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HIGH severity

CVE-2020-7664 — cae

HIGHFix: unknwon/cae@07971c0

CVE-2020-7664 is a high-severity (CVSS 7.5) Path Traversal vulnerability in github.com/unknwon/cae. 1 public exploit reference exists, so weaponization risk is real. A fix is available for github.com/unknwon/cae — see the affected versions and patch details below.

Path Traversal in github.com/unknwon/cae/zip

Also known asGO-2021-0228
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
1 known
Exploitation data as of Oct 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs72th percentile — riskier than 72% of all scored CVEsHighest risk
0.00%0.64%1.28%1.92%0.3%1.4%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2020-7664 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected
🐹github.com/unknwon/cae

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

The ExtractTo function doesn't securely escape file paths in zip archives which include leading or non-leading "..". This allows an attacker to add or replace files system-wide.

Specific Go Packages Affected

github.com/unknwon/cae/zip

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/unknwon/caeall versions1.0.1go get github.com/unknwon/cae@v1.0.1

Affected Products

1 product · 1 configurations
Application
compression and archive extensions zip projectcompression_and_archive_extensions_project
all
Exploits & PoCs
1

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

In all versions of the package github.com/unknwon/cae/zip, the ExtractTo…

snyk.ioNVDJul 2021

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/unknwon/cae, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/unknwon/cae to 1.0.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-7664 is resolved across your whole dependency graph.

  3. Workarounds

    Resolve every user-supplied path to its canonical form and reject anything that escapes the intended directory, and run the component under an account that has no read or write access outside the directory it legitimately serves.

Frequently Asked Questions

The ExtractTo function doesn't securely escape file paths in zip archives which include leading or non-leading "..". This allows an attacker to add or replace files system-wide. ### Specific Go Packages Affected github.com/unknwon/cae/zip
O3 Security · Impact-Aware SCA

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Find it across Go, including transitive dependencies.

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CVE-2020-7664: cae — Fixed in 1.0.1