CVE-2026-10849: The hawkBit device management client in subsys/mgmt/hawkbit accumulates the body of an HTTP response from the

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HIGH 8.2REMOTEUPGRADE

CVE-2026-10849 is a high-severity flaw (CVSS 8.2) affecting zephyr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The hawkBit device management client in subsys/mgmt/hawkbit accumulates the body of an HTTP response from the update server into a heap buffer in response_json_cb() (subsys/mgmt/hawkbit/hawkbit.c). The buffer is sized to hold the received body bytes but reserves no space for a terminating NUL. When the full response has arrived, the code writes response_data[downloaded_size] = '\0' — and whenever the accumulated body length equals the allocation,

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	8.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-122, CWE-787
Published	2026-08-03
Last modified	2026-10-23

Publisher (CNA): Zephyr Project · Vendor: zephyrproject

Am I affected?

Timeline

2026-08-03 22:16 UTCPublished CVE record published
2026-10-23 21:10 UTCUpdated Record last modified

zephyrproject zephyr UPGRADE

Affected: >= 2.4.0 and < 4.5.0

Fixed in: 4.5.0

Safe to downgrade to: a release before 2.4.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

Fedora 46 · python-fontconfig · FIXED · 0.6.3-1.fc46 · FEDORA-2026-f92ca8b01f · source

sudo dnf upgrade --advisory=FEDORA-2026-f92ca8b01f

Fedora ELN · valgrind · FIXED · 3.28.0-1.eln159 · FEDORA-2026-c593ef1d15 · source

sudo dnf upgrade --advisory=FEDORA-2026-c593ef1d15

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-39h3-7phx-pwhv

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.

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References

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