TI-2026-74874 Aliases CVE-2026-61702

Path traversal in OpenPrinting CUPS banner handling discloses files

MEDIUM 63CWE-22Published 2026-10-15 · Updated 2026-10-28

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Information disclosure
Confidentiality · integrity · availability: Low · None · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-22 and the CVSS impact.

Summary

Versions of OpenPrinting CUPS before 2.4.20 are affected. A path traversal flaw (CWE-22) in copy_banner() lets an IPP attribute value escape the banner directory. An unauthenticated remote attacker can make the root scheduler copy the bytes of files it can read into a job sheet that a configured backend delivers to an observable endpoint. An exploit is linked in the references.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00424 36th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed cups (OpenPrinting): 2.4.20Red Hat: 1 advisory

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
OpenPrinting	cups	before 2.4.20	2.4.20	Patch available	CNA

cups VendorOpenPrinting Affected before 2.4.20 Fixed in 2.4.20 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:openprinting:cups::::::::	before 2.4.20	Vulnerable	OpenPrinting

cpe:2.3:a:openprinting:cups:*:*:*:*:*:*:*:* Versions before 2.4.20 Vulnerable ·OpenPrinting

Remediation

Upgrade OpenPrinting CUPS to version 2.4.20. Red Hat's RHSA-2026:84421, released 2026-10-17, updates Red Hat Hardened Images.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Fix · CNA cups (OpenPrinting) Fixed in 2.4.20

Red Hat 1 advisory

RHSA-2026:84421 Released 2026-10-17 · Red Hat rating Important
Red Hat Hardened Images RPMs Security Update
- Red Hat Hardened Images cups-2.4.19-4.6.hum1@aarch64, cups-2.4.19-4.6.hum1@s390x, cups-2.4.19-4.6.hum1@src +22

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Hardened Images	Fixed	RHSA-2026:84421

Timeline

2026-10-16 Threatist record created from CVE-2026-61702
2026-10-20 Fix available: RHSA-2026:84421 · Red Hat
2026-10-20 Fix available: Red Hat Hardened Images · Red Hat
2026-10-20 CVSS score added · Red Hat
2026-10-28 CISA SSVC decision points changed
2026-10-28 Priority changed: LOW → MEDIUM

References

Exploit 1

https://github.com/OpenPrinting/cups/security/advisories/GHSA-gq9p-4w7m-2f5g

Patch 2

Other 1

https://github.com/OpenPrinting/cups/releases/tag/v2.4.20

TI-2025-35903 cups has Authentication bypass with AuthType Negotiate CVSS 3.1HIGH 8.0
TI-2023-17077 CUPS vulnerable to use-after-free in cupsdAcceptClient() CVSS 3.1HIGH 7.1
TI-2026-27200 Path traversal in OpenPrinting cups CVSS 3.1MEDIUM 6.5
TI-2023-04157 OpenPrinting CUPS/libppd Postscript Parsing Heap Overflow CVSS 3.1HIGH 7.0
TI-2026-27201 OpenPrinting CUPS: Heap overflow in `get_options()` CVSS 3.1MEDIUM 5.3
TI-2025-38265 OpenPrinting CUPS vulnerable to stack based out-of-bound write CVSS 3.1MEDIUM 6.7

See all 24 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences