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NVD / CVE Program· CNA redhat

CVE-2026-15588: Gdbusserver: glib2: gdbusserver pre-authentication dos via unbounded sasl line buffering

Noroxi assessment

Priority: Monitor (action score 21/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.57% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: azl3 glib 2.78.6-11 on Azure Linux 3.0 2.78.6-11.

Low priority for now. Upgrade to azl3 glib 2.78.6-11 on Azure Linux 3.0 2.78.6-11 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.3 · v3.1—No exploit Fix available
Published
Jul 20, 2026
Updated
Nov 6, 2026
EPSS
0.5% · 47th percentile

Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
21 / 40 · 5.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
5.3
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-15588

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17

    • 1791371080 and laternot affected · rpm
    • 1791371069 and laternot affected · rpm
    • 1791788287 and laternot affected · rpm
    • 1791378395 and laternot affected · rpm
    • 1791970484 and laternot affected · rpm

  • Red Hat Cert Manager support for Red Hat OpenShift release 1.18

    • 1791459707 and laternot affected · rpm
    • 1791459711 and laternot affected · rpm
    • 1791459759 and laternot affected · rpm
    • 1789029076 and laternot affected · rpm
    • 1791966259 and laternot affected · rpm

  • Red Hat Cert Manager support for Red Hat OpenShift release 1.19

    • 1788348522 and laternot affected · rpm
    • 1788348571 and laternot affected · rpm
    • 1788348571 and laternot affected · rpm
    • 1788348594 and laternot affected · rpm

  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20

    • 1790223279 and laternot affected · rpm
    • 1790223719 and laternot affected · rpm
    • 1790272426 and laternot affected · rpm
    • 1790589998 and laternot affected · rpm
    • 1790589912 and laternot affected · rpm
    • 1790589914 and laternot affected · rpm
    • 1790589855 and laternot affected · rpm
    • 1790598593 and laternot affected · rpm

  • Red Hat Red Hat AI Inference Server 3.2

    • 1790621714 and laternot affected · rpm
    • 1790621718 and laternot affected · rpm
    • 1790621713 and laternot affected · rpm

  • Red Hat Red Hat AI Inference Server 3.5

    • 1791425869 and laternot affected · rpm
    • 1791427182 and laternot affected · rpm
    • 1791803821 and laternot affected · rpm
    • 1791473631 and laternot affected · rpm
    • 1791818357 and laternot affected · rpm
    • 1791473614 and laternot affected · rpm

  • Red Hat Red Hat Discovery 2

    • 1788205779 and laternot affected · rpm
    • 1788206196 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 10

    • 0:2.80.4-12.el10_2.21 and laternot affected · rpm
    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support

    • 0:2.80.4-4.el10_0.17 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support

    • 0:2.56.1-13.el7_9.1 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8

    • 0:2.56.4-177.el8_10 and laternot affected · rpm
    • all versionsaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10glib2before 2.80.4-12.el10_2.212.80.4-12.el10_2.21
AlmaLinux:10glib2-develbefore 2.80.4-12.el10_2.212.80.4-12.el10_2.21
AlmaLinux:10glib2-docbefore 2.80.4-12.el10_2.212.80.4-12.el10_2.21
AlmaLinux:10glib2-staticbefore 2.80.4-12.el10_2.212.80.4-12.el10_2.21
AlmaLinux:10glib2-testsbefore 2.80.4-12.el10_2.212.80.4-12.el10_2.21
AlmaLinux:8glib2before 2.56.4-177.el8_102.56.4-177.el8_10
AlmaLinux:8glib2-develbefore 2.56.4-177.el8_102.56.4-177.el8_10
AlmaLinux:8glib2-docbefore 2.56.4-177.el8_102.56.4-177.el8_10
AlmaLinux:8glib2-fambefore 2.56.4-177.el8_102.56.4-177.el8_10
AlmaLinux:8glib2-staticbefore 2.56.4-177.el8_102.56.4-177.el8_10
AlmaLinux:8glib2-testsbefore 2.56.4-177.el8_102.56.4-177.el8_10
AlmaLinux:9glib2before 2.68.4-19.el9_8.92.68.4-19.el9_8.9
AlmaLinux:9glib2-develbefore 2.68.4-19.el9_8.92.68.4-19.el9_8.9
AlmaLinux:9glib2-docbefore 2.68.4-19.el9_8.92.68.4-19.el9_8.9
AlmaLinux:9glib2-staticbefore 2.68.4-19.el9_8.92.68.4-19.el9_8.9
AlmaLinux:9glib2-testsbefore 2.68.4-19.el9_8.92.68.4-19.el9_8.9
Debian:12glib2.0from 0—
Debian:13glib2.0before 2.84.4-3~deb13u42.84.4-3~deb13u4
Debian:14glib2.0before 2.88.3-12.88.3-1
openSUSE:Leap 16.0glib2before 2.84.4-160000.5.12.84.4-160000.5.1
openSUSE:Leap 16.0glib2-docbefore 2.84.4-160000.5.12.84.4-160000.5.1
openSUSE:Tumbleweedglib2before 2.88.3-1.12.88.3-1.1
Red Hat:enterprise_linux_eus:10.0glib2before 0:2.80.4-4.el10_0.170:2.80.4-4.el10_0.17
Red Hat:enterprise_linux_eus:10.0glib2-debuginfobefore 0:2.80.4-4.el10_0.170:2.80.4-4.el10_0.17

