CVE-2025-7998
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 · uneditedAshlar-Vellum Cobalt CO File Parsing Out-Of-Bounds Write Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Ashlar-Vellum Cobalt. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of CO files. The issue results from the lack of proper validation of user-supplied data, which can result in a write past the end of an allocated data structure. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-26046.
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 · high confidenceThis is an out-of-bounds write vulnerability in Ashlar-Vellum Cobalt's CO file parser. The parser fails to validate user-supplied data properly before writing to memory, allowing an attacker to write past the end of an allocated buffer. This can be triggered by convincing a user to open a malicious CO file, leading to arbitrary code execution in the context of the current process.
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 dataall versionsCVSS 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:3.0/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 checksWork through these to decide whether this CVE applies to you.
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Confirm Ashlar Cobalt installationSearch for 'Cobalt' or 'Ashlar' in installed programs or look for cobalt.exe in common installation directories such as C:\Program Files\Ashlar or C:\Program Files (x86)\AshlarAffected if Ashlar Cobalt is found installed on the system
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Identify CO file handler availabilityCheck if the CO file type (.co) is associated with Cobalt by looking at file associations in the Windows registry under HKEY_CLASSES_ROOT\.co or by attempting to open a CO file with CobaltAffected if CO files can be opened by Cobalt, indicating the parser is active
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Locate CO files in the environmentSearch for .co files on the system using file explorer search or command: dir /s /b *.coAffected if CO files exist on the system, particularly in locations accessible to untrusted users or downloaded from external sources
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Check for recent CO file importsReview Cobalt's recent files list, temp directories, or download folders for recently opened CO filesAffected if A user has recently opened a CO file from an untrusted or unknown source
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Verify sandboxing or restricted executionInspect whether Cobalt is running in a sandboxed environment, virtualized container, or with restricted privileges that would limit code execution impactAffected if Cobalt runs without sandboxing or additional process restrictions and processes CO files from potentially untrusted sources
A user is affected if Ashlar Cobalt is installed and can open CO files from untrusted or unknown sources without sandbox protections.
Generated from the published advisory. Verify against your own configuration.
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.
From vendor dataAvoid opening untrusted CO files from unknown sources. Apply vendor patches when available. Consider running Cobalt in sandboxed or restricted environments to limit impact if exploitation occurs.
- Consultation3.0 h
- Implementation6.0 h
- Testing6.0 h
- Review / QA3.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-7998 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-7998 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
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