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Public proof of conceptFix available

CVE-2026-34980

OpenPrinting CUPS: Shared PostScript queue lets anonymous Print-Job requests reach `lp` code execution over the network

A public proof of concept exists; no exploitation attested.

  • Published2026-04-03
  • WeaknessCWE-20

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, in a network-exposed cupsd with a shared target queue, an unauthorized client can send a Print-Job to that shared PostScript queue without authentication. The server accepts a page-border value supplied as textWithoutLanguage, preserves an embedded newline through option escaping and reparse, and then reparses the resulting second-line PPD: text as a trusted scheduler control record. A follow-up raw print job can therefore make the server execute an attacker-chosen existing binary such as /usr/bin/vim as lp. At time of publication, there are no publicly available patches.

Timeline

dates in UTC
  1. 2026-04-0322:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-25 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-34980?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-34980?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Openprinting cups
BranchAffectedFixed in
2.4≤ 2.4.16no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • cupsAlmaLinux:10all versions · fixed in 1:2.4.10-18.el10_2and 7 other packages
  • cupsAlmaLinux:9all versions · fixed in 1:2.3.3op2-39.el9_8and 7 other packages
  • cupsAlmaLinux:8all versions · fixed in 1:2.2.6-68.el8_10and 6 other packages

Vendor advisories

  • CVE-2026-34980 Red Hat Product Security19 products fixed · 14 known affected

    cups: OpenPrinting CUPS: Shared PostScript queue lets anonymous Print-Job requests reach `lp` code execution over the network

    cups as a component of Red Hat Enterprise Linux 6 · cups-devel as a component of Red Hat Enterprise Linux 6 · cups-libs as a component of Red Hat Enterprise Linux 6 · +11 more

  • RHSA-2026:39316 Red Hat Product Security5 products fixed

    Red Hat Security Advisory: cups security update

  • RHSA-2026:39302 Red Hat Product Security5 products fixed

    Red Hat Security Advisory: cups security update

  • RHSA-2026:36733 Red Hat Product Security5 products fixed

    Red Hat Security Advisory: cups security update

  • RHSA-2026:8814 Red Hat Product Security17 products fixed

    Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2026:39316 · 5 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
  2. Vendor fix Red Hat Product Security RHSA-2026:8814 · 17 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
  3. Workaround from the vendor Red Hat Product Security RHSA-2026:39316 · 102 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
  4. No fix planned, says the vendor Red Hat Product Security CVE-2026-34980 · 14 productsOut of support scope

Advisories and patches

Detection

read 2026-10-25 00:28 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedHORKimhab/CVE-2026-34980
PoC-in-GitHub

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 4.0 vector
CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2026-04-03
Last Modified
2026-07-24
NVD status
Analyzed
MSRC Title
OpenPrinting CUPS: Shared PostScript queue lets anonymous Print-Job requests reach `lp` code execution over the network

Frequently asked questions

What is CVE-2026-34980?

OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, in a network-exposed cupsd with a shared target queue, an unauthorized client can send a Print-Job to that shared PostScript queue without authentication. The server accepts a page-border value supplied as textWithoutLanguage, preserves an embedded newline through option escaping and reparse, and then reparses the resulting second-line PPD: text as a trusted scheduler control record. A follow-up raw print job can therefore make the server execute an attacker-chosen existing binary such as /usr/bin/vim as lp. At time of publication, there are no publicly available patches.

Is CVE-2026-34980 actively exploited?

A proof-of-concept exploit exists for CVE-2026-34980, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-34980?

CVE-2026-34980 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

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