CVE-2026-45811

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in Apache NimBLE. The HCI socket transport did not check whether a received HCI event would fit the configured event pool before copying it, allowing a buffer overflow. Severity is low: exploitation requires either a misconfigured pool size or a malicious/compromised controller on the other end of the HCI socket link, not over-the-air Bluetooth access. This issue affects Apache NimBLE: through 1.9.0. Users are recommended to upgrade to version 1.10.0, which fixes the issue.

Score

CVSS 3.1 7.5 High

Status

Analyzed - security@apache.org

Published

2026-07-24

Last modified

2026-10-24

Weaknesses

CWE-120

Affected products

• Nimble (Apache)
• Apache Nimble (Apache Software Foundation)

References

• https://github.com/apache/mynewt-nimble/commit/dcc4e4f026109eecd507de9479bb5019306a4a41
• https://lists.apache.org/thread/5mkz68y1py0o6zmxtc3l1o8grtrb78m0
• http://www.openwall.com/lists/oss-security/2026/07/24/11