CVE-2026-55453
CUPS ipp backend status-line injection can update queue PPD and lead to conditional RCE as lp via foomatic-rip
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. Prior to 2.4.20, the backend/ipp.c quote_string() function preserves carriage-return and line-feed characters in a remote printer-controlled marker-message before report_attr() writes the value to the scheduler status stream. The scheduler can parse an injected newline as a separate PPD: control line and persist an attacker-selected PPD keyword. The reporter demonstrated that a later print job on a Foomatic-backed queue could consume an injected FoomaticRIPCommandLine value and execute in the filter context as lp. This issue is fixed in version 2.4.20.
Timeline
ID reserved
By GitHub_M
- 4 months later
· 4 months later
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Low3.3 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L |
| NVDNVD · Analyzed | 3.1 | Low3.3 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L |
- EPSS (exploitation in 30 days)
- 0.19% · top 91% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Low 3.3.
Weakness
- CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') (opens in a new tab)All about CWE-74 and its CVEs
- CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection') (opens in a new tab)All about CWE-77 and its CVEs
- CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') (opens in a new tab)All about CWE-78 and its CVEs
Affected products
- affected < 2.4.20
References (4)
- https://github.com/OpenPrinting/cups/security/advisories/GHSA-7hqf-mfhx-7r3v (opens in a new tab)x_refsource_CONFIRM
- https://github.com/OpenPrinting/cups/commit/806e1b483096c51d59432468f4afdd7387d81dd7 (opens in a new tab)x_refsource_MISC
- https://github.com/OpenPrinting/cups/commit/d41cf0616688721e9d435d54118c4c8a36ed596a (opens in a new tab)x_refsource_MISC
- https://github.com/OpenPrinting/cups/releases/tag/v2.4.20 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-55453)Record last updated .