HOMEVULNERABILITIESCVE-2026-34961
HIGH

CVE-2026-34961

CWE-125Published: May 11, 2026· Updated: May 13, 2026

7.7
CVSS v3.1
EPSS:0.01%probability of exploitation in 30 daysPercentile:1.7th

Official Description

barebox prior to version 2026.04.0 contains out-of-bounds read vulnerabilities in ext4 extent parsing due to missing validation of the eh_entries field against buffer capacity in fs/ext4/ext4_common.c. Attackers can supply a malicious ext4 filesystem image via USB, SD card, or network boot to trigger heap out-of-bounds reads during boot-time filesystem parsing, potentially redirecting reads to arbitrary disk offsets.

NVD Source

Technical Analysis

CVE-2026-34961 requires local access, meaning attackers must already have a foothold on the target system.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), availability disruption (denial of service), with a CVSS base score of 7.7.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Affected Vendors & Products

pengutronix1 product
barebox
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
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Official Patches & Advisories

ADVISORYhttps://www.vulncheck.com/advisories/barebox-ext4-extent-parsing-out-of-bounds-read

All References (3)

→
https://github.com/barebox/bareboxProduct
→
https://github.com/barebox/barebox/releases/tag/v2026.04.0Release Notes
→
https://www.vulncheck.com/advisories/barebox-ext4-extent-parsing-out-of-bounds-readThird Party Advisory

Quick Facts

CVE IDCVE-2026-34961
CVSS Score7.7 / 10
SeverityHIGH
WeaknessCWE-125
CISA KEVNo
EPSS (30d)0.01%
Affected1 vendor
PublishedMay 11, 2026

Related CVEs (CWE-125)

CVE-2026-34987
9.9
CVE-2026-42799
9.8
CVE-2026-24213
9.8
CVE-2026-33642
9.8
CVE-2025-15646
9.8
CVE-2026-6920
9.6

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2026-34961 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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