CVE-2026-107890: OpenPrinting CUPS before 2.4.20 contains a NULL pointer dereference caused by repeated IPP group tags in job-c

Q: How do I fix CVE-2026-107890?

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

Q: Is CVE-2026-107890 being exploited?

CVE-2026-107890 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-2026-107890 affect?

CVE-2026-107890 affects cups. Severity is low (CVSS 3.3). OpenPrinting CUPS before 2.4.20 contains a NULL pointer dereference caused by repeated IPP group tags in job-creation requests. IPP parsing creates unnamed separator attributes with IPP_TAG_ZERO, but add_job() converts these separators to I

Q: How urgent is CVE-2026-107890?

Priority 18/100. Public exploit reference

Routine

LOW 3.3UPGRADE

CVE-2026-107890 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 before 2.4.20 contains a NULL pointer dereference caused by repeated IPP group tags in job-creation requests. IPP parsing creates unnamed separator attributes with IPP_TAG_ZERO, but add_job() converts these separators to IPP_TAG_JOB. During job startup, get_options()/ipp_length() subsequently calls strlen() on a NULL attribute name, terminating cupsd and disrupting all queues. A single crafted Print-Job request can trigger the c

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	3.3 (Low)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-476
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 05:16 UTCPublished CVE record published
2026-10-20 20:53 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-2026-107890?

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

Is CVE-2026-107890 being exploited?

CVE-2026-107890 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-2026-107890 affect?

CVE-2026-107890 affects cups. Severity is low (CVSS 3.3). OpenPrinting CUPS before 2.4.20 contains a NULL pointer dereference caused by repeated IPP group tags in job-creation requests. IPP parsing creates unnamed separator attributes with IPP_TAG_ZERO, but add_job() converts these separators to I

How urgent is CVE-2026-107890?

Priority 18/100. Public exploit reference

Related CVEs

CVE-2026-39316 MEDIUM 4.0 UPGRADE OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems
CVE-2026-41079 MEDIUM 4.3 UPGRADE OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems
CVE-2026-39314 MEDIUM 4.0 UPGRADE OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems
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

References

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