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MEDIUM

CVE-2026-15588

CVSS v3

5.3

MEDIUM

EPSS Score

0.5 %

exploit probability, as of 2026-10-17

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • glib2AlmaLinux:10all versions · fixed in 2.80.4-12.el10_2.21and 4 other packages
  • glib2AlmaLinux:9all versions · fixed in 2.68.4-19.el9_8.9and 4 other packages
  • glib2AlmaLinux:8all versions · fixed in 2.56.4-177.el8_10and 5 other packages

Vendor advisories

  • CVE-2026-15588 Red Hat Product Security841 products fixed · 22 known affected

    GDBusServer: glib2: GDBusServer pre-authentication DoS via unbounded SASL line buffering

    mingw-glib2.src as a component of Red Hat Enterprise Linux 10 · mingw32-glib2 as a component of Red Hat Enterprise Linux 10 · mingw32-glib2-static as a component of Red Hat Enterprise Linux 10

  • RHSA-2026:82888 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.17.2

  • RHSA-2026:82857 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: cert-manager Operator for Red Hat OpenShift 1.18.2

  • RHSA-2026:82415 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat AI Inference 3.5.2 (cpu)

  • RHSA-2026:82371 Red Hat Product Security3 products fixed

    Red Hat Security Advisory: Red Hat AI Inference 3.5.2 (spyre)

  • RHSA-2026:82368 Red Hat Product Security2 products fixed

    Red Hat Security Advisory: Red Hat AI Inference 3.5.2 (cuda)

67 more advisories

Full record on NVD

Description

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.

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Published
2026-07-20
Last Modified
2026-07-21

Frequently asked questions

What is CVE-2026-15588?

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.

Is CVE-2026-15588 actively exploited?

Active exploitation of CVE-2026-15588 has not been confirmed. Its EPSS score was 0.5% on 2026-10-17, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-15588?

CVE-2026-15588 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L.

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