CVE-2026-107886: OpenPrinting CUPS before 2.4.20 contains a double-free in printer-class management

Routine

LOW 2.3UPGRADE

CVE-2026-107886 is a low-severity flaw (CVSS 2.3) affecting cups. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenPrinting CUPS before 2.4.20 contains a double-free in printer-class management. When CUPS-Add-Modify-Class replaces an existing class member list, add_class() frees pclass->printers without clearing the pointer. If subsequent validation fails, the class retains the dangling pointer; CUPS-Delete-Class subsequently frees the same allocation in cupsdDeletePrinter(). A client authorized to modify and delete classes can cause scheduler-wide denial

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	2.3 (Low)
Attack vector	Local
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	0.2% (top 85%)
CISA exploited list	No
Weakness	CWE-415
Published	2026-10-09
Last modified	2026-10-20

Publisher (CNA): MITRE · Vendor: openprinting

Last updated 2026-10-20 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-09 04:18 UTCPublished CVE record published
2026-10-20 20:56 UTCUpdated Record last modified

openprinting cups UPGRADE

Affected: >= 1.4.8 and < 2.4.20

Fixed in: 2.4.20

Safe to downgrade to: a release before 1.4.8

1. Check installed version

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

2. UPGRADE to 2.4.20 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cups

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cups

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 1.4.8 (Debian / Ubuntu)

apt-cache madison cups sudo apt install cups=<VERSION_BEFORE_1.4.8> sudo apt-mark hold cups

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list cups sudo dnf downgrade cups-<VERSION_BEFORE_1.4.8> sudo dnf versionlock add cups

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-2026-107886?

cups: upgrade to 2.4.20. Exact commands for each OS are on this page.

Is CVE-2026-107886 being exploited?

CVE-2026-107886 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-2026-107886 affect?

CVE-2026-107886 affects cups. Severity is low (CVSS 2.3). OpenPrinting CUPS before 2.4.20 contains a double-free in printer-class management. When CUPS-Add-Modify-Class replaces an existing class member list, add_class() frees pclass->printers without clearing the pointer. If subsequent validation

How urgent is CVE-2026-107886?

Priority 17/100. Public exploit reference

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References

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