CVE-2026-45815: Reachable Assertion vulnerability in Apache NimBLE. A specially crafted ATT Read Multiple Variable Response (B

Q: How do I fix CVE-2026-45815?

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

Q: Is CVE-2026-45815 being exploited?

CVE-2026-45815 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-2026-45815 affect?

CVE-2026-45815 affects nimble. Severity is high (CVSS 7.5). Reachable Assertion vulnerability in Apache NimBLE. A specially crafted ATT Read Multiple Variable Response (BLE_ATT_OP_READ_MULT_VAR_RSP) may trigger assert in ATT parser. Severity is medium as this requires DUT to first send ATT Read Mul

Q: How urgent is CVE-2026-45815?

Priority 52/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

This month

HIGH 7.5REMOTEWATCHLISTUPGRADE

CVE-2026-45815 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.

Reachable Assertion vulnerability in Apache NimBLE. A specially crafted ATT Read Multiple Variable Response (BLE_ATT_OP_READ_MULT_VAR_RSP) may trigger assert in ATT parser. Severity is medium as this requires DUT to first send ATT Read Multiple Variable Request. This issue affects Apache NimBLE: through 1.9.0. Users are recommended to upgrade to version 1.10.0, which fixes the issue.

Why this priority

High severity
Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 37%)
CISA exploited list	No
Weakness	CWE-617
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-2026-45815?

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

Is CVE-2026-45815 being exploited?

CVE-2026-45815 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-2026-45815 affect?

CVE-2026-45815 affects nimble. Severity is high (CVSS 7.5). Reachable Assertion vulnerability in Apache NimBLE. A specially crafted ATT Read Multiple Variable Response (BLE_ATT_OP_READ_MULT_VAR_RSP) may trigger assert in ATT parser. Severity is medium as this requires DUT to first send ATT Read Mul

How urgent is CVE-2026-45815?

Priority 52/100. High severity; Remotely exploitable, no login, no user action; On your watchlist

Related CVEs

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-2026-45811 HIGH 7.5 UPGRADE Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in Apache NimBLE. The HCI
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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