+96

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-10230Samba: command injection in wins server hook script
    52Plan
  • CVE-2026-4631Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument injection
    44Plan
  • CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-3842Jul 15, 2026 · Qemu-kvm: hyperv/syndbg: missing mapped-length guard after cpu_physical_memory_map causes host oob write
    31Monitor
  • ← EarlierCVE-2026-5674Jul 16, 2026 · Pipewire: pipewire: sandbox escape and arbitrary code execution via malicious library loading
    35Monitor
  • Later →CVE-2026-15813Jul 20, 2026 · Kronosnet: kronosnet: memory corruption and out-of-bounds access via malformed network packet defragmentation
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
azl3 glib 2.78.6-11 on Azure Linux 3.02.78.6-11 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:glib22.68.4-19.el9_8.9 · AlmaLinux:9Package registry (OSV)
almalinux:glib2-devel2.68.4-19.el9_8.9 · AlmaLinux:9Package registry (OSV)
almalinux:glib2-doc2.68.4-19.el9_8.9 · AlmaLinux:9Package registry (OSV)
almalinux:glib2-fam2.56.4-177.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:glib2-static2.68.4-19.el9_8.9 · AlmaLinux:9Package registry (OSV)
almalinux:glib2-tests2.68.4-19.el9_8.9 · AlmaLinux:9Package registry (OSV)
debian:glib2.02.84.4-3~deb13u4 · Debian:13Package registry (OSV)
opensuse:glib22.88.3-1.1 · openSUSE:TumbleweedPackage registry (OSV)
opensuse:glib2-doc2.84.4-160000.5.1 · openSUSE:Leap 16.0Package registry (OSV)
red hat:glib20:2.89.1-1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:glib2-debuginfo0:2.68.4-19.el9_8.9 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:glib2-debugsource0:2.68.4-19.el9_8.9 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:glib2-devel0:2.68.4-19.el9_8.9 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:glib2-devel0:2.89.1-1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:glib2-devel-debuginfo0:2.68.4-19.el9_8.9 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:glib2-doc0:2.68.4-19.el9_8.9 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:glib2-doc0:2.89.1-1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:glib2-fam0:2.56.4-177.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:glib2-fam-debuginfo0:2.56.4-177.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:glib2-static0:2.68.4-19.el9_8.9 · Red Hat:enterprise_linux:9::crbPackage registry (OSV)
red hat:glib2-static0:2.89.1-1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:glib2-tests0:2.68.4-19.el9_8.9 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:glib2-tests0:2.89.1-1.1.hum1 · Red Hat:hummingbird:1Package registry (OSV)
red hat:glib2-tests-debuginfo0:2.68.4-19.el9_8.9 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
rocky linux:glib20:2.68.4-19.el9_8.9 · Rocky Linux:9Package registry (OSV)
suse:glib22.76.2-14.1 · SUSE:Linux Micro 6.0Package registry (OSV)
suse:glib2-doc2.84.4-160000.5.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-157116 days apartLibsoup: soupwebsocketconnection: libsoup: websocket remote denial of service via oversized control frame protocol violation
    30Monitor
  • CVE-2026-1864917 days apartGstreamer1-plugins-good: gst-plugins-good: unbounded memory growth in rtph264depay and rtph265depay rtp depayloaders
    30Monitor
  • CVE-2026-9114960 days apartCockpit: cockpit: denial of service via unbounded connection thread spawning
    30Monitor
  • CVE-2025-32049473 days apartLibsoup: denial of service attack to websocket server
    30Monitor
  • CVE-2026-8523188 days apartLibtirpc: libtirpc: denial of service via unbounded memory allocation during rpcsec_gss decoding
    26Monitor
  • CVE-2026-10404178 days apartSssd: sssd: denial of service via unbounded negative cache growth
    22Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
low · data or configuration can be modified
Availability
low · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
Low
Availability impact
Low

Weakness class (CWE)

CWE-770 · Allocation of Resources Without Limits or Throttling

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Change log

  1. Fix✗ → ✓
  2. SSVC exploitation— → poc

For records you follow, these changes also arrive as notifications. →

References

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records