What is CVE-2018-13348?

CVE-2018-13348 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-2018-13348?

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

Improper input validation in Mercurial

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.

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: 0.021 (81.1th percentile), scored 2026-10-03.

Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: 0.000

Affected products

Mercurial

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.mercurial-scm.org/repo/hg/rev/90a274965de7 (Patch, Vendor Advisory)
www.mercurial-scm.org/wiki/WhatsNew (Vendor Advisory)
lists.debian.org/debian-lts-announce/2020/07/msg00032.html (mailing-list)

Frequently asked questions

What is CVE-2018-13348?: CVE-2018-13348 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-2018-13348?: High severity. CVSS v3 base score is 7.5 out of 10.