Vulnerability · Published Oct 15, 2026 · Assigned by GitHub_M
CVE-2026-61702OpenPrinting CUPS: root-side banner file disclosure
Medium 5.3
In plain English
A medium-severity path traversal in cups from OpenPrinting. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 37% of all known vulnerabilities).
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | cups | no fix listed | DEBIAN-CVE-2026-61702 |
| Debian:13 | cups | no fix listed | DEBIAN-CVE-2026-61702 |
| Debian:14 | cups | no fix listed | DEBIAN-CVE-2026-61702 |
| Ubuntu:22.04:LTS | cups | no fix listed | UBUNTU-CVE-2026-61702 |
| Ubuntu:24.04:LTS | cups | no fix listed | UBUNTU-CVE-2026-61702 |
| Ubuntu:26.04:LTS | cups | no fix listed | UBUNTU-CVE-2026-61702 |
| Ubuntu:26.10 | cups | no fix listed | UBUNTU-CVE-2026-61702 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| OpenPrinting | cups | < 2.4.20 |
Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
References
- https://github.com/OpenPrinting/cups/security/advisories/GHSA-gq9p-4w7m-2f5g x_refsource_CONFIRM
- https://github.com/OpenPrinting/cups/commit/08a8a277ce2a8948a1af33552247a1ac53b72df3 x_refsource_MISC
- https://github.com/OpenPrinting/cups/commit/6650428234616a97d3298e0e2d4419c62c1339d2 x_refsource_MISC
- https://github.com/OpenPrinting/cups/releases/tag/v2.4.20 x_refsource_MISC