[This CNA information record relates to multiple CVEs; the text explains which aspects...
Summary
Vulnerability reported (CVE-2026-42495). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
[This CNA information record relates to multiple CVEs; the
text explains which aspects/vulnerabilities correspond to which CVE.]
The directory and Rock Ridge / SUSP walk in libfsimage's iso9660 driver
derives several lengths directly from attacker-controlled on-disk fields
without validating them:
-
The directory loop itself assumes a good record length. This is
CVE-2026-42494. -
The calculation of the System Use area may underflow. This is
CVE-2026-42495. -
The Rock Ridge extension loop assumes a good (inner) record length.
This is CVE-2026-62423. -
The Rock Ridge NM record processing assumes a good entry length.
This is CVE-2026-62424. -
The Rock Ridge CE record processing assumes a good size and offset.
This is CVE-2026-62425.
Source: GitHub Security Advisories (Global) NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-42495 has been found.
Risk of unauthorized operations or information disclosure. CVSS score: 5.5/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "CVE-2026-42495" on the vendor's site.
CVE-2026-42495 — CWE-191 / CVSS v3 5.5
Attack vector: local / unauthenticated
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-191) has been reported.
Check the vendor advisory for the affected versions.
Severity: Medium (CVSS 5.5/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで影響コンポーネントを特定する。
-
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Alpine Linux ALPINE-CVE-2026-42495 xen Fixed in: 4.19.6-r0
- Ubuntu UBUNTU-CVE-2026-42495 xen
References
- web nvd.nist.gov
- web xenbits.xenproject.org
- web github.com