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CVE-2026-77117— SHIFT_JISX0213 decoding may hang on crafted input

Quick assessment

Affected
The GNU C Library glibc
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.

在 GNU C 库（glibc）2.3 至 2.44 版本中，使用 iconv 等工具将精心构造的 SHIFT_JISX0213 输入转换为 UCS-4 或内部宽字符编码时，转换器可能出现“无进展”（no progress）的情况，导致调用该转换功能的应用程序挂起。 某些 SHIFT_JISX0213 序列会解码为两个码点。如果输出缓冲区仅能容纳其中第一个码点，转换器会将第二个码点暂存于转换状态中，并返回错误代码 E2BIG；但在下次调用输出该暂存字符后，却未清除该暂存字符。随后，转换器会持续输出这个暂存字符，却不

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-77117

Vulnerability Information
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Vulnerability Title
SHIFT_JISX0213 decoding may hang on crafted input
Source: CVE Program / CVE List V5
Vulnerability Description
Converting crafted SHIFT_JISX0213 input to UCS-4 or the internal wide character encoding, for example with iconv, in the GNU C Library version 2.3 to 2.44 may result in the converter making no progress, causing the calling application to hang. Some SHIFT_JISX0213 sequences decode to two code points. If the output buffer has room for only the first one, the converter stores the second in the conversion state and returns E2BIG, but it never clears that pending character after emitting it on the next call. The converter then keeps emitting the pending character without consuming further input, so an application that retries the conversion loops forever. The input must be attacker controlled and the application must convert it with an output buffer small enough to split the two code points. Only the SHIFT_JISX0213 character set is affected, which is not commonly used. The related defect in the EUC_JISX0213 converter is tracked separately as CVE-2026-80489.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不可达退出条件的循环(无限循环)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
The GNU C Library glibc 2.3 ~ 2.44 -

II. Public POCs for CVE-2026-77117

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III. Intelligence Information for CVE-2026-77117

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Vendor Advisories for CVE-2026-77117 (1)

Security Blog Posts for CVE-2026-77117 (1)

IV. Related Vulnerabilities

Same product: glibc
Same vendor: The GNU C Library
Same weakness: CWE-835

V. Comments for CVE-2026-77117

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