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NVD / CVE Program· CNA redhat

CVE-2025-4373: Glib: buffer underflow on glib through glib/gstring.c via function g_string_insert_unichar

Noroxi assessment

Priority: Monitor (action score 19/100)

  • 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: 0.63% (FIRST EPSS); higher than 50.3% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: gitlab.gnome.org/GNOME/glib glib 2.84.2; azl3 glib 2.78.6-3 on Azure Linux 3.0 2.78.6-3; cbl2 glib 2.71.0-5 on CBL Mariner 2.0 2.71.0-6.

Low priority for now. Upgrade to gitlab.gnome.org/GNOME/glib glib 2.84.2; azl3 glib 2.78.6-3 on Azure Linux 3.0 2.78.6-3; cbl2 glib 2.71.0-5 on CBL Mariner 2.0 2.71.0-6 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 flaw was found in GLib, which is vulnerable to an integer overflow in the g_string_insert_unichar() function. When the position at which to insert the character is large, the position will overflow, leading to a buffer underwrite.

MediumCVSS 4.8 · v3.1—No exploit Fix available
Published
May 6, 2025
Updated
Oct 15, 2026
EPSS
0.6% · 50th percentile

Report tools

JSON

Action score

19

Monitor

Low priority for now.

CVSS
19 / 40 · 4.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
4.8
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.

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  • 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.

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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.

  • gitlab.gnome.org/GNOME/glib glib

    • before 2.84.2affected · semver

  • Red Hat Red Hat Enterprise Linux 10

    • 0:2.80.4-4.el10_0.6 and laternot affected · rpm
    • all versionsaffected
    • all versionsaffected
    • all versionsaffected
    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 8

    • 0:2.56.4-166.el8_10 and laternot affected · rpm
    • all versionsaffected
    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support

    • 0:2.56.4-8.el8_2.2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support

    • 0:2.56.4-10.el8_4.2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

    • 0:2.56.4-10.el8_4.2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support

    • 0:2.56.4-158.el8_6.2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Telecommunications Update Service

    • 0:2.56.4-158.el8_6.2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions

    • 0:2.56.4-158.el8_6.2 and laternot affected · rpm

  • Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service

    • 0:2.56.4-162.el8_8 and laternot affected · rpm

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8glib2before 2.56.4-166.el8_102.56.4-166.el8_10
AlmaLinux:8glib2-develbefore 2.56.4-166.el8_102.56.4-166.el8_10
AlmaLinux:8glib2-docbefore 2.56.4-166.el8_102.56.4-166.el8_10
AlmaLinux:8glib2-fambefore 2.56.4-166.el8_102.56.4-166.el8_10
AlmaLinux:8glib2-staticbefore 2.56.4-166.el8_102.56.4-166.el8_10
AlmaLinux:8glib2-testsbefore 2.56.4-166.el8_102.56.4-166.el8_10
AlmaLinux:9glib2before 2.68.4-16.el9_6.22.68.4-16.el9_6.2
AlmaLinux:9glib2-develbefore 2.68.4-16.el9_6.22.68.4-16.el9_6.2
AlmaLinux:9glib2-docbefore 2.68.4-16.el9_6.22.68.4-16.el9_6.2
AlmaLinux:9glib2-staticbefore 2.68.4-16.el9_6.22.68.4-16.el9_6.2
AlmaLinux:9glib2-testsbefore 2.68.4-16.el9_6.22.68.4-16.el9_6.2
Debian:11glib2.0before 2.66.8-1+deb11u72.66.8-1+deb11u7
Debian:12glib2.0before 2.74.6-2+deb12u72.74.6-2+deb12u7
Debian:13glib2.0before 2.84.1-32.84.1-3
openSUSE:Leap 15.6glib2before 2.78.6-150600.4.16.12.78.6-150600.4.16.1
openSUSE:Leap 15.6glib2-docbefore 2.78.6-150600.4.16.12.78.6-150600.4.16.1
Red Hat:enterprise_linux:10.0glib2before 0:2.80.4-4.el10_0.60:2.80.4-4.el10_0.6
Red Hat:enterprise_linux:10.0glib2-debuginfobefore 0:2.80.4-4.el10_0.60:2.80.4-4.el10_0.6
Red Hat:enterprise_linux:10.0glib2-debugsourcebefore 0:2.80.4-4.el10_0.60:2.80.4-4.el10_0.6
Red Hat:enterprise_linux:10.0glib2-develbefore 0:2.80.4-4.el10_0.60:2.80.4-4.el10_0.6
Red Hat:enterprise_linux:10.0glib2-devel-debuginfobefore 0:2.80.4-4.el10_0.60:2.80.4-4.el10_0.6
Red Hat:enterprise_linux:10.0glib2-docbefore 0:2.80.4-4.el10_0.60:2.80.4-4.el10_0.6
Red Hat:enterprise_linux:10.0glib2-staticbefore 0:2.80.4-4.el10_0.60:2.80.4-4.el10_0.6
Red Hat:enterprise_linux:10.0glib2-testsbefore 0:2.80.4-4.el10_0.60:2.80.4-4.el10_0.6

