How severe is CVE-2018-13348?

CVE-2018-13348 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2018-13348 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-13348?

CVE-2018-13348 affects Mercurial. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-13348?

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.

When was CVE-2018-13348 published?

CVE-2018-13348 was published on 2018-07-06 and last updated on 2026-06-17.

CVE-2018-13348

CVE-2018-13348 is a high-severity vulnerability in Mercurial with a CVSS 3.x base score of 7.5. 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-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Mercurial
Published: 2018-07-06
Last modified: 2026-06-17

Description

The mpatch_decode function in mpatch.c in Mercurial before 4.6.1 mishandles certain situations where there should be at least 12 bytes remaining after the current position in the patch data, but actually are not, aka OVE-20180430-0001.

Frequently asked questions

What is CVE-2018-13348?: The mpatch_decode function in mpatch.c in Mercurial before 4.6.1 mishandles certain situations where there should be at least 12 bytes remaining after the current position in the patch data, but actually are not, aka OVE-20180430-0001.
How severe is CVE-2018-13348?: CVE-2018-13348 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2018-13348 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-13348?: CVE-2018-13348 affects Mercurial. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-13348?: 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.
When was CVE-2018-13348 published?: CVE-2018-13348 was published on 2018-07-06 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:mercurial:mercurial:*:*:*:*:*:*:*:*

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