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Back to active CVEs
High · CVSS 8.1CVE-2026-16487

Bootc: containers-common: bootc: automatic updates can apply unsigned mutable-tag content under default containers policyCVE-2026-16487

Answer in brief

CVE-2026-16487 records a High severity (CVSS 8.1) vulnerability in Bootc: containers-common: bootc: automatic updates can apply unsigned mutable-tag content under default containers policy. The current sources do not mark it as known exploited. The current feed maps Red Hat/bootc (generic), Red Hat/containers-common (generic), Red Hat/container-tools:rhel8/containers-common (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 19, 2026Updated Oct 19, 2026Source checked Oct 19, 2026First seen by HOL Oct 19, 2026Material review Oct 19, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.1
Exploitation
Not marked as known exploited
Affected software
3 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 8.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/bootc (generic), Red Hat/containers-common (generic), Red Hat/container-tools:rhel8/containers-common (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/bootcgeneric*Not reported
Red Hat/containers-commongeneric*Not reported
Red Hat/container-tools:rhel8/containers-commongeneric*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/bootc, Red Hat/containers-common, Red Hat/container-tools:rhel8/containers-common.
  2. 2Review the reported fix. Source-reported workaround: Pin bootc updates to image digests, or configure /etc/containers/policy.json to reject unsigned content by default and allow only explicitly trusted signed scopes. Until policy is hardened, disable automatic updates (bootc-fetch-apply-updates.timer). After a suspected malicious image, do not rely on bootc rollback alone: audit and remediate persistent /var (including /var/roothome), then re-enroll to a trusted signed image.

Evidence timeline and material changes

  1. Published upstream

    Oct 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 19, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

A flaw was found in bootc when operating with the default containers signature policy. Automatic or manual upgrades of a mutable image tag may apply unsigned content for registries that fall through to insecureAcceptAnything, allowing an attacker who can update that tag to execute arbitrary OS content as the host root filesystem on reboot.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Bootc: ostree: bootc/ostree: staged deployments not revalidated against container signature policy before finalizationSame red hat/bootc package
  • Coinbase Commerce Payment Gateway for WooCommerce <= 1.4.1 - Unauthenticated Webhook Signature Bypass via Empty-Default Webhook Shared SecretAlso CWE-345
  • Document Gallery 4.1 - 5.1.1 - Unauthenticated Document Thumbnail Replacement via Thumber Webhook Signature BypassAlso CWE-345
  • iPOSpays Payment Gateway for WooCommerce < 1.4.7 - Unauthenticated Payment Confirmation ForgeryAlso CWE-345

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
CWE-345
Source
CVE List V5
Source checked
Oct 19, 2026
References
2 linked sources
Open source record