Security readout for executives and security teams
Plain-English summary
A malicious tar archive can trick BusyBox extraction into changing files outside the chosen folder. If a privileged process extracts that archive, important system files could be modified, creating a path to privilege escalation. The risk is highest where automated or admin workflows extract untrusted archives as root.
Executive priority
Treat this as a high-priority hygiene and image-update issue, especially for build pipelines, appliances, and privileged automation. It is not currently evidenced as exploited, but it can affect core system integrity when unsafe archive extraction is present.
Technical view
The flaw involves unvalidated hardlink or symlink entries during BusyBox tar extraction, enabling arbitrary file modification outside the intended destination. The provided CVSS is 7.0 high with local attack vector, high complexity, no privileges required, and user interaction required.
Likely exposure
Confirmed affected scope in the bundle includes Red Hat Hardened Images with busybox-main 1.37.0-7.2.hum1. Red Hat Enterprise Linux 6 is listed with unknown status. Siemens has an advisory reference, but affected Siemens product details are not provided in this bundle.
Exploitation context
The CVE is not marked as CISA KEV, and the bundle provides no evidence of active exploitation. Exploitation requires a crafted archive to be extracted, and business impact depends on whether extraction happens with elevated privileges or in sensitive automation.
Researcher notes
Focus validation on BusyBox tar behavior with archive entries that resolve outside the extraction root. Do not assume broad BusyBox exposure beyond listed products without vendor confirmation. The bundle points to an upstream BusyBox archival commit and Red Hat tracking resources.
Mitigation direction
- Apply vendor-provided BusyBox or image updates when available.
- Review RHSA-2026:13831 for Red Hat remediation guidance.
- Do not extract untrusted tar archives with elevated privileges.
- Use isolated, least-privilege extraction workflows for archives.
- Check Siemens SSA-253495 if Siemens products are in scope.
Validation and detection
- Inventory BusyBox versions and packages across images and systems.
- Check for busybox-main 1.37.0-7.2.hum1 in Red Hat Hardened Images.
- Identify automated workflows that extract tar archives as root.
- Confirm whether RHEL 6 exposure remains unknown in vendor guidance.
- Track Red Hat VEX and advisory updates for status changes.
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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. 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-2026-26158 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
- 2026-02-11T18:09:00.001Z: 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-2026-26158CVE reference, redhat · vdb-entry, x_refsource_REDHAT
- RHBZ#2439040CVE 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-2026-26158.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.