How severe is CVE-2026-34963?

CVE-2026-34963 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-34963 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-34963?

CVE-2026-34963 affects Pengutronix Barebox. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-34963?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-34963 have an EU (EUVD) identifier?

Yes. CVE-2026-34963 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29347.

When was CVE-2026-34963 published?

CVE-2026-34963 was published on 2026-05-11 and last updated on 2026-06-17.

CVE-2026-34963

CVE-2026-34963 is a high-severity vulnerability in Pengutronix Barebox with a CVSS 3.x base score of 8.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-190.

Key facts

Severity: High (CVSS 3.x base score 8.4)
CVSS v4: 8.6
EPSS exploit prediction: 0% (5th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-29347
Weakness: CWE-190
Affected product: Pengutronix Barebox
Published: 2026-05-11
Last modified: 2026-06-17

Description

barebox version prior to 2026.04.0 contains multiple memory-safety vulnerabilities in the EFI PE loader in efi/loader/pe.c where integer overflow in virtual image size computation using 32-bit arithmetic on section VirtualAddress and size values allows undersized heap allocation, and PE section loading logic fails to validate that PointerToRawData plus copied size remains within the PE file buffer. An attacker can supply a malicious EFI PE binary via TFTP, USB, SD card, or network boot to trigger heap buffer overflow or out-of-bounds read from heap memory, potentially achieving code execution in bootloader context.

Frequently asked questions

What is CVE-2026-34963?: barebox version prior to 2026.04.0 contains multiple memory-safety vulnerabilities in the EFI PE loader in efi/loader/pe.c where integer overflow in virtual image size computation using 32-bit arithmetic on section VirtualAddress and size values allows undersized heap allocation, and PE section loading logic fails to validate that PointerToRawData plus copied size remains within the PE file buffer. An attacker can supply a malicious EFI PE binary via TFTP, USB, SD card, or network boot to trigger heap buffer overflow or out-of-bounds read from heap memory, potentially achieving code execution in bootloader context.
How severe is CVE-2026-34963?: CVE-2026-34963 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-34963 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (5th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-34963?: CVE-2026-34963 affects Pengutronix Barebox. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-34963?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-34963 have an EU (EUVD) identifier?: Yes. CVE-2026-34963 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-29347.
When was CVE-2026-34963 published?: CVE-2026-34963 was published on 2026-05-11 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:pengutronix:barebox:*:*:*:*:*:*:*:*

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