Bug 2494874

Summary:	CVE-2026-58012 mingw-glib2: buffer over-read in g_regex_replace() via glib/gregex.c:string_append() and g_utf8_next_char() [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	mingw-glib2	Assignee:	Kalev Lember <kalevlember>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	fedora, kalevlember, manisandro, marcandre.lureau, rjones
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["cf8fc7ed-496d-4ddd-92d6-0d1793232c5f"]}
Fixed In Version:	mingw-glib2-2.88.2-2.fc44 mingw-glib2-2.86.5-2.fc43	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-07-17 00:52:32 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2492247

Description Guilherme de Almeida Suckevicz 2026-06-30 12:58:14 UTC

Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

A heap-buffer-overflow READ vulnerability exists in GLib's g_regex_replace() function when used with G_REGEX_RAW compile flag and case-change replacement escapes (\U, \L, \u, \l).
In G_REGEX_RAW mode, PCRE2 treats the subject string as raw bytes rather than UTF-8. Matched substrings can therefore contain arbitrary byte sequences that are not valid UTF-8. When the replacement string contains case-change escapes (e.g., \U\0 to uppercase the match), the internal string_append() function processes the matched substring using UTF-8 functions (g_utf8_get_char(), g_utf8_next_char()) which assume valid UTF-8 input. A multi-byte UTF-8 lead byte (e.g., 0xF4 indicating a 4-byte sequence) in the matched data causes these functions to read beyond the heap-allocated buffer.

Comment 1 Fedora Update System 2026-07-02 17:12:17 UTC

FEDORA-2026-825932ea60 (mingw-glib2-2.86.5-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-825932ea60

Comment 2 Fedora Update System 2026-07-02 17:13:23 UTC

FEDORA-2026-5a55313adb (mingw-glib2-2.88.2-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-5a55313adb

Comment 3 Fedora Update System 2026-07-03 01:26:25 UTC

FEDORA-2026-5a55313adb has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-5a55313adb`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-5a55313adb

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 4 Fedora Update System 2026-07-03 01:47:36 UTC

FEDORA-2026-825932ea60 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-825932ea60`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-825932ea60

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 5 Fedora Update System 2026-07-09 01:27:12 UTC

FEDORA-2026-8e39f35701 has been pushed to the Fedora 43 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-8e39f35701`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-8e39f35701

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 6 Fedora Update System 2026-07-09 01:45:48 UTC

FEDORA-2026-7bf2937528 has been pushed to the Fedora 44 testing repository.
Soon you'll be able to install the update with the following command:
`sudo dnf upgrade --enablerepo=updates-testing --refresh --advisory=FEDORA-2026-7bf2937528`
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2026-7bf2937528

See also https://fedoraproject.org/wiki/QA:Updates_Testing for more information on how to test updates.

Comment 7 Fedora Update System 2026-07-17 00:52:32 UTC

FEDORA-2026-7bf2937528 (mingw-glib2-2.88.2-2.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.

Comment 8 Fedora Update System 2026-07-17 01:09:26 UTC

FEDORA-2026-8e39f35701 (mingw-glib2-2.86.5-2.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.