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CVE Record

CVE-2018-1000132: Mercurial version 4.5 and earlier contains a Incorrect Access Control (CWE-285) vulnerability in Protocol s...

Mercurial version 4.5 and earlier contains a Incorrect Access Control (CWE-285) vulnerability in Protocol server that can result in Unauthorized data access. This attack appear to be exploitable via network connectivity. This vulnerability appears to have been fixed in 4.5.1.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

Mercurial 4.5 and earlier had an access-control flaw in its protocol server that could let a network-connected attacker access data they should not see. The sources state it was fixed in Mercurial 4.5.1. No provided source or KEV status supports active exploitation.

Executive priority

Treat this as a targeted remediation item for legacy source-control infrastructure. Urgency rises if Mercurial is internet-facing or hosts sensitive intellectual property. Patch or isolate affected services, but do not characterize it as actively exploited based on the provided evidence.

Technical view

CVE-2018-1000132 is described as CWE-285 incorrect access control in the Mercurial protocol server, affecting versions 4.5 and earlier. Impact is unauthorized data access over network connectivity. Available sources do not provide CVSS metrics, detailed exploit prerequisites, or product-specific exposure beyond Mercurial and vendor package advisories.

Likely exposure

Exposure is most likely where Mercurial 4.5 or earlier serves repositories over a network, including self-hosted repository infrastructure and older Linux distribution packages not updated through Debian or Red Hat security channels.

Exploitation context

The CVE record says the issue appears exploitable via network connectivity. The provided bundle does not include exploit reports, public weaponization details, or CISA KEV listing, so active exploitation should not be assumed.

Researcher notes

The bundle gives limited technical detail: vulnerable component, impact, network reachability, and fixed version. It does not provide CVSS, commit details, exploit mechanics, or affected downstream package ranges. Validate against vendor advisory package versions rather than assuming upstream version strings alone.

Mitigation direction

  • Upgrade Mercurial to 4.5.1 or later where directly managed.
  • Apply relevant Debian or Red Hat security updates for packaged Mercurial.
  • Restrict network access to Mercurial protocol services until patched.
  • Review vendor guidance for affected distribution package versions.
  • Prioritize repositories containing sensitive code, credentials, or regulated data.

Validation and detection

  • Inventory all Mercurial server instances and installed package versions.
  • Identify network-exposed Mercurial repository services and access paths.
  • Confirm versions are newer than 4.5 or vendor-patched equivalents.
  • Review repository permissions for unintended broad access.
  • Check repository access logs for unusual reads where available.
Prepared
Confidence
medium
Sources
7

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2018-1000132 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
0Timeline events
0ADP providers
6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.