CVE-2018-17983
CVE-2018-17983 is a critical-severity vulnerability in Mercurial with a CVSS 3.x base score of 9.1. 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-125.
Key facts
- Severity: Critical (CVSS 3.x base score 9.1)
- CVSS v2: 6.4
- EPSS exploit prediction: 2% (79th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-125
- Affected product: Mercurial
- Published:
- Last modified:
Description
cext/manifest.c in Mercurial before 4.7.2 has an out-of-bounds read during parsing of a malformed manifest entry.
Frequently asked questions
- What is 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.
- How severe is CVE-2018-17983?
- CVE-2018-17983 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability high.
- Is CVE-2018-17983 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-2018-17983?
- CVE-2018-17983 affects Mercurial. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2018-17983?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2018-17983 published?
- CVE-2018-17983 was published on 2018-10-04 and last updated on 2026-06-17.
References
- https://www.mercurial-scm.org/repo/hg/rev/5405cb1a7901
- https://www.mercurial-scm.org/wiki/WhatsNew#Mercurial_4.7.2_.282018-10-01.29
Affected products (1)
- cpe:2.3:a:mercurial:mercurial:*:*:*:*:*:*:*:*
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