Is CVE-2026-34960 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-34960 being exploited in the wild.

How severe is CVE-2026-34960?

Medium severity, with a CVSS score of 6.5, published 11 May 2026.

Is there a fix for CVE-2026-34960?

A patch was published on 2026-04-17: Version 2026.04.0 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-34960 attacked?

It is attacked from the adjacent network, in an operating system.

Am I affected by CVE-2026-34960?

Check whether you run Barebox at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-34960: barebox out-of-bounds read in DHCP option parsing

CVE-2026-34960 · Severity: medium · CVSS 6.5 · Published 2026-05-11

barebox, an open-source bootloader used in embedded systems, is vulnerable to a flaw in how it processes network configuration requests. An attacker on the same local network can send a specially crafted network packet that causes the system to crash during the startup process. This could lead to a denial-of-service, preventing the device from booting or operating correctly.

Technologies: Barebox. Vendors: Barebox.

Quick answers

Is CVE-2026-34960 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-34960 being exploited in the wild.
How severe is CVE-2026-34960?: Medium severity, with a CVSS score of 6.5, published 11 May 2026.
Which products and versions are affected?: Barebox prior to 2026.04.0.
Is there a fix for CVE-2026-34960?: A patch was published on 2026-04-17: Version 2026.04.0 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-34960 attacked?: It is attacked from the adjacent network, in an operating system.
Am I affected by CVE-2026-34960?: Check whether you run Barebox at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An out-of-bounds read vulnerability exists in the dhcp_message_type() function of the barebox bootloader. The issue stems from a failure to verify that the options pointer remains within the bounds of the received packet during DHCP option parsing. Specifically, if a crafted DHCP Offer or ACK packet is received without a proper 0xff end marker, the parser may read past the valid packet data. This can be exploited by an unauthenticated attacker on the same broadcast domain to cause a denial-of-service (system crash). The vulnerability is addressed in version 2026.04.0.

Affected products

barebox barebox prior to 2026.04.0

Timeline

2026-04-17: patched: Version 2026.04.0 released
2026-05-11: advisory: CVE-2026-34960 published

References

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