CVE-2026-57053 Information disclosure in libidn
An out-of-bounds read in GNU libidn allows attackers to read uninitialized memory, potentially disclosing sensitive information.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-57053?
CVE-2026-57053 is a medium-severity vulnerability in GNU libidn, published on 23 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
GNU libidn before 1.44 is prone to out-of-bounds reads of uninitialized memory in the ToUnicode APIs because of mishandling in idna_to_unicode_internal. The affected code is not present in libidn2.
Weakness: CWE-1284
Which versions are affected by CVE-2026-57053?
It affects 1 product.
Linux distribution packages (8)
idn2 Red Hat:hummingbird:1 | All versions | 0:2.3.8-4.hum1 |
libidn2 Red Hat:hummingbird:1 | All versions | 0:2.3.8-4.hum1 |
libidn2-devel Red Hat:hummingbird:1 | All versions | 0:2.3.8-4.hum1 |
libidn SUSE:Linux Enterprise Module for Basesystem 15 SP7 | All versions | 1.34-150000.3.5.1 |
libidn SUSE:Linux Enterprise Server 16.0 | All versions | 1.43-160000.3.1 |
libidn SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | All versions | 1.28-5.9.1 |
libidn SUSE:Linux Enterprise Server for SAP applications 16.0 | All versions | 1.43-160000.3.1 |
libidn openSUSE:Leap 16.0 | All versions | 1.43-160000.3.1 |
Products include Gnu Libidn.
How do I fix CVE-2026-57053?
Upgrade to a fixed version.
Is CVE-2026-57053 being exploited?
There is no known exploitation of CVE-2026-57053 in the wild and no public exploit code.
Other vulnerabilities in GNU libidn
Sources
Also known as DEBIAN-CVE-2026-57053, ECHO-f940-3352-dc67, GHSA-xpv7-vm32-p7wv, JLSEC-2026-667, MGASA-2026-0262, OESA-2026-2932 and 11 more.