CVE-2026-35547

Local system panic via unchecked message size

Published Apr 30, 2026 · Updated Apr 30, 2026

Heap overflow in FreeBSD libnv 13.5-RELEASE through 15.0-RELEASE allows local users to crash or panic the system via crafted IPC messages. When libnv parses an incoming message header, it fails to reject an inconsistent size field before message processing writes beyond the allocated heap buffer. The confirmed consequence is a crash or system panic; the vendor states that privilege escalation by an unprivileged user remains unconfirmed.

CVSS severity8.1
High
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap overflow in FreeBSD libnv 13.5-RELEASE through 15.0-RELEASE allows local users to crash or panic the system via crafted IPC messages. When libnv parses an incoming message header, it fails to reject an inconsistent size field before message processing writes beyond the allocated heap buffer. The confirmed consequence is a crash or system panic; the vendor states that privilege escalation by an unprivileged user remains unconfirmed.

The record

CVE
CVE-2026-35547
Published
Apr 30, 2026
Updated
Apr 30, 2026
Vendor
The FreeBSD Project
Product
FreeBSD
Classifications
CWE-122, CWE-130, T1068
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 30, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=13.5-RELEASE <p13
  2. Affected versionversion=14.3-RELEASE <p12
  3. Affected versionversion=14.4-RELEASE <p3
  4. Affected versionversion=15.0-RELEASE <p7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The FreeBSD Project · FreeBSDversion=13.5-RELEASE <p13; version=14.3-RELEASE <p12; version=14.4-RELEASE <p3; version=15.0-RELEASE <p7

Published CVSS scores

8.1CISA-ADPCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
CWE-130Improper Handling of Length Parameter Inconsistency
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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