How severe is GHSA-f5cx-h789-j959?

No CVSS score has been assigned to GHSA-f5cx-h789-j959 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-f5cx-h789-j959?

GHSA-f5cx-h789-j959 affects the following packages: com.powsybl:powsybl-math (Maven). Ecosystems affected: Maven.

How do I fix GHSA-f5cx-h789-j959?

Update com.powsybl:powsybl-math to 6.7.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-f5cx-h789-j959 is resolved across your whole dependency graph.

How do I detect GHSA-f5cx-h789-j959 in my Maven dependencies?

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

How do I mitigate GHSA-f5cx-h789-j959 if there is no patch (or I can't update yet)?

Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Is GHSA-f5cx-h789-j959 actively exploited in the wild?

No public exploit code has been indexed for GHSA-f5cx-h789-j959 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-f5cx-h789-j959?

GHSA-f5cx-h789-j959 has an EPSS (Exploit Prediction Scoring System) score of 0.5%, placing it in the 44th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-f5cx-h789-j959?

GHSA-f5cx-h789-j959 is classified as Deserialization of Untrusted Data (CWE-502). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was GHSA-f5cx-h789-j959 published, and has it been updated?

GHSA-f5cx-h789-j959 was published on June 19, 2025 and was last updated on June 20, 2025. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕ Maven

Not in CISA KEV

PowSyBl Core allows deserialization of untrusted SparseMatrix dataGHSA-f5cx-h789-j959

Fix: powsybl/powsybl-core@8ed16ce

GHSA-f5cx-h789-j959 is a Deserialization of Untrusted Data vulnerability in com.powsybl:powsybl-math. A fix is available for com.powsybl:powsybl-math — see the affected versions and patch details below.

Also known asCVE-2025-47771

Published

Jun 19, 2025

Updated

Jun 20, 2025

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
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 GHSA-f5cx-h789-j959.

EPSS Exploitation Probability

via FIRST.org ↗

0.5%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs44th percentile — riskier than 44% of all scored CVEsHighest risk

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

Real-World Exposure

1 pkg affected

☕com.powsybl:powsybl-math

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

Impact

What kind of vulnerability is it? Who is impacted?

This is a disclosure for a security vulnerability in the SparseMatrix class. The vulnerability is a deserialization issue that can lead to a wide range of privilege escalations depending on the circumstances. The problematic area is the read method of the SparseMatrix class. This method takes in an InputStream and returns a SparseMatrix object. We consider this to be a method that can be exposed to untrusted input in at least two use cases:

A user can adopt this method in an application where users can submit an InputStream and the application parses it into a SparseMatrix. This can be a multi-tenant application that hosts many different users perhaps with different privilege levels.
A user adopts the method for a local tool but receives the InputStream from external sources.

Am I impacted?

You are vulnerable if you import non-controlled serialized SparseMatrix objects.

Patches

com.powsybl:powsybl-math:6.7.2 and higher

Workarounds

Is there a way for users to fix or remediate the vulnerability without upgrading?

Do not use SparseMatrix deserialization (SparseMatrix.read(...) methods).

References

powsybl-core v6.7.2

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`com.powsybl:powsybl-math`	≥ 6.3.0&&< 6.7.2	6.7.2`com.powsybl:powsybl-math:6.7.2`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for com.powsybl:powsybl-math, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update com.powsybl:powsybl-math to 6.7.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-f5cx-h789-j959 is resolved across your whole dependency graph.
Workarounds
Do not deserialise data from untrusted sources: where the format allows it, restrict deserialisation to an explicit allowlist of expected types, and prefer a data-only format (JSON, Protobuf) over one that can reconstruct arbitrary objects until you can upgrade.

Frequently Asked Questions

### Impact _What kind of vulnerability is it? Who is impacted?_ This is a disclosure for a security vulnerability in the `SparseMatrix` class. The vulnerability is a deserialization issue that can lead to a wide range of privilege escalations depending on the circumstances. The problematic area is the `read` method of the `SparseMatrix` class. This method takes in an `InputStream` and returns a `SparseMatrix` object. We consider this to be a method that can be exposed to untrusted input in at least two use cases: - A user can adopt this method in an application where users can submit an `Inpu

O3 Security · Impact-Aware SCA

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