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MEDIUM severity

CVE-2020-29582 — kotlin-stdlib

MEDIUM

CVE-2020-29582 is a medium-severity (CVSS 5.3) Incorrect Default Permissions vulnerability in org.jetbrains.kotlin:kotlin-stdlib. A fix is available for org.jetbrains.kotlin:kotlin-stdlib — see the affected versions and patch details below.

Incorrect Default Permissions in JetBrains Kotlin

Also known asGHSA-cqj8-47ch-rvvq
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
2.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs86th percentile — riskier than 86% of all scored CVEsHighest risk
2.07%2.42%2.76%3.10%2.6%2.6%2.6%2.6%2.6%Jul 26Oct 26Nov 26

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

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
☕org.jetbrains.kotlin:kotlin-stdlib

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

Description

In JetBrains Kotlin before 1.4.21, a vulnerable Java API was used for temporary file and folder creation. An attacker was able to read data from such files and list directories due to insecure permissions.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.jetbrains.kotlin:kotlin-stdliball versions1.4.21org.jetbrains.kotlin:kotlin-stdlib:1.4.21

Affected Products

4 products · 4 configurations
Application
kotlinjetbrains
< 2.1.0
range
Application
communications cloud native core network slice selection functionoracle
1 version
1.2.1
Application
communications cloud native core policyoracle
1 version
1.14.0
Application
communications cloud native core service communication proxyoracle
1 version
1.14.0

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.jetbrains.kotlin:kotlin-stdlib, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.jetbrains.kotlin:kotlin-stdlib to 1.4.21 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2020-29582 is resolved across your whole dependency graph.

  3. Workarounds

    Close the privilege gap rather than the entry point: audit which accounts, roles and service identities can reach the affected operation, drop the component to the least privilege it actually needs, and review file and directory permissions created by earlier installs — a default left in place is what makes this reachable.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatLow

Red Hat CodeReady Studio 12 is not affected by this vulnerability because It ships kotlin-stdlib. The vulnerable component is not in kotlin-stdlib.

ProductFixed inAdvisory
Red Hat Fuse 7.11kotlin-scripting-jvmRHSA-2022:5532
Red Hat Integrationkotlin-scripting-jvmRHSA-2021:3205
Red Hat Integration Camel Quarkus 2see advisoryRHSA-2021:3207

Frequently Asked Questions

In JetBrains Kotlin before 1.4.21, a vulnerable Java API was used for temporary file and folder creation. An attacker was able to read data from such files and list directories due to insecure permissions.
O3 Security · Impact-Aware SCA

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CVE-2020-29582: kotlin-stdlib — Fixed in 1.4.21