7.5

CVE-2026-26127: microsoft bcl.memory Out-of-bounds Read

CVSS: 7.5v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-26127CGA-3m5m-4hj9-q87gCGA-h594-w7h9-vx2v
Published 10-03-2026Last modified 19-06-2026
Open JSON

Vulnerability summary

CVE-2026-26127 is a high (CVSS 7.5) Out-of-bounds Read vulnerability in microsoft bcl.memory. EPSS estimates a 1.22% chance of exploitation in the next 30 days, higher than 68.2% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
1.22%
0%100%
Low · -0.83 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 1 · Downstream 8 · Related 3
GHSA-C8GQ-RHQH-WGWMRHSA-2026:10083RHSA-2026:10085RHSA-2026:4443RHSA-2026:4445RHSA-2026:4450

Timeline

  1. 10-03-2026
    PublishedVulnerability first disclosed.
  2. 19-06-2026
    Last modifiedVulnerability information updated.

Description

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

CVSS metrics

6 scores · 6 sources · 1 version

EPSS trend

Probability

1.22%

Chance of exploitation in the next 30 days

Percentile

68%

Versus all other CVEs

30-day change

-0.83 pp

From 2.05% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.22%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

NuGet13 products
  • Microsoft.Bcl.Memory≥ 9.0.0, < 9.0.14 | ≥ 10.0.0, < 10.0.4
  • Microsoft.NETCore.App.Runtime.linux-arm≥ 9.0.0, < 9.0.14 | ≥ 10.0.0, < 10.0.4
  • Microsoft.NETCore.App.Runtime.linux-arm64≥ 9.0.0, < 9.0.14 | ≥ 10.0.0, < 10.0.4
  • Microsoft.NETCore.App.Runtime.linux-musl-arm≥ 9.0.0, < 9.0.14 | ≥ 10.0.0, < 10.0.4
  • Microsoft.NETCore.App.Runtime.linux-musl-arm64≥ 9.0.0, < 9.0.14 | ≥ 10.0.0, < 10.0.4
Microsoft5 products
Ubuntu3 products
  • dotnet10< 10.0.104-10.0.4-0ubuntu1~24.04.1 | < 10.0.104-10.0.4-0ubuntu1~25.10.1
  • dotnet7All versions (No fix recorded)
  • dotnet9< 9.0.115-9.0.14-0ubuntu1~25.10.1
Chainguard2 products
  • dotnet-bootstrap-10All versions (No fix recorded)
  • dotnet-bootstrap-9< 9.0.115-r0
Wolfi2 products
  • dotnet-bootstrap-10All versions (No fix recorded)
  • dotnet-bootstrap-9< 9.0.115-r0

5 vendors · 25 products

References

9 links