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CVE-2026-15588 Red Hat CVE debrief

A denial-of-service and resource exhaustion vulnerability exists within the `GDBus` component of GLib. The `gdbusauth` authentication mechanism fails to enforce proper length limitations on data lines read from a client. An unauthenticated local or remote attacker can exploit this lack of input validation by sending excessively long streams of data, causing the application to consume massive amounts of system memory and CPU, potentially leading to a crash or system hang.

Vendor
Red Hat
Product
Red Hat Hardened Images
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-20
Original CVE updated
2026-09-01
Advisory published
2026-07-20
Advisory updated
2026-09-01

Who should care

Users and administrators of systems that utilize GLib and its GDBus component should be aware of this vulnerability. This includes but is not limited to Linux distributions, as GLib is a fundamental library used in various applications and services.

Technical summary

The vulnerability is located in the `GDBus` component of GLib, specifically in the `gdbusauth` authentication mechanism. This mechanism does not properly enforce length limitations on data lines read from a client. An attacker can exploit this by sending long streams of data, leading to high memory and CPU consumption, potentially causing a crash or system hang. Users and administrators should assess their exposure and prioritize patching based on the CVSS score of 5.3, indicating moderate severity. Affected systems include various Linux distributions and applications relying on GLib.

Defensive priority

Medium priority should be given to patching this vulnerability due to its potential for denial-of-service and resource exhaustion. The CVSS score of 5.3 indicates a moderate severity.

Recommended defensive actions

  • Apply patches or updates provided by the GLib maintainers or relevant Linux distributions.
  • Implement compensating controls such as monitoring for unusual system activity.
  • Consider temporarily disabling affected services until patches can be applied.
  • Review system logs for signs of exploitation attempts.
  • Perform a thorough inventory of assets that may be affected.
  • Establish a rollback plan in case patching causes unforeseen issues.
  • Track the status of remediation efforts and document evidence of completion.

Evidence notes

The CVE record was published on 2026-07-20T12:17:55.220Z and was last modified on 2026-07-21T18:31:51.680Z. The NVD entry is currently Awaiting Analysis. Multiple references are provided, including links to Red Hat errata and bugzilla entries.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-15588 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-15588

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-15588 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-15588

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.