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Not in CISA KEV
LOW severity

CVE-2025-66372 — library

LOWFix: ZUGFeRD/mustangproject#725

CVE-2025-66372 is a low-severity (CVSS 2.8) XML External Entity (XXE) vulnerability in org.mustangproject:library. A fix is available for org.mustangproject:library — see the affected versions and patch details below.

Mustangproject allows exfiltrating files via XXE attacks

Also known asGHSA-x832-fpvj-r5ph
Published
Updated
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Nov 7, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2025-66372.

EPSS Exploitation Probability

via FIRST.org ↗
0.1%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs3th percentile — riskier than 3% of all scored CVEsHighest risk
0.00%0.21%0.42%0.63%0.0%0.1%May 26Sep 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

2 pkgs affected
☕org.mustangproject:library☕org.mustangproject:validator

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

Mustang before 2.16.3 allows exfiltrating files via XXE attacks.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.mustangproject:libraryall versions2.16.3org.mustangproject:library:2.16.3
☕Mavenorg.mustangproject:validatorall versions2.16.3org.mustangproject:validator:2.16.3

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

  2. Fix

    Update org.mustangproject:library to 2.16.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-66372 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

Mustang before 2.16.3 allows exfiltrating files via XXE attacks.
O3 Security · Impact-Aware SCA

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CVE-2025-66372: library XXE — Fixed in 2.16.3