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CVE-2026-45254— Incorrect libcap_net limitation list manipulation

Quick assessment

Affected
FreeBSD FreeBSD
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.

FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在安全漏洞，该漏洞源于cap_net服务中，当新限制省略旧限制中的键时，缺失键被当作允许任何操作处理，可能导致先前限制部分网络操作的应用程序请求新限制时扩展进程权限。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 3

VendorProduct Version RangeStatus
FreeBSD FreeBSD 15.0-RELEASE< p9 affected
14.4-RELEASE< p5 affected
14.3-RELEASE< p14 affected
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I. Basic Information for CVE-2026-45254

Vulnerability Information
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Vulnerability Title
Incorrect libcap_net limitation list manipulation
Source: CVE Program / CVE List V5
Vulnerability Description
In the case of the cap_net service, when a key present in the old limit was omitted from the new limit, the missing key was treated as "allow any" instead of being rejected. In certain scenarios, an application that had previously restricted a subset of network operations could ask for a new limit that extended the permissions of the process.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
FreeBSD 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeBSD是FreeBSD基金会的一套类Unix操作系统。 FreeBSD存在安全漏洞，该漏洞源于cap_net服务中，当新限制省略旧限制中的键时，缺失键被当作允许任何操作处理，可能导致先前限制部分网络操作的应用程序请求新限制时扩展进程权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FreeBSD FreeBSD 15.0-RELEASE ~ p9 -

II. Public POCs for CVE-2026-45254

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III. Intelligence Information for CVE-2026-45254

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Vendor Advisories for CVE-2026-45254 (1)

Same Patch Batch · FreeBSD · 2026-05-21 · 7 CVEs total

CVE-2026-45250 Stack buffer overflow via setcred(2)
CVE-2026-45252 Heap overflow in FUSE_LISTXATTR
CVE-2026-45255 Remote code execution via installer Wi-Fi access point scans
CVE-2026-45251 Kernel use-after-free via file descriptor syscalls
CVE-2026-45253 Missing validation in ptrace(PT_SC_REMOTE)
CVE-2026-39461 select(2) file descriptor set overflow causes stack overflow

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-269

V. Comments for CVE-2026-45254

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