CVE-2026-7645Public exploitNetwork attack vector

Arbitrary file overwrite via unchecked export path

Published May 2, 2026 · Updated May 2, 2026

Path traversal in rUv sublinear-time-solver 1.5.0 allows remote attackers to overwrite files through the MCP export_state tool. The handler passes its filepath argument to fs.writeFileSync without restricting the destination or rejecting absolute and traversal paths. Exploitation requires access to invoke the tool and succeeds only for destinations writable by the MCP server process, enabling file overwrite and service interruption.

CVSS severity6.5
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in rUv sublinear-time-solver 1.5.0 allows remote attackers to overwrite files through the MCP export_state tool. The handler passes its filepath argument to fs.writeFileSync without restricting the destination or rejecting absolute and traversal paths. Exploitation requires access to invoke the tool and succeeds only for destinations writable by the MCP server process, enabling file overwrite and service interruption.

The record

CVE
CVE-2026-7645
Published
May 2, 2026
Updated
May 2, 2026
Vendor
ruvnet
Product
sublinear-time-solver
Classifications
CWE-22, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 2, 2026CVE publishedPublication date reported by the CVE source.
  2. May 2, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.5.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ruvnet · sublinear-time-solverversion=1.5.0

Published CVSS scores

6.4VulDBAV:N/AC:L/Au:N/C:N/I:P/A:P
5.5VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.5VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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