What is CVE-2026-26127?

CVE-2026-26127 is a high-severity vulnerability in Microsoft Microsoft.bcl.memory, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-03-10.

How severe is CVE-2026-26127?

High severity. CVSS v3 base score is 7.5 out of 10.

Out-of-bounds Read in Microsoft Microsoft.bcl.memory

CVE-2026-26127

Out-of-bounds read in .NET allows an unauthorized attacker to deny service over a network.

Vulnerability class: Buffer Overflow

EPSS: 0.001 (27.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C.

Affected products

Microsoft Microsoft.bcl.memory — versions 10.0.0, 9.0.0
Microsoft .Net 10.0 — versions 10.0.0
Microsoft .Net 9.0 — versions 9.0.0

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

.NET Denial of Service Vulnerability (vendor-advisory, patch)

Frequently asked questions

What is CVE-2026-26127?: CVE-2026-26127 is a high-severity vulnerability in Microsoft Microsoft.bcl.memory, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-03-10.
How severe is CVE-2026-26127?: High severity. CVSS v3 base score is 7.5 out of 10.