Skip to content

GLIBC-SA-2026-0020 on Cyberus Linux 26.05

Aliases: GLIBC-SA-2026-0020, CVE-2026-80489

Packages: glibc

Status: Plausible

Advisory Information

EUC_JISX0213 decoding may hang on crafted input

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.

CVE-Id: CVE-2026-80489
Public-Date: 2026-08-26
Vulnerable-Commit: 93a568aaba1d3da3497102dfe1eeb81070a24c1c (2.2.4-823)
Fix-Commit: 4dafa087ff5fe7df45bd37dc727e988da6b8c935 (2.45)
Fix-Commit: cb61572ea3f773e1e1978f6c412cc36a30acdb0c (2.44-31)
Fix-Commit: 3ad1bbd8f94a207efb108a38d434695eab8a1831 (2.43-56)
Fix-Commit: 87c2795cf6a7584e351036ab43e74b03ccc54a83 (2.42-89)
Fix-Commit: ec116a0fbedcc860631e525e70b409cf295f27da (2.41-158)
CVSS: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - 5.9
Reported-by: AISLE in partnership with Red Hat

Updates

2026-09-15 21:40 CEST

Metadata changes:

  • Status for package glibc: “Plausible”

2026-09-15 21:37 CEST

Metadata changes:

  • Status for package glibc: “New”