CVE-2026-40393Disclosure(mesa3d / mesa)

LOWCVSS 9.8 · CRITICAL

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

Patch mesa3d mesa systems immediately
Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft

Recommended action window: High priority (within 72h)

NVD description

In Mesa before 25.3.6 and 26 before 26.0.1, out-of-bounds memory access can occur in WebGPU because the amount of to-be-allocated data depends on an untrusted party, and is then used for alloca.

mesa3d CVEs Back to dashboard

2.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-787

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

STABLE

Are you affected?

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

mesa

Threat summary

Public PoC is present in monitored signal
Patch or workaround signal is available
4 mentions across 3 observed days
Momentum state: stable

What's happening

PoC mentioned or linked in 1 signal
Patch or workaround mentioned in 1 signal
Technical details provided in 2 signals
Disclosure: 3 classified signals
Peaked 2d ago at 2 mentions (2026-04-12); latest day: 1
4 total mentions across 3 days

Affected systems

Vendors

mesa3d

Products

mesa

1 version affected across 1 product

Deep dive

Activity timeline4 mentions / 3d

Signal classification2 categories

Disclosure

375.0%

Patch

125.0%

Referenced assets5 URLs

By indicator

Classification over time

Date	Total	Labels

2026-04-12	2	Disclosure2
2026-04-13	1	Disclosure1
2026-05-08	1	Patch1

Full discourse4 posts

VulDB 🛡@vuldb179d
Disclosure
A new vulnerability with increased severity was disclosed for mesa3d Mesa (CVE-2026-40393) https://vuldb.com/vuln/357042
Post summary
A new vulnerability, CVE-2026-40393 affecting Mesa, has been disclosed with higher severity, but no technical, exploitation, or mitigation details are provided.
0001091
2.1K followersView on X
Ferramentas Linux@Cezar_H_Linux154d
Patch
CVE-2026-40393 isn't going anywhere. Check your #openSUSE Mesa version, run this 1‑minute script, and lock down WebGPU for good Read more - > https://tinyurl.com/5n6hwtww #Security https://t.co/GaivOvkoAi
Post summary
The post presents a short script that users can run to disable WebGPU on openSUSE Mesa, effectively mitigating CVE‑2026‑40393.
0000053
1.5K followersView on X
CVE@CVEnew179d
Disclosure
CVE-2026-40393 In Mesa before 25.3.6 and 26 before 26.0.1, out-of-bounds memory access can occur in WebGPU because the amount of to-be-allocated data depends on an untrusted party, … https://www.cve.org/CVERecord?id=CVE-2026-40393
Post summary
The post discloses CVE‑2026‑40393 as an out‑of‑bounds memory access in Mesa’s WebGPU before version 25.3.6 (and 26 before 26.0.1).
00000113
57.1K followersView on X
Vulmon Vulnerability Feed@VulmonFeeds179d
Disclosure
CVE-2026-40393 Out-of-Bounds Memory Access in Mesa WebGPU Before 25.3.6 and 26.0... https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-40393 Vulnerability Alert Subscriptions: https://alerts.vulmon.com/?utm_source=twitter&utm_medium=social&utm_campaign=2102281&utm_content=1
Post summary
The tweet announces CVE-2026-40393, detailing an out‑of‑bounds memory access in Mesa WebGPU before specified versions, and provides a link to additional vulnerability information, but offers no PoC, exploit, patch, or active exploitation evidence.
0000059
4.0K followersView on X

CPE platform detail2 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

2 of 2 entries

Part	Vendor	Product	Version	Target SW	Target HW
App	mesa3d	mesa	-	-	-
App	mesa3d	mesa	26.0.0	-	-

Explore more

Back to dashboard mesa3d CVEs mesa vulnerabilities

What researchers are saying

CVE-2026-40393

VulDB 🛡@vuldbDisclosure

A new vulnerability, CVE-2026-40393 affecting Mesa, has been disclosed with higher severity, but no technical, exploitation, or mitigation details are provided.

Ferramentas Linux@Cezar_H_LinuxPatch

The post presents a short script that users can run to disable WebGPU on openSUSE Mesa, effectively mitigating CVE‑2026‑40393.

CVE@CVEnewDisclosure

The post discloses CVE‑2026‑40393 as an out‑of‑bounds memory access in Mesa’s WebGPU before version 25.3.6 (and 26 before 26.0.1).

Vulmon Vulnerability Feed@VulmonFeedsDisclosure

The tweet announces CVE-2026-40393, detailing an out‑of‑bounds memory access in Mesa WebGPU before specified versions, and provides a link to additional vulnerability information, but offers no PoC, exploit, patch, or active exploitation evidence.