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CVE-2026-58012— Glib: buffer over-read in g_regex_replace() via glib/gregex.c:string_append() and g_utf8_next_char()

Quick assessment

Affected
GNOME GLib
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GNOME glib是GNOME基金会开源的一个通用的、可移植的实用程序库。提供了许多有用的数据类型、宏、类型转换、字符串实用程序、文件实用程序、主循环抽象等。 GNOME glib存在缓冲区错误漏洞，该漏洞源于g_regex_replace函数在使用G_REGEX_RAW编译标志和大小写替换转义时，string_append函数使用假设有效UTF-8输入的UTF-8函数处理匹配的子字符串，即使字符串被视为原始字节，可能导致缓冲区过度读取，进而造成1-5字节的信息泄露以及当缓冲区过度读取跨越页面边界时导致

CVSS 6.5 · Medium EPSS 0.85% · P56

Affected Version Matrix 36

VendorProduct Version RangeStatus
GNOME GLib < 2.86.5 affected
< 2.88.1 affected
Red Hat Cert Manager support for Red Hat OpenShift release 1.19 1788348522< * unaffected
1788348571< * unaffected
1788348571< * unaffected
1788348594< * unaffected
Red Hat Red Hat Discovery 2 1788205779< * unaffected
1788206196< * unaffected
Red Hat Red Hat Enterprise Linux 10 0:2.80.4-12.el10_2.21< * unaffected
any affected
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:2.80.4-4.el10_0.17< * unaffected
Red Hat Red Hat Enterprise Linux 6 any affected
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:2.56.1-13.el7_9.1< * unaffected
Red Hat Red Hat Enterprise Linux 8 0:2.70.1-9.el8_10< * unaffected
0:2.56.4-177.el8_10< * unaffected
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:2.56.4-10.el8_4.7< * unaffected
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:2.56.4-10.el8_4.7< * unaffected
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:2.56.4-158.el8_6.7< * unaffected
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:2.56.4-158.el8_6.7< * unaffected
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:2.56.4-165.el8_8.2< * unaffected
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:2.56.4-165.el8_8.2< * unaffected
Red Hat Red Hat Enterprise Linux 9 0:2.68.4-19.el9_8.9< * unaffected
0:2.68.4-19.el9_8.9< * unaffected
any affected
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.68.4-7.el9_2.7< * unaffected
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:2.68.4-14.el9_4.8< * unaffected
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:2.68.4-16.el9_6.7< * unaffected
Red Hat Red Hat Hardened Images any unaffected
Red Hat Red Hat Update Infrastructure 5 1787241211< * unaffected
1787135742< * unaffected
1787241260< * unaffected
1788880445< * unaffected
1788880464< * unaffected
1788880456< * unaffected
1788765051< * unaffected
1788880581< * unaffected
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I. Basic Information for CVE-2026-58012

