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Fencer Intel
low 3.3

CVE-2026-107890 json

OpenPrinting CUPS before 2.4.20 contains a NULL pointer dereference caused by repeated IPP group tags in job-creation requests.

published last mo. modified 20d ago also EUVD-2026-95477

cvss
3.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

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 crash when the client can reach the scheduler and submit jobs to an accepting, enabled queue supporting the submitted document format. Anonymous submission is possible when permitted by listener and access-control configuration.

Patch / fix

  • OpenPrinting CUPS 2.4.20
  • cups hummingbird 1 2.4.19-4.5.hum1
  • cups-lpd hummingbird 1 2.4.19-4.5.hum1
  • cups-libs hummingbird 1 2.4.19-4.5.hum1
  • cups-client hummingbird 1 2.4.19-4.5.hum1
  • cups-ipptool hummingbird 1 2.4.19-4.5.hum1
  • cups-filesystem hummingbird 1 2.4.19-4.5.hum1
  • cups-printerapp hummingbird 1 2.4.19-4.5.hum1

red hat advisories RHSA-2026:81410

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-107890 updated cvss 3.3

cups: cups: Denial of Service via repeated IPP group tags

  • Red Hat Enterprise Linux 6 cups, cups-lpd, cups-php, cups-libs
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 7 cups, cups-lpd, cups-libs, cups-client, cups-ipptool, cups-filesystem Red Hat Enterprise Linux 8 cups, cups-lpd, cups-libs, cups-client, cups-ipptool, cups-filesystem Red Hat Enterprise Linux 9 cups, cups-lpd, cups-libs, cups-client, cups-ipptool, cups-filesystem, +1 more Red Hat Enterprise Linux 10 cups
    affected: no fix available “Fix deferred”
  • Red Hat Hardened Images cups 2.4.19-4.5.hum1, cups-lpd 2.4.19-4.5.hum1, cups-libs 2.4.19-4.5.hum1, cups-client 2.4.19-4.5.hum1, cups-ipptool 2.4.19-4.5.hum1, cups-filesystem 2.4.19-4.5.hum1, +1 more
    fixed: vendor fix RHSA-2026:81410

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
27d ago

Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/OpenPrinting/cups/security/advisories/GHSA-wjc4-qhjr-5m5x referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 3.3 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • OpenPrinting CUPS

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.