Security readout for executives and security teams
Plain-English summary
CVE-2026-34960 is a denial-of-service risk in barebox bootloader DHCP handling. A nearby network attacker can send malformed DHCP responses that may make affected systems read beyond packet data and crash. Business impact depends on whether products or embedded systems use vulnerable barebox network boot paths.
Executive priority
Prioritize environments where barebox-based devices are operationally important and share Layer 2 networks with untrusted systems. The expected impact is availability disruption, so urgency is highest for recovery-critical embedded, industrial, or provisioning workflows.
Technical view
barebox before 2026.04.0 reportedly fails to keep the DHCP options pointer within received packet bounds in dhcp_message_type(). Crafted DHCP Offer or ACK packets missing a proper 0xff end marker can trigger an out-of-bounds read. The stated impact is system crash, not confidentiality or code execution.
Likely exposure
Exposure is likely limited to devices or firmware using barebox before 2026.04.0 with DHCP parsing reachable. The attacker must be on the same broadcast domain, so flat provisioning networks, labs, or boot networks with untrusted hosts matter most.
Exploitation context
The bundle does not show CISA KEV listing or evidence of active exploitation. The described attack is adjacent-network and low-complexity, requiring crafted DHCP Offer or ACK traffic on the victim’s broadcast domain.
Researcher notes
The source bundle’s affected metadata is sparse and lacks CPEs, while the description states barebox prior to 2026.04.0. Validate downstream integrations carefully. Evidence supports out-of-bounds read and crash potential only; it does not support code execution or confirmed exploitation.
Mitigation direction
- Upgrade barebox to version 2026.04.0 or later where applicable.
- Check barebox vendor guidance and downstream firmware advisories for product-specific fixes.
- Restrict untrusted hosts from boot or provisioning broadcast domains.
- Use trusted DHCP infrastructure on networks where barebox-based devices boot.
Validation and detection
- Inventory products, firmware, and builds that include barebox.
- Confirm the embedded barebox version for each affected device or image.
- Identify networks where those devices accept DHCP during boot or provisioning.
- Check whether untrusted hosts share those broadcast domains.
- Review vendor or integrator advisories for downstream exposure statements.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-125: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-34960 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.1 (4.0)
- Known Exploited
- No
- Published
Vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N——VulnCheckCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H2.83.6VulnCheckVulnerability scoring details
Base CVSS 4.0 score
7.1HighVector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/barebox/bareboxCVE reference, VulnCheck · product
- https://github.com/barebox/barebox/releases/tag/v2026.04.0CVE reference, VulnCheck · patch
- https://www.vulncheck.com/advisories/barebox-out-of-bounds-read-in-dhcp-option-parsingCVE reference, VulnCheck · third-party-advisory
- Blog PostCVE reference, VulnCheck · technical-description
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.