CVE-2026-107886
Quick assessment
Affected
OpenPrinting CUPS
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.
在 OpenPrinting CUPS 2.4.20 之前的版本中，打印机类管理存在一个双重释放（double-free）漏洞。当 CUPS-Add-Modify-Class 替换现有类成员列表时，add_class() 函数会释放 pclass->printers，但未将指针置空。如果后续验证失败，该类仍将保留悬空指针；随后，CUPS-Delete-Class 在 cupsdDeletePrinter() 中会再次释放同一块内存。任何被授权修改和删除类的客户端均可导致调度器范围内的拒绝服务（DoS）攻击。默认策略
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-107886
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
OpenPrinting CUPS before 2.4.20 contains a double-free in printer-class management. When CUPS-Add-Modify-Class replaces an existing class member list, add_class() frees pclass->printers without clearing the pointer. If subsequent validation fails, the class retains the dangling pointer; CUPS-Delete-Class subsequently frees the same allocation in cupsdDeletePrinter(). A client authorized to modify and delete classes can cause scheduler-wide denial of service. The default policy requires @SYSTEM privileges.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
双重释放
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| OpenPrinting | CUPS | 1.4.8 ~ 2.4.20 | - |
|
II. Public POCs for CVE-2026-107886
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-107886 (1)
Same Patch Batch · OpenPrinting · 2026-10-09 · 4 CVEs total
| CVE-2026-107888 | 5.1 MEDIUM | CUPS<2.4.20空指针解引用致服务终止 |
| CVE-2026-107885 | 3.3 LOW | CUPS<=2.4.20资源耗尽漏洞 |
| CVE-2026-107890 | 3.3 LOW | CUPS漏洞：空指针解引用致服务崩溃 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-107886
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