CVE-2026-34963: barebox version prior to 2026.04.0 contains multiple memory-safety vulnerabilities in the EFI PE loader in efi

Q: How do I fix CVE-2026-34963?

barebox: upgrade to 2026.04.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-34963 being exploited?

CVE-2026-34963 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-2026-34963 affect?

CVE-2026-34963 affects barebox. Severity is high (CVSS 8.4). 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 v

Routine

HIGH 8.4UPGRADE

CVE-2026-34963 is a high-severity flaw (CVSS 8.4) affecting barebox. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	8.4 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-190
Published	2026-05-11
Last modified	2026-07-18

Publisher (CNA): VulnCheck · Vendor: pengutronix

Last updated 2026-07-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-11 23:19 UTCPublished CVE record published
2026-07-18 03:16 UTCUpdated Record last modified

pengutronix barebox UPGRADE

Affected: < 2026.04.0

Fixed in: 2026.04.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2026.04.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade barebox

Note

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

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-2026-34963?

barebox: upgrade to 2026.04.0. Exact commands for each OS are on this page.

Is CVE-2026-34963 being exploited?

CVE-2026-34963 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-2026-34963 affect?

CVE-2026-34963 affects barebox. Severity is high (CVSS 8.4). 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 v

How urgent is CVE-2026-34963?

Priority 31/100. High severity

Related CVEs

CVE-2026-34962 MEDIUM 6.2 UPGRADE barebox version prior to 2026.04.0 contains a denial-of-service vulnerability in ext4 directory parsing in fs/
CVE-2026-34961 MEDIUM 6.2 UPGRADE barebox prior to version 2026.04.0 contains out-of-bounds read vulnerabilities in ext4 extent parsing due to m
CVE-2026-34960 MEDIUM 6.5 UPGRADE barebox prior to version 2026.04.0 contains an out-of-bounds read vulnerability in DHCP option parsing within

References

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