VDB-360290 · CVE-2026-35547 · WID-SEC-2026-1324

FreeBSD Message heap-based overflow

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.6	$5k-$25k	0.00

Summaryinfo

A vulnerability classified as critical was found in FreeBSD. The impacted element is an unknown function of the component Message Handler. Such manipulation leads to heap-based overflow. This vulnerability is referenced as CVE-2026-35547. No exploit is available. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability, which was classified as critical, has been found in FreeBSD (version unknown). Affected by this issue is an unknown function of the component Message Handler. The manipulation with an unknown input leads to a heap-based overflow vulnerability. Using CWE to declare the problem leads to CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was published by Mariusz Zaborski. The advisory is available at security.freebsd.org. This vulnerability is handled as CVE-2026-35547 since 04/28/2026. The exploitation is known to be easy. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $5k-$25k at the moment (estimation calculated on 05/01/2026).

Applying a patch is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-1324). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

FreeBSD Project FreeBSD OS

Productinfo

Type

Operating System

Name

FreeBSD

License

open-source

Website

Product: https://www.freebsd.org/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Heap-based overflow
CWE: CWE-122 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Timelineinfo

04/28/2026 CVE reserved
04/30/2026 +2 days Advisory disclosed
04/30/2026 +0 days VulDB entry created
05/01/2026 +1 days VulDB entry last update

Sourcesinfo

Product: freebsd.org

Advisory: security.freebsd.org
Researcher: Mariusz Zaborski
Status: Confirmed

CVE: CVE-2026-35547 (🔒)
GCVE (CVE): GCVE-0-2026-35547
GCVE (VulDB): GCVE-100-360290
CERT Bund: WID-SEC-2026-1324 - FreeBSD Project FreeBSD OS: Mehrere Schwachstellen

Entryinfo

Created: 04/30/2026 12:33
Updated: 05/01/2026 03:54
Changes: 04/30/2026 12:33 (54), 05/01/2026 03:54 (7)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.