CVE-2026-42512General(freebsd / freebsd)

LOWCVSS 8.1 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

As dhclient is building an environment to pass to dhclient-script, it may need to resize the array of string pointers. The code which expands the array incorrectly calculates its new size when requesting memory, resulting in a heap buffer overrun. A specially crafted packet can cause dhclient to overrun its buffer of environment entries. This can result in a crash, but it may be possible to leverage this bug to achieve remote code execution.

freebsd CVEs Back to dashboard

0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories

https://security.freebsd.org/advisories/FreeBSD-SA-26:15.dhclient.asc

Weakness type (CWE)

CWE-122

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

freebsd

Threat summary

4 mentions across 3 observed days
Momentum state: stable

What's happening

Technical details provided in 2 signals
General: 3 classified signals
Disclosure: 1 classified signal
Peaked 2d ago at 2 mentions (2026-04-30); latest day: 1
4 total mentions across 3 days

Affected systems

Vendors

freebsd

Products

freebsd

4 versions affected across 1 product

Deep dive

Activity timeline4 mentions / 3d

Signal classification2 categories

General

375.0%

Disclosure

125.0%

Referenced assets4 URLs

By indicator

Classification over time

Date	Total	Labels

2026-04-30	2	General2
2026-05-09	1	General1
2026-06-06	1	Disclosure1

Full discourse4 posts

Lyrie.ai@lyrie_ai125d
Disclosure
CVE-2026-42512 (CVSS 8.6) – Heap Buffer Overrun in dhclient Array resizing logic in environment variable construction miscalculates new size Specially crafted DHCP packets trigger out-of-bounds write Remotely triggerable, potentially exploitable for code execution
Post summary
The text announces a new heap buffer overrun vulnerability (CVE‑2026‑42512) in dhclient, providing technical details but no evidence of a PoC, exploit code, active exploitation, or patch.
1000047
247 followersView on X
IntegSec@integ_sec153d
General
CVE-2026-42512: FreeBSD dhclient Heap Buffer Overflow - What It Means for Your Business and How to Respond https://hubs.li/Q04g0PmX0
Post summary
The text informs of a FreeBSD dhclient heap buffer overflow CVE and hints at a business impact analysis, but provides no concrete technical, exploit, or mitigation details.
0000035
30 followersView on X
VulDB 🛡@vuldb162d
General
The severity is increased for this new vulnerability affecting FreeBSD (CVE-2026-42512) https://vuldb.com/vuln/360259
Post summary
The note announces that the severity of the new FreeBSD vulnerability CVE-2026-42512 has been increased, but offers no details on exploitation, patches, or technical specifics.
0000047
2.1K followersView on X
Vulmon Vulnerability Feed@VulmonFeeds162d
General
CVE-2026-42512 Heap Buffer Overrun in dhclient Environment Array Resizing via Cr... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-42512 Customizable Vulnerability Alerts: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=4
Post summary
The tweet references CVE-2026-42512, identifies a heap buffer overrun in dhclient, but provides no PoC, exploit details, patch information, or evidence of active exploitation.
0000019
4.0K followersView on X

CPE platform detail37 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

37 of 37 entries

Part	Vendor	Product	Version	Target SW	Target HW
OS	freebsd	freebsd	13.5	-	-
OS	freebsd	freebsd	13.5	-	-
OS	freebsd	freebsd	13.5	-	-
OS	freebsd	freebsd	13.5	-	-
OS	freebsd	freebsd	13.5	-	-
OS	freebsd	freebsd	13.5	-	-
OS	freebsd	freebsd	13.5	-	-
OS	freebsd	freebsd	13.5	-	-
OS	freebsd	freebsd	13.5	-	-
OS	freebsd	freebsd	13.5	-	-
OS	freebsd	freebsd	13.5	-	-
OS	freebsd	freebsd	13.5	-	-
OS	freebsd	freebsd	13.5	-	-
OS	freebsd	freebsd	13.5	-	-
OS	freebsd	freebsd	14.3	-	-
OS	freebsd	freebsd	14.3	-	-
OS	freebsd	freebsd	14.3	-	-
OS	freebsd	freebsd	14.3	-	-
OS	freebsd	freebsd	14.3	-	-
OS	freebsd	freebsd	14.3	-	-
OS	freebsd	freebsd	14.3	-	-
OS	freebsd	freebsd	14.3	-	-
OS	freebsd	freebsd	14.3	-	-
OS	freebsd	freebsd	14.3	-	-
OS	freebsd	freebsd	14.3	-	-
OS	freebsd	freebsd	14.3	-	-
OS	freebsd	freebsd	14.4	-	-
OS	freebsd	freebsd	14.4	-	-
OS	freebsd	freebsd	14.4	-	-
OS	freebsd	freebsd	14.4	-	-
OS	freebsd	freebsd	15.0	-	-
OS	freebsd	freebsd	15.0	-	-
OS	freebsd	freebsd	15.0	-	-
OS	freebsd	freebsd	15.0	-	-
OS	freebsd	freebsd	15.0	-	-
OS	freebsd	freebsd	15.0	-	-
OS	freebsd	freebsd	15.0	-	-

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What researchers are saying

CVE-2026-42512

Lyrie.ai[verified]@lyrie_aiDisclosure

The text announces a new heap buffer overrun vulnerability (CVE‑2026‑42512) in dhclient, providing technical details but no evidence of a PoC, exploit code, active exploitation, or patch.

IntegSec[verified]@integ_secGeneral

The text informs of a FreeBSD dhclient heap buffer overflow CVE and hints at a business impact analysis, but provides no concrete technical, exploit, or mitigation details.

VulDB 🛡@vuldbGeneral

The note announces that the severity of the new FreeBSD vulnerability CVE-2026-42512 has been increased, but offers no details on exploitation, patches, or technical specifics.

Vulmon Vulnerability Feed@VulmonFeedsGeneral

The tweet references CVE-2026-42512, identifies a heap buffer overrun in dhclient, but provides no PoC, exploit details, patch information, or evidence of active exploitation.