How severe is CVE-2025-70347?

CVE-2025-70347 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2025-70347 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2025-70347?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-70347 have an EU (EUVD) identifier?

Yes. CVE-2025-70347 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-207260.

When was CVE-2025-70347 published?

CVE-2025-70347 was published on 2026-02-10 and last updated on 2026-06-17.

CVE-2025-70347

CVE-2025-70347 is a medium-severity vulnerability with a CVSS 3.x base score of 5.5. 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: Medium (CVSS 3.x base score 5.5)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-207260
Weakness: CWE-400
Published: 2026-02-10
Last modified: 2026-06-17

Description

An issue in mquickjs before commit 74b7e (2026-01-15) allows a local attacker to cause a denial of service via a crafted file to the get_mblock_size function at mquickjs.c.

Frequently asked questions

What is CVE-2025-70347?: An issue in mquickjs before commit 74b7e (2026-01-15) allows a local attacker to cause a denial of service via a crafted file to the get_mblock_size function at mquickjs.c.
How severe is CVE-2025-70347?: CVE-2025-70347 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2025-70347 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2025-70347?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-70347 have an EU (EUVD) identifier?: Yes. CVE-2025-70347 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-207260.
When was CVE-2025-70347 published?: CVE-2025-70347 was published on 2026-02-10 and last updated on 2026-06-17.

References

https://github.com/bellard/mquickjs/issues/56

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