CVE-2026-45384
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 · uneditedbit7z is a cross-platform C++ static library that allows the compression/extraction of archive files. Prior to version 4.0.12, there is an arbitrary file overwrite vulnerability via symlink attack on predictable temp files during archive update. This issue has been patched in version 4.0.12.
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 confidencebit7z versions prior to 4.0.12 contain an arbitrary file overwrite vulnerability exploited via symlink attacks on predictable temporary files during archive update operations. Attackers can manipulate the predictable temp file names to redirect writes to arbitrary filesystem locations, leading to potential system compromise.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
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
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- Low
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L
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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Identify bit7z installation and versionRun 'bit7z --version' or check the application's 'About' dialog, or inspect the installed binary/library file version metadataAffected if The installed version is lower than 4.0.12 or cannot be determined to be 4.0.12 or higher
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Confirm archive update operations are performedReview application logs or usage patterns to determine if archive update functionality (adding/updating files in existing archives) is usedAffected if Archive update operations are performed using bit7z versions below 4.0.12
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Verify temp directory permissionsCheck the directory where bit7z creates temporary files during archive operations (commonly the system temp folder such as /tmp or %TEMP%) for any suspicious symlinks pointing to sensitive filesAffected if Any symlink files exist in the temp directory with names that match bit7z temporary file patterns (if observable)
A system is affected if bit7z version 4.0.12 or higher is not installed and archive update operations are performed, as the vulnerable code path for predictable temp file creation is triggered during those operations.
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.
dbcve · scopedUpgrade to bit7z version 4.0.12 or later which patches the insecure temp file handling. If upgrading is not immediately feasible, avoid using archive update functionality in untrusted environments.
version 4.0.12
- 1. Identify the current version of bit7z being used in your project by checking your build configuration, dependency manager, or source code
- 2. If using a package manager (e.g., vcpkg, conan, or a git submodule), update to version 4.0.12 or later
- 3. If using git submodule, navigate to the bit7z repository directory and run: git fetch origin && git checkout <tag> where <tag> is v4.0.12 or a later release
- 4. Rebuild your project to incorporate the updated library
- 5. Verify the new version is 4.0.12 or later by checking the library version at runtime or in build logs
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation3.0 h
- Testing2.0 h
- Review / QA1.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $2,272.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-45384 — 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-2026-45384 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
- No weaponised exploit code, or anything meant to cause harm
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