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Fencer Intel
low 2.3

CVE-2026-107886 json

OpenPrinting CUPS before 2.4.20 contains a double-free in printer-class management.

published last mo. modified 20d ago also EUVD-2026-95470

cvss
2.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits
0
none known

Summary

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 of service. The default policy requires @SYSTEM privileges.

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

Is CVE-2026-107886 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2026-107886 updated cvss 2.3

cups: cups: Denial of Service via double-free in printer class management

  • 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 Enterprise Linux 6 cups, cups-lpd, cups-php, cups-libs
    not affected: vulnerable code not present

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
last mo.

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/OpenPrinting/cups/security/advisories/GHSA-pwg4-pv39-8c22 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 2.3 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/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.