How severe is CVE-2026-9673?

No CVSS score has been assigned to CVE-2026-9673 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-9673?

CVE-2026-9673 affects the following packages: json-2-csv (npm). Ecosystems affected: npm.

How do I fix CVE-2026-9673?

Update json-2-csv to 5.5.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-9673 is resolved across your whole dependency graph.

How do I detect CVE-2026-9673 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for json-2-csv, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-9673 if there is no patch (or I can't update yet)?

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.

Is CVE-2026-9673 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-9673 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 CVE-2026-9673?

CVE-2026-9673 has an EPSS (Exploit Prediction Scoring System) score of 0.2%, placing it in the 13th 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 CVE-2026-9673?

CVE-2026-9673 is classified as CWE-1236 (CWE-1236). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2026-9673 published, and has it been updated?

CVE-2026-9673 was published on May 28, 2026 and was last updated on September 1, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

📦 npm

Not in CISA KEV

CVE-2026-9673 — json-2-csv

Fix: mrodrig/json-2-csv@0fdd0bb

CVE-2026-9673 is a CWE-1236 vulnerability in json-2-csv. A fix is available for json-2-csv — see the affected versions and patch details below.

json-2-csv vulnerable to CSV Injection via the preventCsvInjection optio

Also known asGHSA-g27c-q7cp-mhx6

Published

May 28, 2026

Updated

Sep 1, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Oct 8, 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-2026-9673.

EPSS Exploitation Probability

via FIRST.org ↗

0.2%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs13th percentile — riskier than 13% of all scored CVEsHighest risk

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

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

302other npm packages depend on this — each one inherits the vulnerability until it's patched upstream

json-2-csvnpm

1.6Mdownloads / week

Description

Versions of the package json-2-csv from 3.15.0 and before 5.5.11 are vulnerable to CSV Injection via the preventCsvInjection option which can be bypassed. An attacker can inject formulas into CSV files, which execute when the files are opened in spreadsheet applications.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`json-2-csv`	≥ 3.15.0&&< 5.5.11	5.5.11`npm install json-2-csv@5.5.11`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for json-2-csv, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update json-2-csv to 5.5.11 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-9673 is resolved across your whole dependency graph.
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.

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 HatModerate

This Moderate vulnerability in `json-2-csv` allows for CSV Injection due to a bypass in the `preventCsvInjection` option. While exploitation requires a user to open a specially crafted CSV file in a spreadsheet application, successful attacks could lead to arbitrary code execution or information disclosure. This…

Workaround published by Red Hat

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Source: Red Hat security advisory for CVE-2026-9673 (CC BY 4.0)

Product	Fixed in	Advisory
Red Hat Developer Hub 1.10	`rhdh/rhdh-hub-rhel9:1783448184`	RHSA-2026:36754
Red Hat Developer Hub 1.9	`rhdh/rhdh-hub-rhel9:1782761244`	RHSA-2026:33574

Frequently Asked Questions

O3 Security · Impact-Aware SCA

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