What is CVE-2018-13346?

CVE-2018-13346 is a high-severity vulnerability in Mercurial, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2018-07-06.

How severe is CVE-2018-13346?

High severity. CVSS v3 base score is 7.5 out of 10.

Improper input validation in Mercurial

CVE-2018-13346

The mpatch_apply function in mpatch.c in Mercurial before 4.6.1 incorrectly proceeds in cases where the fragment start is past the end of the original data, aka OVE-20180430-0004.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2018-07-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.

EPSS exploit prediction

EPSS: 0.024 (83.1th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 83rd percentile — 83.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.024 · newest: 0.024 · change: 0.000

Affected products

Mercurial

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.mercurial-scm.org/wiki/WhatsNew (Third Party Advisory)
www.mercurial-scm.org/repo/hg/rev/faa924469635 (Patch, Third Party Advisory)
access.redhat.com/errata/RHSA-2019:2276 (vendor-advisory)
lists.debian.org/debian-lts-announce/2020/07/msg00032.html (mailing-list)

Frequently asked questions

What is CVE-2018-13346?: CVE-2018-13346 is a high-severity vulnerability in Mercurial, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2018-07-06.
How severe is CVE-2018-13346?: High severity. CVSS v3 base score is 7.5 out of 10.