Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-87876

CVE-2026-87876LOW

Red Hat Red Hat Hardened Images — Cups: openprinting cups: remaining case-insensitive username matching in scheduler side paths (cve-2026-27447 follow-up)

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   A   L   L   R  U  L  N  N    3.0   .0033   24.3     —

AFFECTED
  Product                                 Versions     Fixed
  Red Hat Hardened Images                 unspecified  2.4.19-4.2.hum1
  Red Hat Enterprise Linux 10             unspecified  —
  Red Hat Enterprise Linux 6              unspecified  —
  Red Hat Enterprise Linux 7              unspecified  —
  Red Hat Enterprise Linux 8              unspecified  —
  Red Hat Enterprise Linux 9              unspecified  —
  Red Hat Enterprise Linux 9              unspecified  —
  Red Hat OpenShift Container Platform 4  unspecified  —

TIMELINE
  Sep 9   Reserved by redhat
  Sep 9   Published (CNA: redhat)
  Sep 21  PATCH SHIPPED — CVE-2026-87876 (Red Hat Hardened Images). Fixed in Red Hat Hardened Images 2.4.19-4.2.hum1.

CWE-178 · CNA: redhat · CVSS v3.1 · 6 references · NVD status: Awaiting Analysis

Description

Two case-insensitive comparisons on request-derived usernames outside the main authorization path in CUPS's scheduler (printer ACL validation and private-attribute filtering) could allow bypass of username-based access controls in certain configurations.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 9, 2026	Reserved	Reserved by redhat
September 9, 2026	Published	Published (CNA: redhat)
September 21, 2026	PATCH SHIPPED	PATCH SHIPPED — CVE-2026-87876 (Red Hat Hardened Images). Fixed in Red Hat Hardened Images 2.4.19-4.2.hum1.

Affected

Affected products and packages — 8 rows
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Red Hat	Red Hat Hardened Images	—	—	2.4.19-4.2.hum1
Red Hat	Red Hat Enterprise Linux 10	—	—	—
Red Hat	Red Hat Enterprise Linux 6	—	—	—
Red Hat	Red Hat Enterprise Linux 7	—	—	—
Red Hat	Red Hat Enterprise Linux 8	—	—	—
Red Hat	Red Hat Enterprise Linux 9	—	—	—
Red Hat	Red Hat Enterprise Linux 9	—	—	—
Red Hat	Red Hat OpenShift Container Platform 4	—	—	—

Weaknesses

CWE-178

References (6)

https://access.redhat.com/errata/RHSA-2026:67568 [vendor-advisory, x_refsource_REDHAT]
https://access.redhat.com/security/cve/CVE-2026-87876 [vdb-entry, x_refsource_REDHAT]
https://bugzilla.redhat.com/show_bug.cgi?id=2530991 [issue-tracking, x_refsource_REDHAT]
https://github.com/OpenPrinting/cups/commit/88e67c00c130a45f3a1edf36686f7a0b2982fef8
https://github.com/OpenPrinting/cups/commit/f56844dbe4a54a9f8e1aeb3b913fbee614156bdb
https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2

Authoritative record: CVE-2026-87876 at cve.org

Vendors: red hat

Weaknesses: CWE-178

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-87876 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.