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

Description

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.

Timeline

Scores

EPSS (exploitation in 30 days)

0.65% · top 48% of all CVEs (14 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.8.

Affected products

• glib

  • affected < 2.84.2

• Red Hat · Red Hat Enterprise Linux 10

  • unaffected 0:2.80.4-4.el10_0.6 – < *

• Red Hat · Red Hat Enterprise Linux 8

  • unaffected 0:2.56.4-166.el8_10 – < *

• Red Hat · Red Hat Enterprise Linux 8.2 Advanced Update Support

  • unaffected 0:2.56.4-8.el8_2.2 – < *

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

  • unaffected 0:2.56.4-10.el8_4.2 – < *

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

  • unaffected 0:2.56.4-10.el8_4.2 – < *

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

  • unaffected 0:2.56.4-158.el8_6.2 – < *

• Red Hat · Red Hat Enterprise Linux 8.6 Telecommunications Update Service

  • unaffected 0:2.56.4-158.el8_6.2 – < *

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

  • unaffected 0:2.56.4-158.el8_6.2 – < *

• Red Hat · Red Hat Enterprise Linux 8.8 Telecommunications Update Service

  • unaffected 0:2.56.4-162.el8_8 – < *

• Red Hat · Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions

  • unaffected 0:2.56.4-162.el8_8 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:2.68.4-16.el9_6.2 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:2.68.4-16.el9_6.2 – < *

• Red Hat · Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions

  • unaffected 0:2.68.4-5.el9_0.2 – < *

• Red Hat · Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

  • unaffected 0:2.68.4-7.el9_2.2 – < *

• Red Hat · Red Hat Enterprise Linux 9.4 Extended Update Support

  • unaffected 0:2.68.4-14.el9_4.3 – < *

• Red Hat · Red Hat Insights proxy 1.5

  • unaffected 1.5.5-1754504343 – < *

• Red Hat · Red Hat OpenShift distributed tracing 3.6.0

  • unaffected rhosdt-3.6-1753265330 – < *

• Red Hat · Red Hat OpenShift distributed tracing 3.6.0

  • unaffected rhosdt-3.6-1753265394 – < *

• Red Hat · Red Hat OpenShift distributed tracing 3.6.0

  • unaffected rhosdt-3.6-1753265332 – < *

• Red Hat · Red Hat OpenShift distributed tracing 3.6.0

  • unaffected rhosdt-3.6-1753265435 – < *

• Red Hat · Red Hat OpenShift distributed tracing 3.6.0

  • unaffected rhosdt-3.6-1753265342 – < *

• Red Hat · Red Hat OpenShift distributed tracing 3.6.0

  • unaffected rhosdt-3.6-1753265332 – < *

• Red Hat · Red Hat OpenShift distributed tracing 3.6.0

  • unaffected rhosdt-3.6-1753269432 – < *

• Red Hat · Red Hat OpenShift distributed tracing 3.6.0

  • unaffected rhosdt-3.6-1753265411 – < *

• Red Hat · Red Hat OpenShift distributed tracing 3.6.0

  • unaffected rhosdt-3.6-1753265314 – < *

• Red Hat · Red Hat Enterprise Linux 10

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 10

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 10

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 10

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 6

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 7

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 8

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 8

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 9

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 9

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 9

  All versions: affected

What to do

Workaround: Currently, no mitigation is available for this vulnerability.

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• EUVD EUVD-2025-13592 (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2025-4373](https://cveledger.app/badge/CVE-2025-4373.svg)](https://cveledger.app/cve/CVE-2025-4373)

Record last updated 5 Nov 2026, 15:46 UTC.