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CVE Record

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

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 4.8Not KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

GLib contains an integer-overflow flaw that can make software write before its intended memory buffer. A successful trigger could corrupt data or crash the affected process, but the supplied CVSS assessment indicates high attack complexity, low integrity and availability impact, and no confidentiality impact.

Executive priority

Treat this as a normal-priority patching item, accelerated for exposed or business-critical services. The moderate score and high complexity reduce immediate urgency, but widespread GLib use can increase operational exposure. Do not defer indefinitely because successful triggering may corrupt memory or interrupt services.

Technical view

CVE-2025-4373 affects g_string_insert_unichar() in GLib. A sufficiently large insertion position can overflow, causing a buffer underwrite classified as CWE-124. The supplied CVSS 3.1 score is 4.8: network-reachable, high complexity, no privileges or user interaction, with low integrity and availability impact.

Likely exposure

Exposure exists where affected GLib or Red Hat glib2 packages process input that can reach the vulnerable function with a large insertion position. The bundle identifies affected RHEL 8, 9, and 10 packages, selected lifecycle variants, Insights proxy 1.5, and OpenShift distributed tracing 3.6.0 containers.

Exploitation context

The bundle marks this CVE as absent from KEV and provides no evidence of active exploitation. Network reachability is reflected in the CVSS vector, but exploitation requires high complexity. Actual reachability depends on how applications invoke the affected GLib function; the supplied sources do not establish universal remote exposure.

Researcher notes

The bundle identifies an integer overflow resulting in a buffer underwrite, but does not provide a complete upstream affected-version range or demonstrate code-path reachability in specific applications. The generic glib entry is ambiguous, while Red Hat package and container entries are explicit. No exploit status beyond KEV absence is established.

Mitigation direction

  • Apply the relevant Red Hat security errata or vendor-provided package updates for each affected platform.
  • Prioritize internet-facing services that use affected GLib or glib2 packages.
  • Rebuild or redeploy affected container images using vendor-updated base packages.
  • Check GNOME, Red Hat, or other relevant vendor guidance for product-specific remediation.

Validation and detection

  • Inventory installed GLib and glib2 package versions across hosts and container images.
  • Compare discovered versions and product streams with the affected entries and applicable Red Hat errata.
  • Identify applications that call g_string_insert_unichar() with externally influenced positions.
  • Confirm updated packages are active after remediation, including restarted services and rebuilt containers.
  • Monitor affected processes for crashes or memory-corruption indicators while remediation is pending.
Prepared
Confidence
medium
Sources
12

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · low confidence lookup

CWE-124: Exact CWE lookup

Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
description · low confidence lookup

Container behavior lookup

The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2025-4373 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
4.8 (3.1)
Known Exploited
No
Published

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

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

1CVSS vectors
5Timeline events
2ADP providers
18Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
4.8CVSS 3.1MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L2.22.5redhat

Vulnerability scoring details

Base CVSS 3.1 score

4.8Medium
CVSS 3.1 vector shape for CVE-2025-4373Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

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

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. Source timelineredhat

    Made public.

  2. Source timelineredhat

    Reported to Red Hat.

  3. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  4. CVE publishedCVE Program

    The CVE record was published.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
siemens-SADPADP container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
Unknown vendorglibglib, 0unaffected
Red HatRed Hat Enterprise Linux 10glib2, 0:2.80.4-4.el10_0.6affected
Red HatRed Hat Enterprise Linux 8glib2, 0:2.56.4-166.el8_10affected
Red HatRed Hat Enterprise Linux 8.2 Advanced Update Supportglib2, 0:2.56.4-8.el8_2.2affected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Supportglib2, 0:2.56.4-10.el8_4.2affected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-Onglib2, 0:2.56.4-10.el8_4.2affected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Supportglib2, 0:2.56.4-158.el8_6.2affected
Red HatRed Hat Enterprise Linux 8.6 Telecommunications Update Serviceglib2, 0:2.56.4-158.el8_6.2affected
Red HatRed Hat Enterprise Linux 8.6 Update Services for SAP Solutionsglib2, 0:2.56.4-158.el8_6.2affected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Serviceglib2, 0:2.56.4-162.el8_8affected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutionsglib2, 0:2.56.4-162.el8_8affected
Red HatRed Hat Enterprise Linux 9glib2, 0:2.68.4-16.el9_6.2affected
Red HatRed Hat Enterprise Linux 9glib2, 0:2.68.4-16.el9_6.2affected
Red HatRed Hat Enterprise Linux 9.0 Update Services for SAP Solutionsglib2, 0:2.68.4-5.el9_0.2affected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutionsglib2, 0:2.68.4-7.el9_2.2affected
Red HatRed Hat Enterprise Linux 9.4 Extended Update Supportglib2, 0:2.68.4-14.el9_4.3affected
Red HatRed Hat Insights proxy 1.5insights-proxy/insights-proxy-container-rhel9, 1.5.5-1754504343affected
Red HatRed Hat OpenShift distributed tracing 3.6.0rhosdt/jaeger-agent-rhel8, rhosdt-3.6-1753265330affected
Red HatRed Hat OpenShift distributed tracing 3.6.0rhosdt/jaeger-all-in-one-rhel8, rhosdt-3.6-1753265394affected
Red HatRed Hat OpenShift distributed tracing 3.6.0rhosdt/jaeger-collector-rhel8, rhosdt-3.6-1753265332affected
Red HatRed Hat OpenShift distributed tracing 3.6.0rhosdt/jaeger-es-index-cleaner-rhel8, rhosdt-3.6-1753265435affected
Red HatRed Hat OpenShift distributed tracing 3.6.0rhosdt/jaeger-es-rollover-rhel8, rhosdt-3.6-1753265342affected
Red HatRed Hat OpenShift distributed tracing 3.6.0rhosdt/jaeger-ingester-rhel8, rhosdt-3.6-1753265332affected
Red HatRed Hat OpenShift distributed tracing 3.6.0rhosdt/jaeger-operator-bundle, rhosdt-3.6-1753269432affected
Red HatRed Hat OpenShift distributed tracing 3.6.0rhosdt/jaeger-query-rhel8, rhosdt-3.6-1753265411affected
Red HatRed Hat OpenShift distributed tracing 3.6.0rhosdt/jaeger-rhel8-operator, rhosdt-3.6-1753265314affected
Red HatRed Hat Enterprise Linux 10bootcaffected
Red HatRed Hat Enterprise Linux 10glycin-loadersaffected
Red HatRed Hat Enterprise Linux 10loupeaffected
Red HatRed Hat Enterprise Linux 10mingw-glib2affected
Weakness

CWE details

CWE-124

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-124 · source CWE mapping

Buffer Underwrite ('Buffer Underflow')

Buffer Underwrite ('Buffer Underflow') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs