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CVE-2026-35547— Heap overflow in libnv

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，该漏洞源于处理传入消息标头时未能正确验证消息大小，可能导致恶意程序写入堆分配边界之外，进而触发崩溃或系统恐慌，并可能被利用提升权限。

AI Predicted 7.8 Difficulty: Hard EPSS 0.32% · P25

Affected Version Matrix 4

VendorProduct Version RangeStatus
FreeBSD FreeBSD 15.0-RELEASE< p7 affected
14.4-RELEASE< p3 affected
14.3-RELEASE< p12 affected
13.5-RELEASE< p13 affected
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I. Basic Information for CVE-2026-35547

Vulnerability Information
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Vulnerability Title
Heap overflow in libnv
Source: CVE Program / CVE List V5
Vulnerability Description
When processing the header of an incoming message, libnv failed to properly validate the message size. The lack of validation allows a malicious program to write outside the bounds of a heap allocation. This can trigger a crash or system panic, and it may be possible for an unprivileged user to exploit the bug to elevate their privileges.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
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，该漏洞源于处理传入消息标头时未能正确验证消息大小，可能导致恶意程序写入堆分配边界之外，进而触发崩溃或系统恐慌，并可能被利用提升权限。
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 ~ p7 -

II. Public POCs for CVE-2026-35547

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III. Intelligence Information for CVE-2026-35547

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Vendor Advisories for CVE-2026-35547 (1)

Same Patch Batch · FreeBSD · 2026-04-30 · 6 CVEs total

CVE-2026-42511 Remote code execution via malicious DHCP options
CVE-2026-7164 pf can overflow the stack parsing crafted SCTP packets
CVE-2026-7270 Local privilege escalation via execve()
CVE-2026-42512 Remotely triggerable out-of-bounds heap write in dhclient
CVE-2026-39457 Stack overflow via select() file descriptor set overflow

IV. Related Vulnerabilities

Same product: FreeBSD
Same vendor: FreeBSD
Same weakness: CWE-122

V. Comments for CVE-2026-35547

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