Vulnerability Information
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Vulnerability Title
Glib: buffer over-read in g_regex_replace() via glib/gregex.c:string_append() and g_utf8_next_char()
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
缓冲区上溢读取
Source: CVE Program / CVE List V5
Vulnerability Title
GNOME glib 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNOME glib是GNOME基金会开源的一个通用的、可移植的实用程序库。提供了许多有用的数据类型、宏、类型转换、字符串实用程序、文件实用程序、主循环抽象等。 GNOME glib存在缓冲区错误漏洞，该漏洞源于g_regex_replace函数在使用G_REGEX_RAW编译标志和大小写替换转义时，string_append函数使用假设有效UTF-8输入的UTF-8函数处理匹配的子字符串，即使字符串被视为原始字节，可能导致缓冲区过度读取，进而造成1-5字节的信息泄露以及当缓冲区过度读取跨越页面边界时导致
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GNOME GLib 0 ~ 2.86.5 -
Red Hat Red Hat Enterprise Linux 10 0:2.80.4-12.el10_2.21 ~ * cpe:/o:redhat:enterprise_linux:10.2
Red Hat Red Hat Enterprise Linux 10.0 Extended Update Support 0:2.80.4-4.el10_0.17 ~ * cpe:/o:redhat:enterprise_linux_eus:10.0
Red Hat Red Hat Enterprise Linux 7 Extended Lifecycle Support 0:2.56.1-13.el7_9.1 ~ * cpe:/o:redhat:rhel_els:7
Red Hat Red Hat Enterprise Linux 8 0:2.70.1-9.el8_10 ~ * cpe:/a:redhat:enterprise_linux:8::crb
Red Hat Red Hat Enterprise Linux 8 0:2.56.4-177.el8_10 ~ * cpe:/a:redhat:enterprise_linux:8::crb
Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support 0:2.56.4-10.el8_4.7 ~ * cpe:/o:redhat:rhel_aus:8.4::baseos
Red Hat Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On 0:2.56.4-10.el8_4.7 ~ * cpe:/o:redhat:rhel_aus:8.4::baseos
Red Hat Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support 0:2.56.4-158.el8_6.7 ~ * cpe:/o:redhat:rhel_aus:8.6::baseos
Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On 0:2.56.4-158.el8_6.7 ~ * cpe:/o:redhat:rhel_aus:8.6::baseos
Red Hat Red Hat Enterprise Linux 8.8 Telecommunications Update Service 0:2.56.4-165.el8_8.2 ~ * cpe:/o:redhat:rhel_e4s:8.8::baseos
Red Hat Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions 0:2.56.4-165.el8_8.2 ~ * cpe:/o:redhat:rhel_e4s:8.8::baseos
Red Hat Red Hat Enterprise Linux 9 0:2.68.4-19.el9_8.9 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9 0:2.68.4-19.el9_8.9 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions 0:2.68.4-7.el9_2.7 ~ * cpe:/a:redhat:rhel_e4s:9.2::appstream
Red Hat Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions 0:2.68.4-14.el9_4.8 ~ * cpe:/a:redhat:rhel_e4s:9.4::appstream
Red Hat Red Hat Enterprise Linux 9.6 Extended Update Support 0:2.68.4-16.el9_6.7 ~ * cpe:/a:redhat:rhel_eus:9.6::appstream
Red Hat Cert Manager support for Red Hat OpenShift release 1.19 1788348522 ~ * cpe:/a:redhat:cert_manager:1.19::el9
Red Hat Cert Manager support for Red Hat OpenShift release 1.19 1788348571 ~ * cpe:/a:redhat:cert_manager:1.19::el9
Red Hat Cert Manager support for Red Hat OpenShift release 1.19 1788348571 ~ * cpe:/a:redhat:cert_manager:1.19::el9
Red Hat Cert Manager support for Red Hat OpenShift release 1.19 1788348594 ~ * cpe:/a:redhat:cert_manager:1.19::el9
Red Hat Red Hat Discovery 2 1788205779 ~ * cpe:/a:redhat:discovery:2::el9
Red Hat Red Hat Discovery 2 1788206196 ~ * cpe:/a:redhat:discovery:2::el9
Red Hat Red Hat Update Infrastructure 5 1787241211 ~ * cpe:/a:redhat:rhui:5::el9
Red Hat Red Hat Update Infrastructure 5 1787135742 ~ * cpe:/a:redhat:rhui:5::el9
Red Hat Red Hat Update Infrastructure 5 1787241260 ~ * cpe:/a:redhat:rhui:5::el9
Red Hat Red Hat Update Infrastructure 5 1788880445 ~ * cpe:/a:redhat:rhui:5::el9
Red Hat Red Hat Update Infrastructure 5 1788880464 ~ * cpe:/a:redhat:rhui:5::el9
Red Hat Red Hat Update Infrastructure 5 1788880456 ~ * cpe:/a:redhat:rhui:5::el9
Red Hat Red Hat Update Infrastructure 5 1788765051 ~ * cpe:/a:redhat:rhui:5::el9

II. Public POCs for CVE-2026-58012

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III. Intelligence Information for CVE-2026-58012

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Vendor Advisories for CVE-2026-58012 (18)

Proof of Concept for CVE-2026-58012 (1)

Other References for CVE-2026-58012 (2)

Same Patch Batch · GNOME · 2026-06-30 · 7 CVEs total

CVE-2026-58016 7.5 HIGH Glib: integer underflow in gio/gdbusintrospection.c via "g_dbus_node_info_new_for_xml"
CVE-2026-58014 7.3 HIGH Glib: off-by-one error in glib/gkeyfile.c via "g_key_file_get_locale_string_list"
CVE-2026-58011 6.5 MEDIUM Glib: out-of-bounds read in glib/gdatetime.c:g_date_time_get_ymd via invalid gdatetime
CVE-2026-58013 6.5 MEDIUM Glib: buffer over-read in glib/giochannel.c via "g_io_channel_read_line_backend"
CVE-2026-58010 6.5 MEDIUM Glib: buffer over-read in glib/gvariant-serialiser.c via gvs_tuple_is_normal()
CVE-2026-58015 5.9 MEDIUM Glib: path traversal in glib/gio/gdbusauthmechanismsha1.c via keyring_lookup_entry and mec

IV. Related Vulnerabilities

Same product: GLib
Same vendor: GNOME
Same weakness: CWE-126

V. Comments for CVE-2026-58012

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