CVE-2022-26507: A heap-based buffer overflow exists in XML Decompression DecodeTreeBlock in AT&T Labs Xmill 0.7

Q: How do I fix CVE-2022-26507?

xmill: downgrade or apply the listed mitigation; ecostruxure control expert: upgrade to 15.1; ecostruxure process expert: upgrade to 2021. Exact commands for each OS are on this page.

Q: Is CVE-2022-26507 being exploited?

CVE-2022-26507 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2022-26507 affect?

CVE-2022-26507 affects xmill, ecostruxure control expert, ecostruxure process expert. Severity is critical (CVSS 9.8). A heap-based buffer overflow exists in XML Decompression DecodeTreeBlock in AT&T Labs Xmill 0.7. A crafted input file can lead to remote code execution. This is not the same as any of: CVE-2021-21810, CVE-2021-21811, CVE-2021-21812, CVE-202

Q: How urgent is CVE-2022-26507?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEDOWNGRADEUPGRADEUPGRADE

CVE-2022-26507 is a critical-severity flaw (CVSS 9.8) affecting xmill, ecostruxure control expert, ecostruxure process expert. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A heap-based buffer overflow exists in XML Decompression DecodeTreeBlock in AT&T Labs Xmill 0.7. A crafted input file can lead to remote code execution. This is not the same as any of: CVE-2021-21810, CVE-2021-21811, CVE-2021-21812, CVE-2021-21815, CVE-2021-21825, CVE-2021-21826, CVE-2021-21828, CVE-2021-21829, or CVE-2021-21830. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-787
Published	2022-04-14
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: att · schneider-electric

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-04-14 13:15 UTCPublished CVE record published
2026-06-17 04:35 UTCUpdated Record last modified

att xmill DOWNGRADE

Affected: 0.7

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.7

1. Check installed version

apt-cache policy xmill || rpm -q xmill || xmill --version

2. No fixed release: DOWNGRADE to a release before 0.7 (Debian / Ubuntu)

apt-cache madison xmill sudo apt install xmill=<VERSION_BEFORE_0.7> sudo apt-mark hold xmill

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list xmill sudo dnf downgrade xmill-<VERSION_BEFORE_0.7> sudo dnf versionlock add xmill

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

schneider-electric ecostruxure control expert UPGRADE

Affected: < 15.1 · 15.1

Fixed in: 15.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ecostruxure-control-expert || rpm -q ecostruxure-control-expert || ecostruxure-control-expert --version

2. UPGRADE to 15.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ecostruxure-control-expert

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ecostruxure-control-expert

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

schneider-electric ecostruxure process expert UPGRADE

Affected: < 2021

Fixed in: 2021

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy ecostruxure-process-expert || rpm -q ecostruxure-process-expert || ecostruxure-process-expert --version

2. UPGRADE to 2021 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade ecostruxure-process-expert

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ecostruxure-process-expert

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

schneider-electric remoteconnect MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy remoteconnect || rpm -q remoteconnect || remoteconnect --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-26507?

xmill: downgrade or apply the listed mitigation; ecostruxure control expert: upgrade to 15.1; ecostruxure process expert: upgrade to 2021. Exact commands for each OS are on this page.

Is CVE-2022-26507 being exploited?

CVE-2022-26507 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-26507 affect?

CVE-2022-26507 affects xmill, ecostruxure control expert, ecostruxure process expert. Severity is critical (CVSS 9.8). A heap-based buffer overflow exists in XML Decompression DecodeTreeBlock in AT&T Labs Xmill 0.7. A crafted input file can lead to remote code execution. This is not the same as any of: CVE-2021-21810, CVE-2021-21811, CVE-2021-21812, CVE-202

How urgent is CVE-2022-26507?

Priority 60/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Schneider Electric vulnerabilities

Related CVEs

CVE-2021-21830 CRITICAL 9.8 DOWNGRADE A heap-based buffer overflow vulnerability exists in the XML Decompression LabelDict::Load functionality of AT
CVE-2021-21829 CRITICAL 9.8 DOWNGRADE A heap-based buffer overflow vulnerability exists in the XML Decompression EnumerationUncompressor::Uncompress
CVE-2021-21828 CRITICAL 9.8 DOWNGRADE A heap-based buffer overflow vulnerability exists in the XML Decompression DecodeTreeBlock functionality of AT
CVE-2021-21827 CRITICAL 9.8 DOWNGRADE A heap-based buffer overflow vulnerability exists in the XML Decompression DecodeTreeBlock functionality of AT
CVE-2021-21826 CRITICAL 9.8 DOWNGRADE A heap-based buffer overflow vulnerability exists in the XML Decompression DecodeTreeBlock functionality of AT

References

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