How severe is CVE-2025-5891?

No CVSS score has been assigned to CVE-2025-5891 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2025-5891?

CVE-2025-5891 affects the following packages: pm2 (npm). Ecosystems affected: npm.

How do I fix CVE-2025-5891?

Update pm2 to 7.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-5891 is resolved across your whole dependency graph.

How do I detect CVE-2025-5891 in my npm dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for pm2, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2025-5891 if there is no patch (or I can't update yet)?

Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Is CVE-2025-5891 actively exploited in the wild?

No public exploit code has been indexed for CVE-2025-5891 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-2025-5891?

CVE-2025-5891 has an EPSS (Exploit Prediction Scoring System) score of 0.7%, placing it in the 51th 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-2025-5891?

CVE-2025-5891 is classified as Uncontrolled Resource Consumption (CWE-400), CWE-1333 (CWE-1333). These weakness types describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2025-5891 published, and has it been updated?

CVE-2025-5891 was published on June 9, 2025 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2025-5891: pm2 — Fixed in 7.0.0

Exploitation Status

Proof-of-concept exploit code exists

CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for CVE-2025-5891.

EPSS Exploitation Probability

via FIRST.org ↗

0.7%probability of exploitation in next 30 days

Lower Risk+0.02%

Lower risk than most CVEs51th percentile — riskier than 51% 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.

2Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream

pm2npm

3.6Mdownloads / week

Description

A vulnerability classified as problematic was found in Unitech pm2 up to 6.0.6. This vulnerability affects unknown code of the file /lib/tools/Config.js. The manipulation leads to inefficient regular expression complexity. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`pm2`	all versions	7.0.0`npm install pm2@7.0.0`

Affected Products

1 product · 1 configurations

Application

pm2keymetric

≤ 6.0.6

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for pm2, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update pm2 to 7.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2025-5891 is resolved across your whole dependency graph.
Workarounds
Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Frequently Asked Questions

A vulnerability classified as problematic was found in Unitech pm2 up to 6.0.6. This vulnerability affects unknown code of the file /lib/tools/Config.js. The manipulation leads to inefficient regular expression complexity. The attack can be initiated remotely. The exploit has been disclosed to the public and may be used.

O3 Security · Impact-Aware SCA

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CVE-2025-5891 — pm2