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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteZip Slip is a path traversal flaw in archive extraction: a crafted archive can name a file such as ../../outside.txt, and an unsafe extractor may write it outside the folder intended for extraction. The immediate result is an unintended file creation or overwrite. Code execution is possible if the overwritten file is later run or loaded, but it is not automatic.
How Zip Slip lets an archive escape its destination
An extractor typically takes a destination directory and an archive member name, combines them into a path, and writes the file. The member name is untrusted input. If the extractor does not resolve the resulting path and confirm that it remains beneath the intended destination, traversal components such as .. can point somewhere else. Snyk illustrates the flaw with vulnerable Java code that constructs a file from the destination and entry name, then writes without checking containment. Snyk’s Zip Slip research
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For example, an archive entry named ../../outside.txt can be interpreted as “move up two directories, then write outside.txt.” The precise destination depends on the extraction root and platform path handling. The core error is not that ZIP files can inherently write anywhere; it is that extraction code trusts an archive-supplied path without enforcing the intended boundary.
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Two conditions are necessary: an attacker-controlled archive must reach an extraction operation, and the code performing extraction must fail to constrain each member path to the extraction root. Receiving, storing, or scanning an archive alone does not establish that an application is vulnerable.
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- Immediate impact: an archive may create or replace files outside the target folder.
- Possible escalation: if the affected file is executable or configuration that a process later runs or loads, the overwrite may enable code execution. That outcome depends on the target and what uses it; extraction does not guarantee it.
- Other consequences: unintended writes can damage system configuration or sensitive data. The affected extractor may run on a server or a user’s device.
Snyk publicly disclosed Zip Slip on June 5, 2018. Its disclosure describes the issue across multiple archive formats and implementations, including tar, jar, war, cpio, apk, rar, and 7z, as well as ZIP. That is evidence of the pattern’s historical breadth, not a current audit of every format, library, or version. Disclosure and technical overview
How to prevent Zip Slip in extraction code
- Resolve, then check containment. Resolve every member path against the intended extraction root and reject it if the resolved location is outside that root. Do not rely on string concatenation or a superficial check for the text
..; account for absolute paths and platform-specific separators. MITRE classifies the underlying weakness as improper limitation of a pathname to a restricted directory. MITRE CWE-22 - Use an appropriate maintained API. Check the exact extraction API and runtime or library version, including its documented path-handling behavior. The presence of an “extract” helper does not by itself prove that it safely validates paths.
- Review links and filesystem behavior. Consider how the operating system resolves links as well as ordinary relative paths. A containment check must reflect the paths the filesystem will actually follow.
- Limit extraction privileges. Run extraction with only the filesystem permissions it needs, and consider isolation where the threat warrants it. Sandboxing can reduce the scope of a successful write, but its protection depends on the boundary provided and may limit impact rather than eliminate the flaw. MITRE CWE-22 mitigation guidance
- Review application code and dependencies. Check both the extractor implementation and the exact deployed dependency versions. Application code can reproduce the unsafe path-joining pattern even when a particular library vulnerability is not present.
Python: extract() and zipfile.Path are different
Python 3.14.8 documentation says ZipFile.extract() and extractall() attempt to prevent traversal by stripping absolute path prefixes and removing .. components. The documentation still cautions against extracting untrusted archives without prior inspection. Python 3.14.8 zipfile documentation
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The separate zipfile.Path interface does not sanitize member names. If using it, the caller is responsible for validation; the documentation suggests resolving paths and checking them against the intended root. Do not transfer the safety behavior documented for extract() or extractall() to a different API.
Snyk’s 2018 analysis reported Python’s standard zipfile extraction as not vulnerable in its assessment and described a then-vulnerable tarfile case. Those historical findings do not establish the status of every current Python runtime, API, or application. Verify the runtime version and the specific extraction path your code uses. Snyk’s Zip Slip vulnerability repository
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What to verify when reviewing an extractor
- Does it validate the resolved destination for every archive member, not just the member’s text?
- How does it handle absolute paths, traversal segments, platform-specific separators, and links?
- Which exact runtime, library, and version are deployed, and what do their current vendor advisories say?
- What filesystem permissions and isolation boundaries apply while extraction runs?
Historical package vulnerability lists are not a substitute for checking the component and version actually deployed. Snyk’s repository records fixes associated with the 2018 disclosures; it does not establish current package status for an arbitrary application.
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