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.

Published: 2018-07-06 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-13348 is rated Moderate Risk (59.1/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.09%). EPSS rose +1.42% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-13348

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.66% 2.09% +1.42%
2 2026-05-04 0.61% 0.66% +0.05%
3 2025-11-21 — 0.61% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-13348

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2018-13348

GitHub Security Advisory for CVE-2018-13348

GHSA-3v62-ww8w-758m · Severity: high · Ecosystem: pip — Mercurial Improper Input Validation vulnerability

OS Trackers for CVE-2018-13348

vendor priority summary link
debian not yet assigned CVE-2018-13348 not yet assigned priority: Debian including 1 source packages (mercurial), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2018-13348
redhat medium — https://access.redhat.com/security/cve/CVE-2018-13348
suse medium CVE-2018-13348 severity moderate: SUSE including 14 source package names (mercurial-2.3.2-0.18.9.1, mercurial-2.8.2-15.13.1, …), 22 product×package rows across 18 product lines (SUSE Linux Enterprise Module for Basesystem 15 SP4, SUSE Linux Enterprise Module for Basesystem 15 SP5, … (18 product lines)): Fixed 22. https://www.suse.com/security/cve/CVE-2018-13348/
ubuntu medium CVE-2018-13348 medium priority: Ubuntu including 1 source packages (mercurial), 6 status rows across 6 suites (artful, bionic, cosmic, trusty, upstream, xenial): released 4, ignored 1, not-affected 1. https://ubuntu.com/security/CVE-2018-13348

Affected software / configurations for CVE-2018-13348

Vendor Product Version Raw CPE
mercurial mercurial < 4.6.1 cpe:2.3:a:mercurial:mercurial:*:*:*:*:*:*:*:*

References for CVE-2018-13348

cvelogic Threat Intelligence