CVE-2026-57053

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.

Published: 2026-06-23 Last update: 2026-06-25 Assigner: [email protected] Source: [email protected]
NVD Status：Awaiting Analysis，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-57053 is rated Low Risk (16.7/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.12%). Low composite risk—no urgent action required; patch on your normal maintenance cycle and revisit priority if CVSS or EPSS increases.

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-2026-57053

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 2026-06-24 — 0.12% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-57053

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.0 3.1 MEDIUM
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
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.
 1.4 2.5 [email protected]

Weakness enumeration for CVE-2026-57053

GitHub Security Advisory for CVE-2026-57053

GHSA-xpv7-vm32-p7wv · Severity: medium — GNU libidn before 1.44 is prone to out-of-bounds reads of uninitialized memory in the ToUnicode...

OS Trackers for CVE-2026-57053

vendor priority summary link
debian not yet assigned CVE-2026-57053 not yet assigned priority: Debian including 1 source packages (libidn), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 3, resolved 2. https://security-tracker.debian.org/tracker/CVE-2026-57053
suse medium — https://www.suse.com/security/cve/CVE-2026-57053/
ubuntu medium CVE-2026-57053 medium priority: Ubuntu including 1 source packages (libidn), 9 status rows across 9 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream, xenial): needs-triage 8, released 1. https://ubuntu.com/security/CVE-2026-57053

Affected software / configurations for CVE-2026-57053

Vendor Product Version Raw CPE
gnu libidn < 1.44 cpe:2.3:a:gnu:libidn:*:*:*:*:*:*:*:*

References for CVE-2026-57053

cvelogic Threat Intelligence