Bug 2494877

Summary:	CVE-2026-58013 mingw-glib2: buffer over-read in glib/giochannel.c via "g_io_channel_read_line_backend" [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": ["77ff4afa-6e87-4b0b-8af9-c4c2742be9c6"]}
Fixed In Version:	mingw-glib2-2.88.2-2.fc44	Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-07-17 00:52:36 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:	2492248

Description Guilherme de Almeida Suckevicz 2026-06-30 12:58:35 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 occurs in g_io_channel_read_line_backend() at giochannel.c:1831 when a custom line terminator of length > 1 is set via g_io_channel_set_line_term(). The memcmp call reads line_term_len bytes from nextchar, but the loop condition nextchar < lastchar only guarantees 1 byte is available. When nextchar is within line_term_len - 1 bytes of lastchar, memcmp reads past the GString buffer into ASan redzone / unallocated memory.

Comment 1 Fedora Update System 2026-07-02 17:13:26 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 2 Fedora Update System 2026-07-03 01:26:27 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 3 Fedora Update System 2026-07-09 01:45:51 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 4 Fedora Update System 2026-07-17 00:52:36 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.