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Fencer Vulns
medium 5.3

CVE-2026-61702 json

OpenPrinting CUPS: root-side banner file disclosure

published 2026-10-15 24 d ago modified 2026-10-28 11 d ago also EUVD-2026-102208

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits
0
none known

Summary

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. Prior to 2.4.20, copy_banner() in scheduler/ipp.c uses the attacker-controlled IPP attributes-natural-language value as a directory component beneath DataDir/banners when processing a job-sheets banner. The job-sheets value must first match a registered banner basename, and the traversed path must contain a matching reachable basename; selecting an arbitrary target as demonstrated additionally requires pre-positioned path state such as a symlink with that basename. Subject to the scheduler's filesystem and sandbox access, path separators in the language value can escape the intended banner directory, make the root scheduler open the reachable file, and copy its bytes into a job-sheet spool object that a configured backend can deliver to an attacker-observable endpoint. This issue is fixed in version 2.4.20.

Patch / fix

  • openprinting cups 2.4.20
  • cups hummingbird 1 2.4.19-4.6.hum1
  • cups-lpd hummingbird 1 2.4.19-4.6.hum1
  • cups-libs hummingbird 1 2.4.19-4.6.hum1
  • cups-client hummingbird 1 2.4.19-4.6.hum1
  • cups-ipptool hummingbird 1 2.4.19-4.6.hum1
  • cups-filesystem hummingbird 1 2.4.19-4.6.hum1
  • cups-printerapp hummingbird 1 2.4.19-4.6.hum1

red hat advisories RHSA-2026:84421

  • cups openSUSE Tumbleweed 2.4.20-1.1

opensuse advisories openSUSE-SU-2026:12192-1

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-2026-61702 updated cvss 5.3

cups: cups: Information disclosure via path traversal in banner processing

  • Red Hat Hardened Images cups 2.4.19-4.6.hum1, cups-lpd 2.4.19-4.6.hum1, cups-libs 2.4.19-4.6.hum1, cups-client 2.4.19-4.6.hum1, cups-ipptool 2.4.19-4.6.hum1, cups-filesystem 2.4.19-4.6.hum1, +1 more
    fixed: vendor fix RHSA-2026:84421

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
yes
Technical impact
partial
Assessed
11 d ago

Exploit prediction

0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/OpenPrinting/cups/security/advisories/GHSA-gq9p-4w7m-2f5g referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

  • OpenPrinting cups

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

References

Sources

Fencer Vulns 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.