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

Quick assessment

Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

CUPS 的 中的 函数缺少对源字符串长度的限制，因此可能读取超出源缓冲区末尾的数据，从而导致堆越界读取（heap out-of-bounds read）。该漏洞可通过 中解析由攻击者控制的 SNMP 耗材（supplies）描述信息而被触发。

CVSS 4.3 · Medium
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I. Basic Information for CVE-2026-87875

Vulnerability Information
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Vulnerability Title
Cups: openprinting cups: heap out-of-bounds read in cupsutf32toutf8() via missing source-length bound
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat Hardened Images - cpe:/a:redhat:hummingbird:1
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-87875

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III. Intelligence Information for CVE-2026-87875

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Other References for CVE-2026-87875 (3)

Same Patch Batch · Red Hat · 2026-09-09 · 8 CVEs total

CVE-2026-87766 8.8 HIGH Bubblewrap: bubblewrap: symlink traversal via /oldroot allows writing files outside sandbo
CVE-2026-18147 8.1 HIGH Freeipa: ipa: freeipa/idm: cross-site scripting vulnerability allows arbitrary code execut
CVE-2026-87874 8.1 HIGH Community.general: community.general: memcached cache plugin deserializes untrusted pickle
CVE-2026-87853 7.5 HIGH Sssd: sssd: idp authentication prefix comparison allows cross-user impersonation
CVE-2026-87872 6.8 MEDIUM Community.general: community.general: ocapi module_utils (ocapi_command, ocapi_info) hardc
CVE-2026-19729 4.9 MEDIUM Keycloak-services: keycloak-services: incomplete fix for arbitrary filesystem path probing
CVE-2026-87876 3.0 LOW Cups: openprinting cups: remaining case-insensitive username matching in scheduler side pa

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-125

V. Comments for CVE-2026-87875

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