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CVE-2026-57053

Quick assessment

Affected
GNU libidn
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GNU libidn是美国GNU基金会开源的一套国际化字符串处理库。 GNU libidn 1.44之前版本存在输入验证错误漏洞，该漏洞源于idna_to_unicode_internal函数处理不当，可能导致ToUnicode APIs中未初始化内存的越界读取。

CVSS 4.0 · Medium EPSS 0.14% · P3

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
GNU libidn < 1.44 affected
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I. Basic Information for CVE-2026-57053

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1284
Source: CVE Program / CVE List V5
Vulnerability Title
GNU libidn 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GNU libidn是美国GNU基金会开源的一套国际化字符串处理库。 GNU libidn 1.44之前版本存在输入验证错误漏洞，该漏洞源于idna_to_unicode_internal函数处理不当，可能导致ToUnicode APIs中未初始化内存的越界读取。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
GNU libidn 0 ~ 1.44 -

II. Public POCs for CVE-2026-57053

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III. Intelligence Information for CVE-2026-57053

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Mailing List Discussions for CVE-2026-57053 (2)

IV. Related Vulnerabilities

Same vendor: GNU
Same weakness: CWE-1284

V. Comments for CVE-2026-57053

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