Medium [CVE-2026-80489] Non-progress DoS in EUC_JISX0213 -> UCS-4 conversion state
This medium-severity Red Hat Linux advisory covers CVE-2026-80489 affecting Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6.
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Summary
Converting crafted EUC_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 EUC_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 EUC_JISX0213 character set is affected, which is not commonly used.
The related defect in SHIFT_JISX0213 converter is tracked separately as CVE-2026-77117. A flaw was found in glibc.
Impact is limited to process hang (availability only). Red Hat severity: Moderate — CVSS 5.9 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-835. Affected Red Hat products: Red Hat Hardened Images; 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.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
- glibc-main-2.43-8.4.hum1
- RHSA-2026:61737
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
Mitigation checklist
- To mitigate this avoid converting untrusted data with that charset, or disable the conversion path if unused. Where conversion of untrusted input cannot be avoided, restrict access to trusted clients and apply process CPU/resource limits to contain hang impact.
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
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