CVE-2026-58012

Summary

A flaw was found in GLib. A buffer over-read can occur in the g_regex_replace function when used with the G_REGEX_RAW compile flag and case-change replacement escapes because the string_append function processes matched substrings using UTF-8 functions that assume valid UTF-8 input, even when the string is treated as raw bytes. This vulnerability can cause a minor information disclosure of 1-5 bytes and a denial of service when the buffer over-read crosses a page boundary.

Affected Software

VendorProductVersion RangeStatus
GNOMEGLib0 < 2.86.5affected
GNOMEGLib0 < 2.88.1affected
Red HatRed Hat Enterprise Linux 100:2.80.4-12.el10_2.21 < *unaffected
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support0:2.80.4-4.el10_0.17 < *unaffected
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Support0:2.56.1-13.el7_9.1 < *unaffected
Red HatRed Hat Enterprise Linux 80:2.70.1-9.el8_10 < *unaffected
Red HatRed Hat Enterprise Linux 80:2.56.4-177.el8_10 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support0:2.56.4-10.el8_4.7 < *unaffected
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On0:2.56.4-10.el8_4.7 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support0:2.56.4-158.el8_6.7 < *unaffected
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On0:2.56.4-158.el8_6.7 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service0:2.56.4-165.el8_8.2 < *unaffected
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions0:2.56.4-165.el8_8.2 < *unaffected
Red HatRed Hat Enterprise Linux 90:2.68.4-19.el9_8.9 < *unaffected
Red HatRed Hat Enterprise Linux 90:2.68.4-19.el9_8.9 < *unaffected
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions0:2.68.4-7.el9_2.7 < *unaffected
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions0:2.68.4-14.el9_4.8 < *unaffected
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support0:2.68.4-16.el9_6.7 < *unaffected
Red HatCert Manager support for Red Hat OpenShift release 1.191788348522 < *unaffected
Red HatCert Manager support for Red Hat OpenShift release 1.191788348571 < *unaffected
Red HatCert Manager support for Red Hat OpenShift release 1.191788348571 < *unaffected
Red HatCert Manager support for Red Hat OpenShift release 1.191788348594 < *unaffected
Red HatCert Manager support for Red Hat OpenShift release 1.201790223279 < *unaffected
Red HatCert Manager support for Red Hat OpenShift release 1.201790223719 < *unaffected
Red HatCert Manager support for Red Hat OpenShift release 1.201790272426 < *unaffected
Red HatCert Manager support for Red Hat OpenShift release 1.201790589998 < *unaffected
Red HatCert Manager support for Red Hat OpenShift release 1.201790589912 < *unaffected
Red HatCert Manager support for Red Hat OpenShift release 1.201790589914 < *unaffected
Red HatCert Manager support for Red Hat OpenShift release 1.201790589855 < *unaffected
Red HatCert Manager support for Red Hat OpenShift release 1.201790598593 < *unaffected
Red HatRed Hat AI Inference Server 3.21790621714 < *unaffected
Red HatRed Hat AI Inference Server 3.21790621718 < *unaffected
Red HatRed Hat AI Inference Server 3.21790621713 < *unaffected
Red HatRed Hat Discovery 21788205779 < *unaffected
Red HatRed Hat Discovery 21788206196 < *unaffected
Red HatRed Hat OpenShift AI 3.01790276886 < *unaffected
Red HatRed Hat OpenShift AI 3.01790276884 < *unaffected
Red HatRed Hat OpenShift AI 3.01790277045 < *unaffected
Red HatRed Hat OpenShift AI 3.01790276889 < *unaffected
Red HatRed Hat OpenShift AI 3.01790276974 < *unaffected
Red HatRed Hat OpenShift AI 3.21790703497 < *unaffected
Red HatRed Hat OpenShift AI 3.21790703506 < *unaffected
Red HatRed Hat OpenShift AI 3.21790703590 < *unaffected
Red HatRed Hat OpenShift AI 3.21790703568 < *unaffected
Red HatRed Hat OpenShift AI 3.21790703586 < *unaffected
Red HatRed Hat OpenShift AI 3.21790703494 < *unaffected
Red HatRed Hat OpenShift AI 3.41790703542 < *unaffected
Red HatRed Hat OpenShift AI 3.41790703539 < *unaffected
Red HatRed Hat OpenShift AI 3.41790703553 < *unaffected
Red HatRed Hat OpenShift AI 3.41790703631 < *unaffected
Red HatRed Hat OpenShift AI 3.41790703597 < *unaffected
Red HatRed Hat OpenShift AI 3.41790703641 < *unaffected
Red HatRed Hat OpenShift AI 3.41790703630 < *unaffected
Red HatRed Hat OpenShift AI 3.41790703541 < *unaffected
Red HatRed Hat OpenShift AI 3.41790703545 < *unaffected
Red HatRed Hat OpenShift AI 3.51790703552 < *unaffected
Red HatRed Hat Update Infrastructure 51787241211 < *unaffected
Red HatRed Hat Update Infrastructure 51787135742 < *unaffected
Red HatRed Hat Update Infrastructure 51787241260 < *unaffected
Red HatRed Hat Update Infrastructure 51788880445 < *unaffected
Red HatRed Hat Update Infrastructure 51788880464 < *unaffected
Red HatRed Hat Update Infrastructure 51788880456 < *unaffected
Red HatRed Hat Update Infrastructure 51788765051 < *unaffected
Red HatRed Hat Update Infrastructure 51788880581 < *unaffected

Weaknesses

  • CWE-126: Buffer Over-read

Workarounds

To mitigate this vulnerability, implement strict input validation to sanitize user-supplied replacement strings, specifically rejecting or escaping case-change modifiers (\u, \l, \U, \L) before calling g_regex_replace() or g_regex_replace_eval() when the G_REGEX_RAW compile flag is used. Removing the G_REGEX_RAW flag or hardcoding the replacement strings will completely neutralize this issue.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: yes
    • Technical Impact: partial

References