CVE-2018-17983

cext/manifest.c in Mercurial before 4.7.2 has an out-of-bounds read during parsing of a malformed manifest entry.

Published: 2018-10-04 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-17983 is rated High Risk (65.5/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 2.03%). EPSS rose +1.59% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize 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-2018-17983

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 0.45% 2.03% +1.59%
2 2025-08-30 0.23% 0.45% +0.22%
3 2025-03-30 — 0.23% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-17983

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.1 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H 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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.2 [email protected]
6.4 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:P 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:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 4.9 [email protected]

Weakness enumeration for CVE-2018-17983

GitHub Security Advisory for CVE-2018-17983

GHSA-p575-cf9h-wv42 · Severity: high · Ecosystem: pip — Mercurial Out-of-bounds Read vulnerability

OS Trackers for CVE-2018-17983

vendor priority summary link
debian unimportant CVE-2018-17983 unimportant 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-2018-17983
redhat medium — https://access.redhat.com/security/cve/CVE-2018-17983
suse medium CVE-2018-17983 severity moderate: SUSE including 13 source package names (mercurial, mercurial-4.5.2-3.6.1, …), 20 product×package rows across 16 product lines (SUSE Linux Enterprise Module for Basesystem 15 SP4, SUSE Linux Enterprise Module for Basesystem 15 SP5, … (16 product lines)): Fixed 18, Known Not Affected 2. https://www.suse.com/security/cve/CVE-2018-17983/
ubuntu medium CVE-2018-17983 medium priority: Ubuntu including 1 source packages (mercurial), 12 status rows across 12 suites (bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, trusty, upstream, xenial): not-affected 8, released 3, ignored 1. https://ubuntu.com/security/CVE-2018-17983

Affected software / configurations for CVE-2018-17983

Vendor Product Version Raw CPE
mercurial mercurial < 4.7.2 cpe:2.3:a:mercurial:mercurial:*:*:*:*:*:*:*:*

References for CVE-2018-17983

cvelogic Threat Intelligence