How severe is CVE-2025-58451?

CVE-2025-58451 has a CVSS 4.0 base score of 8.7, rated high severity.

Is CVE-2025-58451 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-58451?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-58451 have an EU (EUVD) identifier?

Yes. CVE-2025-58451 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27175.

When was CVE-2025-58451 published?

CVE-2025-58451 was published on 2025-09-08 and last updated on 2026-06-17.

CVE-2025-58451

CVE-2025-58451 is a high-severity vulnerability with a CVSS 4.0 base score of 8.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: High (CVSS 4.0 base score 8.7)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-27175
Weakness: CWE-400
Published: 2025-09-08
Last modified: 2026-06-17

Description

Cattown is a JavaScript markdown parser. Versions prior to 1.0.2 used regular expressions with inefficient, potentially exponential worst-case complexity. This could cause excessive CPU usage due to excessive backtracking on crafted inputs. In turn, the excessive CPU usage could lead to resource exhaustion, where processing malicious inputs could cause high CPU or memory usage, potentially leading to denial of service. Version 1.0.2 contains a patch. Additionally, users should review and restrict input sources if untrusted inputs are processed.

Frequently asked questions

What is CVE-2025-58451?: Cattown is a JavaScript markdown parser. Versions prior to 1.0.2 used regular expressions with inefficient, potentially exponential worst-case complexity. This could cause excessive CPU usage due to excessive backtracking on crafted inputs. In turn, the excessive CPU usage could lead to resource exhaustion, where processing malicious inputs could cause high CPU or memory usage, potentially leading to denial of service. Version 1.0.2 contains a patch. Additionally, users should review and restrict input sources if untrusted inputs are processed.
How severe is CVE-2025-58451?: CVE-2025-58451 has a CVSS 4.0 base score of 8.7, rated high severity.
Is CVE-2025-58451 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-58451?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-58451 have an EU (EUVD) identifier?: Yes. CVE-2025-58451 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-27175.
When was CVE-2025-58451 published?: CVE-2025-58451 was published on 2025-09-08 and last updated on 2026-06-17.

References

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