CVE-2022-26507Known exploitationPublic exploitNetwork attack vector

Remote code execution via unchecked block index

Published Apr 14, 2022 · Updated Aug 3, 2024

A heap-based buffer overflow in AT&T Labs Xmill 0.7 allows remote attackers to execute code through a crafted compressed XML file. DecodeTreeBlock uses an attacker-controlled tag identifier as an unchecked index into blockarray, allowing a forged heap object and virtual table to redirect execution. Exploitation requires XDemill to process malicious XMI or embedded APX content, including during an engineering-workstation project upload.

CVSS severity9.8
Critical
EPSS probability2.42%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A heap-based buffer overflow in AT&T Labs Xmill 0.7 allows remote attackers to execute code through a crafted compressed XML file. DecodeTreeBlock uses an attacker-controlled tag identifier as an unchecked index into blockarray, allowing a forged heap object and virtual table to redirect execution. Exploitation requires XDemill to process malicious XMI or embedded APX content, including during an engineering-workstation project upload.

The record

CVE
CVE-2022-26507
Published
Apr 14, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/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.

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

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 exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution

Public exploit references

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

Reported exploitation

Technologies

Your stack

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Your stack

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