CVE-2026-1489 | Glib: glib: memory corruption via integer overflow in unicode case conversion

A flaw was found in GLib. An integer overflow vulnerability in its Unicode case conversion implementation can lead to memory corruption. By processing specially crafted and extremely large Unicode strings, an attacker could trigger an undersized memory allocation, resulting in out-of-bounds writes. This could cause applications utilizing GLib for string conversion to crash or become unstable.

Published: 2026-01-27 Last update: 2026-06-02 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-1489 is rated Low Risk (23.2/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.02%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-1489

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-21 0.07% 0.02% -0.05%
2 2026-02-24 0.03% 0.07% +0.03%
3 2026-01-28 — 0.03% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-1489

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.4 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.8 2.5 [email protected]

Weakness enumeration for CVE-2026-1489

GitHub Security Advisory for CVE-2026-1489

GHSA-9m4g-m3p5-p6gm · Severity: medium — A flaw was found in GLib. An integer overflow vulnerability in its Unicode case conversion...

OS Trackers for CVE-2026-1489

vendor priority summary link
debian not yet assigned CVE-2026-1489 not yet assigned priority: Debian including 1 source packages (glib2.0), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2026-1489
redhat medium — https://access.redhat.com/security/cve/CVE-2026-1489
suse high CVE-2026-1489 severity important: SUSE including 400 source package names (13.2-9.67:coreutils-9.4-5.1, 13.2-9.67:libglib-2_0-0-2.76.2-12.1, …), 1348 product×package rows across 166 product lines (Container suse/manager/5.0/x86_64/proxy-httpd, Container suse/manager/5.0/x86_64/proxy-salt-broker, … (166 product lines)): Fixed 1100, Known Affected 231, First Fixed 17. https://www.suse.com/security/cve/CVE-2026-1489/
ubuntu medium CVE-2026-1489 medium priority: Ubuntu including 1 source packages (glib2.0), 8 status rows across 8 suites (bionic, focal, jammy, noble, questing, trusty, upstream, xenial): needed 4, released 4. https://ubuntu.com/security/CVE-2026-1489

Affected software / configurations for CVE-2026-1489

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2026-1489

cvelogic Threat Intelligence