CVE-2026-77117
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.
Scoring
- Severity
- MEDIUM
- CVSS base score
- 5.9
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS probability
- 0.41%
- CWE
- CWE-835
- Published
- 2026-09-15
- Last modified
- 2026-09-15
Affected products
- The GNU C Library glibc
Weakness type
Related vulnerabilities
- CVE-2026-24816 — Cookie Security Vulnerabilities in datavane/tis
- CVE-2026-24804 — A infinite loop vulnerability in coolsnowwolf/lede
- CVE-2026-24803 — A possible infinite loop vulnerability in coolsnowwolf/lede
- CVE-2025-55118 — BMC Control-M/Agent memory corruption in SSL/TLS communication
- CVE-2026-21905 — Junos OS: SRX Series, MX Series with MX-SPC3 or MS-MPC: Receipt of multiple specific SIP messages results in flow management process crash
- CVE-2025-7054 — Infinite loop triggered by connection ID retirement
- CVE-2025-3857 — Infinite loop condition in Amazon.IonDotnet
- CVE-2025-20253 — Cisco IOS, IOS XE, Secure Firewall Adaptive Security Appliance, and Secure Firewall Threat Defense Software IKEv2 Denial of Service Vulnerability