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Message-ID: <85f79b2d-d477-4734-8fd8-940d4130fc9d@redhat.com>
Date: Mon, 5 Oct 2026 17:18:52 +0200
From: Zdenek Dohnal <zdohnal@...hat.com>
To: oss-security@...ts.openwall.com
Subject: [cups] Multiple security fixes in incoming new version 2.4.20
Hi all!
due heavy load of security reports and long queues of Github CNA we had
re-evaluate our security policies to the following points:
- we do embargoes for vulnerabilities with CVSS score > 7.0, which will
be announced on proper security lists
- we use GHSA ids for vulnerabilities under CVSS score 7.0, and we
commit the fix and publish the advisory without embargo - this point was
applied because of long queue for getting CVE id and severity of fixes
was not severe to go via full embargo process. Those vulnerabilities
will be repeated on oss-security list right before new version release,
with links to the relevant advisories where are links to the patching
commits. Some of the issues might have CVE ids, because the id was assigned
For more details check SECURITY.md in CUPS project.
The new soon-to-be version 2.4.20 includes fixes:
SECURITY-5.7: CVE-2026-55480: copy_model() creates a predictable PPD
tempfile without O_EXCL/O_NOFOLLOW (CVE-2026-55480)
https://github.com/OpenPrinting/cups/security/advisories/GHSA-jj94-x3qh-ffp9
SECURITY-5.5: Unauthenticated read-only IPP attribute filter bypass
in cupsd leads to persistent denial of service (and job-status forgery)
(GHSA-7j85-5r23-xhvh)
https://github.com/OpenPrinting/cups/security/advisories/GHSA-7j85-5r23-xhvh
SECURITY-5.3: CVE-2026-61702: root-side banner file disclosure
(CVE-2026-61702)
https://github.com/OpenPrinting/cups/security/advisories/GHSA-gq9p-4w7m-2f5g
SECURITY-4.6: CUPS: malformed IPP attribute names bypass
CVE-2026-34980 mitigations (GHSA-w9hj-hq9p-m7f6)
https://github.com/OpenPrinting/cups/security/advisories/GHSA-w9hj-hq9p-m7f6
SECURITY-4.3: Heap out-of-bounds read in cupsUTF32ToUTF8() via
missing source-length bound — reachable from SNMP supply-description
parsing (backend/snmp-supplies.c) (CVE-2026-87875)
https://github.com/OpenPrinting/cups/security/advisories/GHSA-559w-7676-3xrq
SECURITY-4.1: NULL pointer dereference in cupsdCheckJobs crashes
cupsd after temporary printer deletion (GHSA-qqm8-4q5h-jg55)
https://github.com/OpenPrinting/cups/security/advisories/GHSA-qqm8-4q5h-jg55
SECURITY-3.4: `job-presets-supported` member values allow PPD filter
injection and code execution as lp under some circumstances
(GHSA-fw7q-ww8w-phx8)
https://github.com/OpenPrinting/cups/security/advisories/GHSA-fw7q-ww8w-phx8
SECURITY-3.3: Unauthenticated Denial of Service in cupsd via Repeated
IPP Group Tags (GHSA-wjc4-qhjr-5m5x)
https://github.com/OpenPrinting/cups/security/advisories/GHSA-wjc4-qhjr-5m5x
SECURITY-3.3: CUPS ipp backend status-line injection can update queue
PPD and lead to conditional RCE as lp via foomatic-rip (CVE-2026-55453)
https://github.com/OpenPrinting/cups/security/advisories/GHSA-7hqf-mfhx-7r3v
SECURITY-3.0: ZDI-CAN-33033: OpenPrinting CUPS Scheduler
Configuration Time-Of-Check Time-Of-Use Local Privilege Escalation
Vulnerability (GHSA-gj33-wxpv-6fgg)
https://github.com/OpenPrinting/cups/security/advisories/GHSA-gj33-wxpv-6fgg
SECURITY-3.0: CVE-2026-27447 follow-up: remaining case-insensitive
username matching in scheduler side paths (CVE-2026-87876)
https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2
SECURITY-2.5: Argument injection in mailto notifier allows
unauthenticated remote code execution (CVE-2026-105326)
https://github.com/OpenPrinting/cups/security/advisories/GHSA-r4wf-366f-f6g3
SECURITY-2.5: CUPS fax option values bypass the CVE-2026-34980
control-character sanitizer (incomplete fix) (CVE-2026-55467)
https://github.com/OpenPrinting/cups/security/advisories/GHSA-69qc-prxg-h2c7
SECURITY-2.3: Double-free in cupsd class management via
CUPS-Add-Modify-Class and CUPS-Delete-Class (GHSA-pwg4-pv39-8c22)
https://github.com/OpenPrinting/cups/security/advisories/GHSA-pwg4-pv39-8c22
Have a nice day!
Zdenek
--
Zdenek Dohnal
Senior Software Engineer
Red Hat, BRQ-TPBC
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