safe offset handling in the affected code paths.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Ark LibraryApplication
Affected:< 7.17

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
None
User interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify Bandisoft Ark Library installation
    Search for ark library files (ark.dll, bandiark.dll, or similar ark-related DLLs) in the system. Check common installation directories like Program Files, or search using 'where ark.dll' or 'Get-ChildItem -Recurse ark.dll' in PowerShell.
    Affected if The ark library DLL is present on the system.
  2. Determine ark library version
    Right-click the ark DLL file, select Properties, then check the File Version tab. Alternatively, use a tool like 'exiftool' or examine the VERSIONINFO resource embedded in the DLL.
    Affected if The installed version number is lower than 7.17 (for example, 7.16, 7.15, etc.).
  3. Verify file processing usage
    Identify applications or services that use the ark library for file parsing. Check application logs, dependencies, or examine which executables load the ark DLL using 'tasklist /m ark.dll' or 'Get-Process | Where-Object { $_.Modules -like '*ark*' }'.
    Affected if Applications or services actively load and use the ark library to process files.
  4. Assess file processing context
    Determine whether the ark library processes files from untrusted or external sources, as the vulnerability allows manipulation of offset values in target files.
    Affected if The library processes files from sources outside the trusted local environment.

The environment is affected if Bandisoft Ark Library version 7.17 or higher is NOT installed AND the library is used to process files, particularly from untrusted sources.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 7.17 or later
Fixed in 7.17
Interim mitigation

Update the ark library to a patched version that corrects the data type handling in the file offset verification logic, or if no patch exists, implement proper bounds checking and type-safe offset handling in the affected code paths.

Recommended fix Moderate confidence

Ark Library version 7.17

  1. 1. Identify all systems and applications that use the Ark Library
  2. 2. Check the current installed version of Ark Library using package manager or application dependencies
  3. 3. Backup all critical data and configurations before upgrading
  4. 4. Upgrade Ark Library to version 7.17 or later using the appropriate package manager (e.g., pip, npm, or system package manager depending on how it was installed)
  5. 5. Verify the upgrade was successful by checking the installed version
  6. 6. Restart any services or applications that depend on Ark Library
  7. 7. Test that affected functionality works correctly after the upgrade
Caveat No specific breaking changes documented in the provided vulnerability information

Generated from the published advisory — verify against the referenced sources before acting.

Fix this in Ark Library Scoped from the published advisory
  • Consultation4.0 h
  • Implementation8.0 h
  • Testing6.0 h
  • Review / QA3.0 h
21.0 hours of engineering $3,680
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2021-26635 in production — separate from our analysis above.

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What this is

A place for practitioners to share what actually worked: a mitigation you’ve tested, a configuration change, a version- or environment-specific caveat, or a link to a verified patch. The most useful notes rise to the top as peers upvote them, so the signal stays high.

What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
  • No weaponised exploit code, or anything meant to cause harm
  • No spam, self-promotion, credentials, or personal data