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MEDIUM severity

CVE-2021-36374 — ant

MEDIUM

CVE-2021-36374 is a medium-severity (CVSS 5.5) CWE-130 vulnerability in org.apache.ant:ant. A fix is available for org.apache.ant:ant — see the affected versions and patch details below.

Improper Handling of Length Parameter Inconsistency in Apache Ant

Also known asGHSA-5v34-g2px-j4fw
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Oct 9, 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 CVEs85th percentile — riskier than 85% of all scored CVEsHighest risk
0.00%1.13%2.27%3.40%0.1%2.6%Apr 26Aug 26Oct 26

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

How urgent is this, really

CVE-2021-36374 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 385,738 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

2 pkgs affected
☕org.apache.ant:ant☕org.apache.ant:ant

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

When reading a specially crafted ZIP archive, or a derived formats, an Apache Ant build can be made to allocate large amounts of memory that leads to an out of memory error, even for small inputs. This can be used to disrupt builds using Apache Ant. Commonly used derived formats from ZIP archives are for instance JAR files and many office files. Apache Ant prior to 1.9.16 and 1.10.11 were affected.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.apache.ant:ant≥ 1.9.0&&< 1.9.161.9.16org.apache.ant:ant:1.9.16
☕Mavenorg.apache.ant:ant≥ 1.10.0&&< 1.10.111.10.11org.apache.ant:ant:1.10.11

Affected Products

36 products · 79 configurations
Application
antapache
≥ 1.10.0 && < 1.10.11
range
Application
agile engineering data managementoracle
1 version
6.2.1.0
Application
agile product lifecycle managementoracle
1 version
9.3.6
Application
banking trade financeoracle
1 version
14.5
Application
banking treasury managementoracle
1 version
14.5
Application
communications cloud native core automated test suiteoracle
1 version
1.9.0

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.apache.ant:ant, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.apache.ant:ant to 1.9.16 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2021-36374 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

When reading a specially crafted ZIP archive, or a derived formats, an Apache Ant build can be made to allocate large amounts of memory that leads to an out of memory error, even for small inputs. This can be used to disrupt builds using Apache Ant. Commonly used derived formats from ZIP archives are for instance JAR files and many office files. Apache Ant prior to 1.9.16 and 1.10.11 were affected.
O3 Security · Impact-Aware SCA

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CVE-2021-36374: ant — Fixed in 1.9.16