Security readout for executives and security teams
Plain-English summary
A malformed ISO file can crash software that uses affected libarchive packages, interrupting the application or service. The issue does not expose or alter data according to the supplied CVSS assessment, but availability impact can be high when untrusted ISO files are processed.
Executive priority
Prioritize internet-facing, automated, or business-critical workflows that ingest ISO files. Treat this as a timely availability remediation rather than an emergency compromise response. Confirm update coverage because the supplied bundle lacks complete affected and fixed version ranges.
Technical view
Libarchive improperly validates the ISO9660 Rock Ridge zisofs `pz_log2_bs` field. A crafted value can trigger undefined behavior, incorrect memory allocation, and an application crash. The supplied CVSS 3.1 score is 6.5, with user interaction required and impact limited to availability.
Likely exposure
Exposure is most likely where affected Red Hat systems, containers, or applications process ISO files from untrusted or externally influenced sources. The bundle identifies affected RHEL 7–10, OpenShift 4 components, and Red Hat Hardened Images; RHEL 6 status is unknown. Exact affected version ranges are incomplete.
Exploitation context
The supplied record is not in CISA KEV, and the source bundle provides no evidence of active exploitation. Exploitation requires a crafted ISO file to be processed, consistent with the CVSS user-interaction requirement. No confidentiality or integrity impact is identified.
Researcher notes
CWE-1335 concerns incorrect bitwise shift behavior, consistent with inadequate validation of `pz_log2_bs`. The primary outcome described is incorrect allocation followed by a possible crash. The bundle references an upstream pull request, but does not provide enough detail to assert exact fixed releases or broader platform coverage.
Mitigation direction
- Inventory libarchive packages across the listed Red Hat systems, images, containers, and OpenShift components.
- Apply vendor-provided updates identified by RHSA-2026:8944 wherever that advisory applies.
- Check current Red Hat guidance for affected products not explicitly covered by the supplied advisory.
- Until updated, restrict processing of ISO files from untrusted or externally influenced sources.
Validation and detection
- Compare installed libarchive package versions with current Red Hat CVE and errata guidance.
- Confirm RHEL, Hardened Images, and OpenShift inventories include the affected packages listed in the record.
- Use approved regression tests to confirm malformed ISO input is rejected without crashing.
- Monitor applications that process ISO files for abnormal termination or repeated availability failures.
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-1335: 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 lookupContainer behavior lookup
The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-4426 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
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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
1 official scoreWe 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:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H2.83.6redhatVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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.
- Source timelineredhat
Made public.
- Source timelineredhat
Reported to Red Hat.
- 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
- RHSA-2026:8944CVE reference, redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-4426CVE reference, redhat · vdb-entry, x_refsource_REDHAT
- RHBZ#2449010CVE reference, redhat · issue-tracking, x_refsource_REDHAT
- https://github.com/libarchive/libarchive/pull/2897CVE reference, redhat
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.
Incorrect Bitwise Shift of Integer
Incorrect Bitwise Shift of Integer represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.