Passing an effectively empty string to the `,ccs=` syntax extension of the mode argument in the `fopen` function in the GNU C Library version 2.45 or earlier may result in a heap buffer overflow when the mode string input to the function is attacker controlled. This usage pattern is not seen in applications in common GNU/Linux distributions and applications that process user-supplied values for `ccs` should not pass them through without validation.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4250-1 advisory.

    - CVE-2026-6368: invalid free via wordexp WRDE_APPEND rollback (bsc#1274726).
    - CVE-2026-6791: stack overflow in wordexp tilde expansion (bsc#1274723).
    - CVE-2026-18374: heap buffer overflow in the fopen ccs extension (bsc#1277262).
    - CVE-2026-19499: buffer overflow in strfmon right-justification padding (bsc#1276892).
    - CVE-2026-19542: out-of-bounds array write in tdelete (bsc#1276946).
    - CVE-2026-77117: SHIFT_JISX0213 decoding lacks pending character reset (bsc#1277921).
    - CVE-2026-80489: EUC_JISX0213 decoding lacks pending character reset (bsc#1277922).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4204-1 advisory.

    - CVE-2026-6368: wordexp WRDE_APPEND rollback restores stale we_wordv, leading to invalid free in wordfree       (bsc#1274726).
    - CVE-2026-6791: wordexp: unbounded alloca (strndupa) in parse_tilde (bsc#1274723).
    - CVE-2026-18374: overflow in the fopen ccs extension (bsc#1277262).
    - CVE-2026-19542: Fix out-of-bounds array write in tdelete (bsc#1276946).
    - CVE-2026-77117: non-progress DoS in SHIFT_JISX0213 -> UCS-4 conversion state handling (bsc#1277921).
    - CVE-2026-80489: non-progress DoS in SHIFT_JISX0213 -> UCS-4 conversion state handling (bsc#1277922).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Passing an effectively empty string to the `,ccs=` syntax extension of the mode argument in the `fopen`     function in the GNU C Library version 2.45 or earlier may result in a heap buffer overflow when the mode     string input to the function is attacker controlled. This usage pattern is not seen in applications in     common GNU/Linux distributions and applications that process user-supplied values for `ccs` should not     pass them through without validation. (CVE-2026-18374)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Type	Severity
347899	SUSE SLED15: glibc / glibc-32bit / glibc-devel / glibc-devel-32bit / etc (SUSE-SU-2026:4250-1)	Nessus	SuSE Local Security Checks	Local	critical
346800	SUSE SLES12: glibc / glibc-32bit / glibc-devel / glibc-devel-32bit / etc (SUSE-SU-2026:4204-1)	Nessus	SuSE Local Security Checks	Local	critical
341149	Linux Distros Unpatched Vulnerability : CVE-2026-18374	Nessus	Misc.	Local	medium

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CVE-2026-18374

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