Security readout for executives and security teams
Plain-English summary
Dotmesh can mishandle symlinks while unpacking archives. If an attacker can supply the archive, Dotmesh may read or write files outside the intended folder using the Dotmesh process permissions. This can expose sensitive files or alter system/application files.
Executive priority
Treat this as high priority for any active Dotmesh environment that handles external or semi-trusted archives. If Dotmesh is not deployed, urgency is low; if deployed in automation or shared environments, reduce exposure quickly.
Technical view
CVE-2020-26312 affects dotmesh versions 0.8.1 and prior. The `untarFile` extraction guard can be bypassed through chained symlinks, allowing archive entries to escape the target directory. Impact is arbitrary file read and/or write with CVSS 8.1. The source says no patch was available at publication.
Likely exposure
Exposure is most likely where Dotmesh imports, restores, or unpacks archives supplied by users, tenants, automation, or less-trusted systems. Systems running Dotmesh with broad filesystem permissions face greater business risk.
Exploitation context
The provided sources do not show active exploitation, and KEV is false. Exploitation requires control over an archive processed by Dotmesh and depends on the filesystem permissions of the process performing extraction.
Researcher notes
The core issue is symlink traversal during tar extraction, similar to archive escape flaws. The affected routine attempted path containment but allowed chained links that resolve outside the archive root. Current exploit-in-the-wild evidence is not provided.
Mitigation direction
- Inventory Dotmesh deployments and versions, especially 0.8.1 and prior.
- Do not process untrusted Dotmesh archives until vendor guidance is confirmed.
- Run archive extraction with least-privileged accounts and filesystem isolation.
- Monitor the GitHub Security Lab advisory and Dotmesh repository for fixes.
- Consider retiring or replacing unsupported Dotmesh deployments if no patch exists.
Validation and detection
- Identify workflows that import, restore, or unpack Dotmesh archive content.
- Confirm whether archive input can be influenced by users or external systems.
- Review Dotmesh process permissions on exposed hosts.
- Check for filesystem writes outside expected extraction paths during archive operations.
- Verify whether a vendor patch or documented mitigation has since been adopted.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-125: Exact CWE lookup
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Open ATT&CK lookupCWE-787: Exact CWE lookup
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Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2020-26312 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 8.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
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.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N2.85.2Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
8.1HighVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.