Glib: buffer over-read in glib/giochannel.c via "g_io_channel_read_line_backend"

Description

A flaw was found in GLib. A buffer over-read can occur in g_io_channel_read_line_backend() in the giochannel.c file when a custom line terminator with a length greater than one is set, causing memcmp to read past the GString buffer. This vulnerability can cause a minor information disclosure of 7 bytes or a denial of service when the buffer over-read crosses a page boundary.

Timeline

Scores

EPSS (exploitation in 30 days)

0.71% · top 46% of all CVEs (11 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 6.5.

Affected products

• GNOME · GLib

  • affected < 2.88.1

• Red Hat · Red Hat Enterprise Linux 10

  • unaffected 0:2.80.4-12.el10_2.21 – < *

• Red Hat · Red Hat Enterprise Linux 10

  • unaffected 0:2.89.2-1.el10 – < *

• Red Hat · Red Hat Enterprise Linux 10.0 Extended Update Support

  • unaffected 0:2.80.4-4.el10_0.17 – < *

• Red Hat · Red Hat Enterprise Linux 7 Extended Lifecycle Support

  • unaffected 0:2.56.1-13.el7_9.1 – < *

• Red Hat · Red Hat Enterprise Linux 8

  • unaffected 0:2.70.1-9.el8_10 – < *

• Red Hat · Red Hat Enterprise Linux 8

  • unaffected 0:2.56.4-177.el8_10 – < *

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

  • unaffected 0:2.56.4-10.el8_4.7 – < *

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

  • unaffected 0:2.56.4-10.el8_4.7 – < *

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

  • unaffected 0:2.56.4-158.el8_6.7 – < *

• Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

  • unaffected 0:2.56.4-158.el8_6.7 – < *

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

  • unaffected 0:2.56.4-165.el8_8.2 – < *

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

  • unaffected 0:2.56.4-165.el8_8.2 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:2.68.4-19.el9_8.9 – < *

