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CVE-2026-6180: A race condition exists in PaperCut MF when processing badge-swipe data from certain HP multifunction devices

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HIGH 8.1REMOTEUPGRADEUPGRADE

CVE-2026-6180 is a high-severity flaw (CVSS 8.1) affecting papercut mf, papercut ng. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A race condition exists in PaperCut MF when processing badge-swipe data from certain HP multifunction devices. Under specific network conditions involving dropped packets and out-of-order sequence counters, the server may incorrectly process fragmented data chunks. If a sequence reset notification fails to reach the server, the server may reject the initial data chunk while erroneously accepting subsequent chunks before a connection reset complet

Why this priority

  • High severity
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score8.1 (High)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededNone
User interactionNone
EPSS exploit chance0.3% (top 73%)
CISA exploited listNo
WeaknessCWE-20, CWE-367
Published2026-05-05
Last modified2026-10-26
Publisher (CNA): PaperCut · Vendor: papercut

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Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

papercut papercut mf UPGRADE
Affected: < 24.1.9 · >= 25.0.2 and < 25.0.10
Fixed in: 24.1.9, 25.0.10
Safe to downgrade to: a release before 25.0.2
1. Check installed version
apt-cache policy papercut-mf || rpm -q papercut-mf || papercut-mf --version
2. UPGRADE to 24.1.9 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade papercut-mf
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade papercut-mf
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 25.0.2 (Debian / Ubuntu)
apt-cache madison papercut-mf sudo apt install papercut-mf=<VERSION_BEFORE_25.0.2> sudo apt-mark hold papercut-mf
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list papercut-mf sudo dnf downgrade papercut-mf-<VERSION_BEFORE_25.0.2> sudo dnf versionlock add papercut-mf
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.
papercut papercut ng UPGRADE
Affected: < 24.1.9 · >= 25.0.2 and < 25.0.10
Fixed in: 24.1.9, 25.0.10
Safe to downgrade to: a release before 25.0.2
1. Check installed version
apt-cache policy papercut-ng || rpm -q papercut-ng || papercut-ng --version
2. UPGRADE to 24.1.9 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade papercut-ng
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade papercut-ng
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 25.0.2 (Debian / Ubuntu)
apt-cache madison papercut-ng sudo apt install papercut-ng=<VERSION_BEFORE_25.0.2> sudo apt-mark hold papercut-ng
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list papercut-ng sudo dnf downgrade papercut-ng-<VERSION_BEFORE_25.0.2> sudo dnf versionlock add papercut-ng
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.
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-2026-6180?

papercut mf: upgrade to 24.1.9, 25.0.10; papercut ng: upgrade to 24.1.9, 25.0.10. Exact commands for each OS are on this page.

Is CVE-2026-6180 being exploited?

CVE-2026-6180 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-2026-6180 affect?

CVE-2026-6180 affects papercut mf, papercut ng. Severity is high (CVSS 8.1). A race condition exists in PaperCut MF when processing badge-swipe data from certain HP multifunction devices. Under specific network conditions involving dropped packets and out-of-order sequence counters, the server may incorrectly proces

How urgent is CVE-2026-6180?

Priority 40/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

References

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