Bug 2494872

Summary:	CVE-2026-58011 glib2: out-of-bounds read in glib/gdatetime.c:g_date_time_get_ymd via invalid GDateTime [fedora-all]
Product:	[Fedora] Fedora	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	glib2	Assignee:	Matthias Clasen <mclasen>
Status:	CLOSED WONTFIX	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	rawhide	CC:	gnome-sig, lpavan, mclasen, rhughes, rstrode
Target Milestone:	---	Keywords:	Security, SecurityTracking
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	{"flaws": ["d5dbd9e2-ac4b-4c60-89d5-2a510990ec24"]}
Fixed In Version:		Doc Type:	---
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2026-08-12 14:48:52 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:	2492245

Description Guilherme de Almeida Suckevicz 2026-06-30 12:57:58 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 global-buffer-overflow (out-of-bounds read) exists in GLib's g_date_time_get_ymd() function, triggered when operating on an invalid GDateTime object produced by g_date_time_add_full(). The g_date_time_add_full() function does not validate that the resulting date falls within the supported range (years 1–9999), allowing construction of a GDateTime with a negative or zero days field. When any getter function (e.g., g_date_time_get_month(), g_date_time_get_year()) is subsequently called, the internal g_date_time_get_ymd() routine computes a negative array index, causing a 2-byte OOB read from adjacent global data.

Comment 1 lpavan 2026-08-12 14:48:52 UTC

This was fixed upstream with the following releases:

- 2.86.5
- 2.88.1
- 2.89.0

Given that Fedora currently ships 2.86.5 or later across all releases, I'm going to close this.