{"id":"CVE-2026-77117","title":"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…","summary":"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…","severity":"medium","cvss":5.9,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-835"],"vendor":"The GNU C Library","product":"glibc","affected":["glibc >= 2.3 <= 2.44"],"patched":["hardened_images"],"published":"2026-09-15","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:47.257","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77117","references":[{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=34556","label":"3ff69d7a-14f2-4f67-a097-88dee7810d18"},{"url":"https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0019","label":"3ff69d7a-14f2-4f67-a097-88dee7810d18"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77117.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-77117"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2523274"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-77117"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77117"},{"url":"https://access.redhat.com/errata/RHSA-2026:61737"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00412,"epssPercentile":0.35099,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-15T12:26:20.894498Z"},"ingestedAt":"2026-09-15T11:36:07.418Z","slug":"CVE-2026-77117","body":"## Overview\n\nConverting 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.\n\nSome 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **RHSA-2026:61737** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61737)\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-77117.json)","depth":"sunlit","depthScore":33,"depthScoreParts":{"impact":32.5,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}