CVE-2026-22593Public exploit

Local code execution via off-by-one filename copy

Published Mar 26, 2026 · Updated Mar 26, 2026

Stack buffer overflow in EVerest Core before 2026.02.0 allows local users to execute code via a crafted certificate filename. The get_dir_numbered_file_names function accepts a 100-byte directory entry, then strcpy copies 101 bytes including the terminator into file_names[idx]. Control of a filename in the PKI or CA directory is the required local gate; successful stack corruption crashes IsoMux or executes code in its process context.

CVSS severity8.4
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in EVerest Core before 2026.02.0 allows local users to execute code via a crafted certificate filename. The get_dir_numbered_file_names function accepts a 100-byte directory entry, then strcpy copies 101 bytes including the terminator into file_names[idx]. Control of a filename in the PKI or CA directory is the required local gate; successful stack corruption crashes IsoMux or executes code in its process context.

The record

CVE
CVE-2026-22593
Published
Mar 26, 2026
Updated
Mar 26, 2026
Vendor
EVerest
Product
EVerest Core
Classifications
CWE-193, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 26, 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=< 2026.02.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

EVerest · EVerest Coreversion=< 2026.02.0

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.4GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-193Off-by-one Error
T1203Exploitation for Client Execution

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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