Security readout for executives and security teams
Plain-English summary
BusyBox archive extraction can be tricked into writing files outside the chosen extraction directory. If a vulnerable system extracts a malicious archive under the right conditions, important files could be overwritten, potentially leading to code execution.
Executive priority
Treat as high priority where BusyBox handles untrusted archives in images, embedded systems, or operational tooling. Business urgency is lower where archive extraction is tightly controlled, but affected Red Hat Hardened Images should be remediated through vendor updates.
Technical view
CVE-2026-26157 is incomplete path sanitization in BusyBox archive extraction utilities, mapped to CWE-73. CVSS 3.1 is 7.0 with local attack vector, high complexity, no privileges required, user interaction required, and high confidentiality, integrity, and availability impact.
Likely exposure
Confirmed affected data in the bundle names Red Hat Hardened Images with busybox-main 1.37.0-7.2.hum1. Red Hat Enterprise Linux 6 busybox is listed with unknown status. Other exposure should be verified against vendor advisories, including Siemens guidance referenced by the CVE.
Exploitation context
The bundle does not show CISA KEV listing or cited active exploitation. Exploitation requires a malicious archive to be extracted and depends on specific extraction conditions, but successful abuse could overwrite sensitive files and enable follow-on code execution.
Researcher notes
The available evidence supports arbitrary file overwrite risk through archive extraction path handling. Public bundle references an upstream BusyBox archival commit, Red Hat advisory data, Red Hat Bugzilla, and Siemens advisory, but does not provide enough detail here to claim exploit availability or exact fixed versions.
Mitigation direction
- Apply vendor-provided updates from Red Hat advisory RHSA-2026:13831 where applicable.
- Check Siemens and other product vendor guidance for affected embedded BusyBox use.
- Avoid extracting untrusted archives with vulnerable BusyBox utilities.
- Run archive extraction with least privilege in constrained, disposable directories.
- Monitor sensitive system files for unexpected changes after archive handling.
Validation and detection
- Inventory BusyBox versions and package names across images, appliances, and containers.
- Check for Red Hat Hardened Images using busybox-main 1.37.0-7.2.hum1.
- Confirm RHEL 6 busybox status with Red Hat because the bundle marks it unknown.
- Identify workflows that extract attacker-supplied or external archives.
- Verify patched package status against vendor advisory records.
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-73: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-26157 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 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
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:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H15.9redhatCVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H15.9redhat-SADPVulnerability scoring details
Base CVSS 3.1 score
7HighVector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Base CVSS 3.1 score
7HighVector: CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- ADP timelineredhat-SADP
Made public.
- Source timelineredhat
Made public.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- ADP timelineredhat-SADP
Reported to Red Hat.
- Source timelineredhat
Reported to Red Hat.
- 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
- 2026-02-11T17:54:52.728Z: Reported to Red Hat.
- 2026-02-11T00:00:00.000Z: Made public.
Source materials
- CVE List V5 sourceCVE List V5
- RHSA-2026:13831CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-26157CVE reference, redhat · vdb-entry, x_refsource_REDHAT
- RHBZ#2439039CVE reference, redhat · issue-tracking, x_refsource_REDHAT
- https://git.busybox.net/busybox/commit/archival?id=3fb6b31c716669e12f75a2accd31bb7685b1a1cbCVE reference, redhat
- https://cert-portal.siemens.com/productcert/html/ssa-253495.htmlCVE reference, siemens-SADP
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-26157.jsonCVE reference, redhat-SADP · x_sadp-csaf-vex
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.
External Control of File Name or Path
External Control of File Name or Path represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.