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Vulnerabilities

Vulnerability · 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, and is then us

Published Apr 12, 2026 · catalog updated Jul 13, 2026 · In Mesa before 25.3.6

Last checked Nov 12, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-40393. EPSS is 0.43%. Act only if a listed version of In Mesa before 25.3.6 is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (In Mesa before 25.3.6).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.43%
Remediation
Version ranges on file
Affected products
cpe mesa3d/mesa · vendor mesa3d mesa 0 <25.3.6

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe mesa3d/mesa26.0.0
  • vendor mesa3d mesa 0 <25.3.60 <25.3.6

How to fix CVE-2026-40393

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-40393. EPSS is 0.43%. Act only if a listed version of In Mesa before 25.3.6 is installed.

Which versions are affected?

Compare what you have installed with mesa3d mesa 0 <25.3.6 0 <25.3.6. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-787: Out-of-bounds Write. EPSS 0.43%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Apr 12, 2026 · NIST NVD

    Detected

    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.

  2. Jul 13, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-40393

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-40393

    30-day exploitation probability 0.43%

    first.org
  • EUVDVulnerability recordEUVD-2026-21737

    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.

    euvd.enisa.europa.eu
  • NIST NVDVulnerability recordCVE-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, and is then used for alloca.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Nov 12, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • EUVDNov 10, 2026
  • FIRST EPSSNov 9, 2026
  • CVE.orgOct 16, 2026
  • NIST NVDOct 15, 2026