CVE-2026-55453: OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems

Q: How do I fix CVE-2026-55453?

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

Q: Is CVE-2026-55453 being exploited?

CVE-2026-55453 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-2026-55453 affect?

CVE-2026-55453 affects cups. Severity is low (CVSS 3.3). OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. Prior to 2.4.20, the backend/ipp.c quote_string() function preserves carriage-return and line-feed characters in a remote printer-controlle

Q: How urgent is CVE-2026-55453?

Priority 24/100. Public exploit reference; On your watchlist

Routine

LOW 3.3WATCHLISTUPGRADE

CVE-2026-55453 is a low-severity flaw (CVSS 3.3) affecting cups. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. Prior to 2.4.20, the backend/ipp.c quote_string() function preserves carriage-return and line-feed characters in a remote printer-controlled marker-message before report_attr() writes the value to the scheduler status stream. The scheduler can parse an injected newline as a separate PPD: control line and persist an attacker-selected PPD keyword. T

Why this priority

Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	3.3 (Low)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-74, CWE-77, CWE-78
Published	2026-10-15
Last modified	2026-10-20

Publisher (CNA): GitHub, Inc. · Vendor: openprinting

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

Am I affected?

Timeline

2026-10-15 18:17 UTCPublished CVE record published
2026-10-20 19:38 UTCUpdated Record last modified

openprinting cups UPGRADE

Affected: < 2.4.20

Fixed in: 2.4.20

Safe to downgrade to: no unaffected older release

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.

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-2026-55453?

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

Is CVE-2026-55453 being exploited?

CVE-2026-55453 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-2026-55453 affect?

CVE-2026-55453 affects cups. Severity is low (CVSS 3.3). OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. Prior to 2.4.20, the backend/ipp.c quote_string() function preserves carriage-return and line-feed characters in a remote printer-controlle

How urgent is CVE-2026-55453?

Priority 24/100. Public exploit reference; On your watchlist

Related CVEs

CVE-2026-107885 LOW 3.3 UPGRADE OpenPrinting CUPS through 2.4.20 contains a resource-exhaustion vulnerability in the submission-timeout handli
CVE-2026-107886 LOW 2.3 UPGRADE OpenPrinting CUPS before 2.4.20 contains a double-free in printer-class management
CVE-2026-107888 MEDIUM 5.1 UPGRADE OpenPrinting CUPS before 2.4.20 contains a NULL pointer dereference in cupsdCheckJobs() when a job marked job-
CVE-2026-107890 LOW 3.3 UPGRADE OpenPrinting CUPS before 2.4.20 contains a NULL pointer dereference caused by repeated IPP group tags in job-c
CVE-2026-55467 LOW 2.5 UPGRADE OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems

References

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