What’s Vulnerable › Vulnerabilities

CVE-2026-87875: Cups: openprinting cups: heap out-of-bounds read in cupsutf32toutf8() via missing source-length bound

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-09 · updated 2026-10-21
• Weakness: CWE-125

Description

The cupsUTF32ToUTF8() function in CUPS's cups/transcode.c lacks a source-length bound and can read past the end of the source buffer, resulting in a heap out-of-bounds read. This is reachable via SNMP supply-description parsing in backend/snmp-supplies.c with attacker-controlled content.

Affected products

• Red Hat OpenShift Container Platform 4.18: all versions
• Red Hat Enterprise Linux 10: all versions
• Red Hat Enterprise Linux 6: all versions
• Red Hat Enterprise Linux 7: all versions
• Red Hat Enterprise Linux 8: all versions
• Red Hat Enterprise Linux 9: all versions
• Red Hat Hardened Images: all versions — fixed in 2.4.19-4.1.hum1

How to fix

Upgrade to a fixed version: Red Hat Hardened Images 2.4.19-4.1.hum1. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/errata/RHSA-2026:66600
• https://access.redhat.com/security/cve/CVE-2026-87875
• https://bugzilla.redhat.com/show_bug.cgi?id=2530994
• https://github.com/OpenPrinting/cups/commit/0c6842fc615e8afa284136a092da8178abf5f142
• https://github.com/OpenPrinting/cups/commit/2b1dc178a2d2325135b855142e384f4e8c42d8e4
• https://github.com/OpenPrinting/cups/security/advisories/GHSA-559w-7676-3xrq
• https://github.com/OpenPrinting/cups/security/advisories/GHSA-559w-7676-3xrq

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