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OpenAdvisories
Medium RLSA-2026:84753 4 CVEs

Moderate: glibc security update

Published Oct 20, 2026 · Updated Oct 20, 2026

Ecosystem: Rocky Linux

Summary

The glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the name service cache daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly.

Security Fix(es):

* glibc: Non-progress DoS in SHIFT_JISX0213 -&gt (CVE-2026-77117)

* glibc: Non-progress DoS in EUC_JISX0213 -> UCS-4 conversion state (CVE-2026-80489)

* glibc: glibc: Heap buffer overflow via attacker-controlled fopen mode string (CVE-2026-18374)

* glibc: glibc DNS stub resolver: Denial of Service via long search domain in configuration (CVE-2026-8674)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Fixed packages 1

ReleasePackageFixed in
Rocky Linux · 10 glibc 0:2.39-145.el10_2

Vulnerabilities 4

  • Medium 5.9
    CVE-2026-77117

    SHIFT_JISX0213 decoding may hang on crafted input

    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_JISX…

    The GNU C Library glibc glibc eglibc Debian Ubuntu Azure Linux Wolfi
  • Medium 5.9
    CVE-2026-80489

    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…

    The GNU C Library glibc glibc eglibc Debian Ubuntu Azure Linux Wolfi
  • Medium 5.3
    CVE-2026-8674

    Assertion failure in the DNS stub resolver with a long search domain

    Initializing the DNS stub resolver from an /etc/resolv.conf file, or a LOCALDOMAIN environment variable, whose search list contains a domain of roughly 200 characters or more in the GNU C Library version 2.26 to 2.44 results in an assertion failure which abor…

    The GNU C Library glibc glibc eglibc Debian Ubuntu Azure Linux Wolfi
  • Medium 4.9
    CVE-2026-18374

    Passing an effectively empty string to the `,ccs=` syntax extension of the mode argument in the `fopen` function in the…

    The GNU C Library glibc glibc eglibc Debian Ubuntu Azure Linux Wolfi

References

  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2523274
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2524870
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2525256
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2536382
  • advisory
    https://access.redhat.com/errata/RHSA-2026:84753