CVE-2026-77797Hinoki check available

Process crash via malformed Prefetch file

Published Sep 24, 2026 · Updated Sep 24, 2026

Out-of-bounds access in Rapid7 Velociraptor before 0.77.3 allows attackers to crash the process via a malformed Prefetch file. The bundled Prefetch library fails to enforce a buffer boundary while parsing crafted file structures; the exact field and function are undisclosed. The process must parse an attacker-supplied Prefetch file, and the reported consequence is a crash without disclosed code execution or data exposure.

CVSS severityUnavailable
Unscored
EPSS probability0.10%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds access in Rapid7 Velociraptor before 0.77.3 allows attackers to crash the process via a malformed Prefetch file. The bundled Prefetch library fails to enforce a buffer boundary while parsing crafted file structures; the exact field and function are undisclosed. The process must parse an attacker-supplied Prefetch file, and the reported consequence is a crash without disclosed code execution or data exposure.

The record

CVE
CVE-2026-77797
Published
Sep 24, 2026
Updated
Sep 24, 2026
Vendor
Rapid7
Product
Velociraptor
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 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=0 <0.77.3

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Rapid7 · Velociraptorversion=0 <0.77.3

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

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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