CVE-2026-1484

Publication date 27 January 2026

Last updated 5 February 2026

Ubuntu priority

Cvss 3 Severity Score

Description

A flaw was found in the GLib Base64 encoding routine when processing very large input data. Due to incorrect use of integer types during length calculation, the library may miscalculate buffer boundaries. This can cause memory writes outside the allocated buffer. Applications that process untrusted or extremely large Base64 input using GLib may crash or behave unpredictably.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
glib2.0	25.10 questing	Fixed 2.86.0-2ubuntu0.3
	24.04 LTS noble	Fixed 2.80.0-6ubuntu3.8
	22.04 LTS jammy	Fixed 2.72.4-0ubuntu2.9
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
glib2.0	Upstream: https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4978 Upstream: https://gitlab.gnome.org/GNOME/glib/-/merge_requests/4979 Upstream: 5ba0ed9 Upstream: 25429bd

Severity score breakdown

Parameter	Value
Base score	4.2 · Medium
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	None
Integrity impact	Low
Availability impact	Low
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:L

References

Related Ubuntu Security Notices (USN)

USN-8017-1
GLib vulnerabilities
5 February 2026