CVE-2026-86439Patch

LOWCVSS 8.7 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

knowns versions before 0.30.0 fail to validate filesystem paths in MCP tool arguments, allowing attackers to read, create, overwrite and delete files outside the project directory. Attackers can supply path arguments containing directory traversal sequences to access arbitrary Markdown files accessible to the server process.

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0.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-22

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Threat summary

Patch or workaround signal is available
1 mentions across 1 observed day

What's happening

Patch or workaround mentioned in 1 signal
Technical details provided in 1 signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Patch

1100.0%

Full discourse1 post

DFIR Lab@DFIR_Lab47d
Patch
🚨 HIGH SEVERITY: CVE-2026-86439 (CVSS 8.8) Path traversal flaw in knowns <0.30.0 allows attackers to read/write/delete files outside project directory via MCP tool arguments. Patch immediately to v0.30.0+ #CVE #Vulnerability #PatchNow https://t.co/Mpj42rKZ0N
Post summary
The tweet announces a high‑severity path‑traversal vulnerability in knowns <0.30.0, provides technical details, and stresses the need to upgrade to v0.30.0 or later to apply the vendor patch.
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130 followersView on X

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