+91

Same product

red hat: all records

Other highest-scoring records for the same primary product.

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    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-2025-46421Apr 24, 2025 · Libsoup: information disclosure may leads libsoup client sends authorization header to a different host when being redirected by a server
    27Monitor
  • ← EarlierCVE-2025-4035Apr 29, 2025 · Libsoup: cookie domain validation bypass via uppercase characters in libsoup
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  • Later →CVE-2025-4382May 9, 2025 · Grub2: grub allow access to encrypted device through cli once root device is unlocked via tpm
    23Monitor

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
gitlab.gnome.org/GNOME/glib glib2.84.2Vendor (CNA)
azl3 glib 2.78.6-3 on Azure Linux 3.02.78.6-3 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 glib 2.71.0-5 on CBL Mariner 2.02.71.0-6 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 glib 2.71.0-6 on CBL Mariner 2.02.71.0-7 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 glib 2.71.0-7 on CBL Mariner 2.02.71.0-7 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 glib 2.71.0-7 on CBL-Mariner 2.02.71.0-7 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:glib22.68.4-16.el9_6.2 · AlmaLinux:9Package registry (OSV)
almalinux:glib2-devel2.68.4-16.el9_6.2 · AlmaLinux:9Package registry (OSV)
almalinux:glib2-doc2.68.4-16.el9_6.2 · AlmaLinux:9Package registry (OSV)
almalinux:glib2-fam2.56.4-166.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:glib2-static2.68.4-16.el9_6.2 · AlmaLinux:9Package registry (OSV)
almalinux:glib2-tests2.68.4-16.el9_6.2 · AlmaLinux:9Package registry (OSV)
debian:glib2.02.74.6-2+deb12u7 · Debian:12Package registry (OSV)
opensuse:glib22.78.6-150600.4.16.1 · openSUSE:Leap 15.6Package registry (OSV)
opensuse:glib2-doc2.78.6-150600.4.16.1 · openSUSE:Leap 15.6Package registry (OSV)
red hat:glib20:2.80.4-4.el10_0.6 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:glib2-debuginfo0:2.80.4-4.el10_0.6 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:glib2-debugsource0:2.80.4-4.el10_0.6 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:glib2-devel0:2.80.4-4.el10_0.6 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:glib2-devel-debuginfo0:2.80.4-4.el10_0.6 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:glib2-doc0:2.80.4-4.el10_0.6 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:glib2-fam0:2.56.4-166.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:glib2-fam-debuginfo0:2.56.4-166.el8_10 · Red Hat:enterprise_linux:8::baseosPackage registry (OSV)
red hat:glib2-static0:2.80.4-4.el10_0.6 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:glib2-tests0:2.80.4-4.el10_0.6 · Red Hat:enterprise_linux:10.0Package registry (OSV)
red hat:glib2-tests-debuginfo0:2.80.4-4.el10_0.6 · Red Hat:enterprise_linux:10.0Package registry (OSV)
rocky linux:glib20:2.80.4-4.el10_0.6 · Rocky Linux:10Package registry (OSV)
suse:glib22.62.6-150200.3.30.1 · SUSE:Linux Enterprise Micro 5.1Package registry (OSV)
suse:glib22.78.6-150600.4.16.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP6Package 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.

No history yet (it accumulates with the daily EPSS job).

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.

No credits in the CNA record.

Variant candidates

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

  • CVE-2026-1485266 days apartGlib: glib: local denial of service via buffer underflow in content type parsing
    11Monitor

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

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

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

Weakness class (CWE)

CWE-124 · Buffer Underwrite ('Buffer Underflow')

CVSS vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/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.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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

References

Show all references (16 more)

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

All records