CVE-2026-45811: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in Apache NimBLE. The HCI

Q: How do I fix CVE-2026-45811?

nimble: upgrade to 1.10.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-45811 being exploited?

CVE-2026-45811 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-45811 affect?

CVE-2026-45811 affects nimble. Severity is high (CVSS 7.5). 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 buf

Q: How urgent is CVE-2026-45811?

Priority 41/100. High severity; On your watchlist

This month

HIGH 7.5WATCHLISTUPGRADE

CVE-2026-45811 is a high-severity flaw (CVSS 7.5) affecting nimble. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 issu

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 59%)
CISA exploited list	No
Weakness	CWE-120
Published	2026-07-24
Last modified	2026-10-24

Publisher (CNA): Apache Software Foundation · Vendor: apache

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-24 13:18 UTCPublished CVE record published
2026-10-24 13:10 UTCUpdated Record last modified

apache nimble UPGRADE

Affected: < 1.10.0

Fixed in: 1.10.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nimble || rpm -q nimble || nimble --version

2. UPGRADE to 1.10.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nimble

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nimble

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · gnome-shell-extension-tiling-assistant · FIXED · 56-1.fc46 · FEDORA-2026-ebf66a5321 · source

sudo dnf upgrade --advisory=FEDORA-2026-ebf66a5321

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-45811?

nimble: upgrade to 1.10.0. Exact commands for each OS are on this page.

Is CVE-2026-45811 being exploited?

CVE-2026-45811 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-45811 affect?

CVE-2026-45811 affects nimble. Severity is high (CVSS 7.5). 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 buf

How urgent is CVE-2026-45811?

Priority 41/100. High severity; On your watchlist

Software pages

Bluetooth vulnerabilities

Related CVEs

CVE-2026-45815 HIGH 7.5 UPGRADE Reachable Assertion vulnerability in Apache NimBLE. A specially crafted ATT Read Multiple Variable Response (B
CVE-2026-45816 HIGH 7.5 UPGRADE NULL Pointer Dereference vulnerability in Apache NimBLE in LE Long Term Key Request event. This requires disa
CVE-2026-45813 HIGH 8.8 UPGRADE Out-of-bounds Write, Integer Underflow (Wrap or Wraparound) vulnerability in Apache NimBLE BASS service. Impro
CVE-2026-46452 MEDIUM 5.3 UPGRADE Improper Input Validation vulnerability in Apache NimBLE in Mesh Proxy SAR reassembly could result in passing
CVE-2026-45812 MEDIUM 6.5 UPGRADE Incorrect Calculation of Buffer Size vulnerability in Apache NimBLE when processing Legacy Advertising Report

References

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