• Red Hat · Red Hat Enterprise Linux 9

  • unaffected 0:2.68.4-19.el9_8.9 – < *

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

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

• Red Hat · Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

  • unaffected 0:2.68.4-14.el9_4.8 – < *

• Red Hat · Red Hat Enterprise Linux 9.6 Extended Update Support

  • unaffected 0:2.68.4-16.el9_6.7 – < *

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

  • unaffected 1791371080 – < *

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

  • unaffected 1791371069 – < *

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

  • unaffected 1791788287 – < *

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

  • unaffected 1791378395 – < *

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

  • unaffected 1791970484 – < *

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

  • unaffected 1791459707 – < *

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

  • unaffected 1791459711 – < *

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

  • unaffected 1791459759 – < *

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

  • unaffected 1789029076 – < *

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

  • unaffected 1791966259 – < *

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

  • unaffected 1788348522 – < *

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

  • unaffected 1788348571 – < *

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

  • unaffected 1788348571 – < *

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

  • unaffected 1788348594 – < *

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

  • unaffected 1790223279 – < *

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

  • unaffected 1790223719 – < *

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

  • unaffected 1790272426 – < *

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

  • unaffected 1790589998 – < *

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

  • unaffected 1790589912 – < *

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

  • unaffected 1790589914 – < *

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

  • unaffected 1790589855 – < *

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

  • unaffected 1790598593 – < *

• Red Hat · Red Hat AI Inference Server 3.2

  • unaffected 1790621714 – < *

• Red Hat · Red Hat AI Inference Server 3.2

  • unaffected 1790621718 – < *

• Red Hat · Red Hat AI Inference Server 3.2

  • unaffected 1790621713 – < *

• Red Hat · Red Hat AI Inference Server 3.5

  • unaffected 1791425869 – < *

• Red Hat · Red Hat AI Inference Server 3.5

  • unaffected 1791427182 – < *

• Red Hat · Red Hat AI Inference Server 3.5

  • unaffected 1791803821 – < *

• Red Hat · Red Hat AI Inference Server 3.5

  • unaffected 1791473631 – < *

• Red Hat · Red Hat AI Inference Server 3.5

  • unaffected 1791818357 – < *

• Red Hat · Red Hat AI Inference Server 3.5

  • unaffected 1791473614 – < *

• Red Hat · Red Hat Discovery 2

  • unaffected 1788205779 – < *

• Red Hat · Red Hat Discovery 2

  • unaffected 1788206196 – < *

• Red Hat · Red Hat Enterprise Linux AI 3.5

  • unaffected 1793206758 – < *

• Red Hat · Red Hat Enterprise Linux AI 3.5

  • unaffected 1793194817 – < *

• Red Hat · Red Hat Enterprise Linux AI 3.5

  • unaffected 1793194815 – < *

• Red Hat · Red Hat Enterprise Linux AI 3.5

  • unaffected 1793194834 – < *

• Red Hat · Red Hat Enterprise Linux AI 3.5

  • unaffected 1793135861 – < *

• Red Hat · Red Hat Enterprise Linux AI 3.5

  • unaffected 1793194815 – < *

• Red Hat · Red Hat Enterprise Linux AI 3.5

  • unaffected 1793135863 – < *

• Red Hat · Red Hat OpenShift AI 3.0

  • unaffected 1790276886 – < *

• Red Hat · Red Hat OpenShift AI 3.0

  • unaffected 1790276884 – < *

• Red Hat · Red Hat OpenShift AI 3.0

  • unaffected 1790277045 – < *

• Red Hat · Red Hat OpenShift AI 3.0

  • unaffected 1790276889 – < *

• Red Hat · Red Hat OpenShift AI 3.0

  • unaffected 1790276974 – < *

• Red Hat · Red Hat OpenShift AI 3.2

  • unaffected 1790703497 – < *

• Red Hat · Red Hat OpenShift AI 3.2

  • unaffected 1790703506 – < *

• Red Hat · Red Hat OpenShift AI 3.2

  • unaffected 1790703590 – < *

• Red Hat · Red Hat OpenShift AI 3.2

  • unaffected 1790703568 – < *

• Red Hat · Red Hat OpenShift AI 3.2

  • unaffected 1790703586 – < *

• Red Hat · Red Hat OpenShift AI 3.2

  • unaffected 1790703494 – < *

• Red Hat · Red Hat OpenShift AI 3.4

  • unaffected 1790703542 – < *

• Red Hat · Red Hat OpenShift AI 3.4

  • unaffected 1790703539 – < *

• Red Hat · Red Hat OpenShift AI 3.4

  • unaffected 1790703553 – < *

• Red Hat · Red Hat OpenShift AI 3.4

  • unaffected 1790703631 – < *

• Red Hat · Red Hat OpenShift AI 3.4

  • unaffected 1790703597 – < *

• Red Hat · Red Hat OpenShift AI 3.4

  • unaffected 1790703641 – < *

• Red Hat · Red Hat OpenShift AI 3.4

  • unaffected 1790703630 – < *

• Red Hat · Red Hat OpenShift AI 3.4

  • unaffected 1790703541 – < *

• Red Hat · Red Hat OpenShift AI 3.4

  • unaffected 1790703545 – < *

• Red Hat · Red Hat OpenShift AI 3.4

  • unaffected 1791231926 – < *

• Red Hat · Red Hat OpenShift AI 3.4

  • unaffected 1791232048 – < *

• Red Hat · Red Hat OpenShift AI 3.5

  • unaffected 1790703552 – < *

• Red Hat · Red Hat OpenShift AI 3.5

  • unaffected 1790703656 – < *

• Red Hat · Red Hat OpenShift AI 3.5

  • unaffected 1790703557 – < *

• Red Hat · Red Hat OpenShift AI 3.5

  • unaffected 1790703707 – < *

• Red Hat · Red Hat OpenShift AI 3.5

  • unaffected 1790703645 – < *

• Red Hat · Red Hat OpenShift AI 3.5

  • unaffected 1790703554 – < *

• Red Hat · Red Hat OpenShift AI 3.5

  • unaffected 1790703554 – < *

• Red Hat · Red Hat OpenShift AI 3.5

  • unaffected 1790703630 – < *

• Red Hat · Red Hat OpenShift AI 3.5

  • unaffected 1790703706 – < *

• Red Hat · Red Hat Update Infrastructure 5

  • unaffected 1787241211 – < *

• Red Hat · Red Hat Update Infrastructure 5

  • unaffected 1787135742 – < *

• Red Hat · Red Hat Update Infrastructure 5

  • unaffected 1787241260 – < *

• Red Hat · Red Hat Update Infrastructure 5

  • unaffected 1788880445 – < *

• Red Hat · Red Hat Update Infrastructure 5

  • unaffected 1788880464 – < *

• Red Hat · Red Hat Update Infrastructure 5

  • unaffected 1788880456 – < *

• Red Hat · Red Hat Update Infrastructure 5

  • unaffected 1788765051 – < *

• Red Hat · Red Hat Update Infrastructure 5

  • unaffected 1788880581 – < *

• Red Hat · Red Hat Enterprise Linux 6

  All versions: affected

• Red Hat · Red Hat Enterprise Linux 9

  All versions: affected

• Red Hat · Red Hat Hardened Images

  All versions: unaffected

• Red Hat · Red Hat OpenShift AI (RHOAI)

  All versions: unaffected

What to do

Workaround: To mitigate this vulnerability, restrict any custom line terminator string passed to g_io_channel_set_line_term() to a maximum length of one byte before calling g_io_channel_read_line_backend(). Using the default line terminators will completely neutralize this issue.

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-2026-40315 (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-2026-58013](https://cveledger.app/badge/CVE-2026-58013.svg)](https://cveledger.app/cve/CVE-2026-58013)

Record last updated 10 Nov 2026, 19:23 UTC.