CVE-2026-77117

The record

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.

Affected packages

Related vulnerabilities

• CVE-2026-80489 Converting crafted EUC_JISX0213 input to UCS-4 or the internal wide character encoding… CWE-835
• CVE-2026-6554 libpcap BPF interpreter treats the offset in the 'ja L' BPF instruction as a signed… CWE-835
• CVE-2026-55373 OpenEXR is the reference implementation and specification for the EXR image format… CWE-835
• CVE-2026-72712 Nmap versions up to and including 7.99 contains a denial of service vulnerability that… CWE-835
• CVE-2026-68499 re2 provides Node.js bindings for Google's RE2 regular expression engine. CWE-835
• CVE-2026-59901 Netty is an asynchronous, event-driven network application framework. CWE-835
• CVE-2026-67214 nanoid (Nano ID) before 5.1.16 contains an infinite loop in the customAlphabet and nanoid… CWE-835
• CVE-2026-67213 nanoid (Nano ID) before 5.1.6 contains an infinite loop in the customAlphabet and… CWE-835