Calling strfmon and strfmon_l in the GNU C Library version 2.38 to 2.44 can write past the end of the caller-supplied output buffer when a conversion uses right-justified width padding. Exploitation requires an application code path that calls strfmon or strfmon_l with right-justified width padding into a destination buffer that is large enough for the padding to succeed but too small for the internal memmove call. The field width or format may be attacker-influenced or a fixed susceptible pattern in the caller. At the time of publication, no network-facing application impact is known.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Calling strfmon and strfmon_l in the GNU C Library version 2.38 to 2.44 can write past the end of the
    caller-supplied output buffer when a conversion uses right-justified width padding. Exploitation requires
    an application code path that calls strfmon or strfmon_l with right-justified width padding into a
    destination buffer that is large enough for the padding to succeed but too small for the internal memmove
    call. The field width or format may be attacker-influenced or a fixed susceptible pattern in the caller.
    At the time of publication, no network-facing application impact is known. (CVE-2026-19499)

The remote SUSE Linux SLES16 / SLES_SAP16 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:23934-1 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-2026-8674: reachable assert in `resolv/resolv_conf.c:update_from_conf` allows an attacker in a local     network to       trigger a process crash (bsc#1281297).
    - 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).
    - CVE-2026-86805: TOCTOU race condition in the dynamic loader allows local attackers to escalate     privileges       (bsc#1282509).


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 openSUSE 16 host has packages installed that are affected by multiple vulnerabilities as referenced in the openSUSE-SU-2026:21968-1 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-2026-8674: reachable assert in `resolv/resolv_conf.c:update_from_conf` allows an attacker in a local     network to       trigger a process crash (bsc#1281297).
    - 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).
    - CVE-2026-86805: TOCTOU race condition in the dynamic loader allows local attackers to escalate     privileges       (bsc#1282509).


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 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 Ubuntu 22.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8737-1 advisory.

    It was discovered that GNU C Library had a buffer overflow in the strfmon function when handling right-     justification padding. An attacker could possibly use this issue to cause a denial of service or execute     arbitrary code. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-19499)

    It was discovered that GNU C Library had an out-of-bounds stack array access in the tdelete function. An     attacker could possibly use this issue to cause a denial of service or execute arbitrary code.
    (CVE-2026-19542)

    It was discovered that GNU C Library incorrectly handled memory when calling wordexp with the WRDE_APPEND     flag. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-6368)

    It was discovered that GNU C Library had a stack overflow in the wordexp function when expanding paths     beginning with a tilde followed by a long username. An attacker could possibly use this issue to cause a     denial of service or execute arbitrary code. (CVE-2026-6791)

    It was discovered that GNU C Library had a hang in the SHIFT_JISX0213 character set converter. An attacker     could possibly use this issue to cause a denial of service. (CVE-2026-77117)

    It was discovered that GNU C Library had a hang in the EUC_JISX0213 character set converter. An attacker     could possibly use this issue to cause a denial of service. (CVE-2026-80489)

Tenable has extracted the preceding description block directly from the Ubuntu 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.

  - Calling strfmon and strfmon_l in the GNU C Library version 2.38 to 2.44 can write past the end of the     caller-supplied output buffer when a conversion uses right-justified width padding. Exploitation requires     an application code path that calls strfmon or strfmon_l with right-justified width padding into a     destination buffer that is large enough for the padding to succeed but too small for the internal memmove     call. The field width or format may be attacker-influenced or a fixed susceptible pattern in the caller.
    At the time of publication, no network-facing application impact is known. (CVE-2026-19499)

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

ID	Name	Product	Family	Type	Severity
457585	Echo: glibc: security update to 2.41-12+deb13u3+e5	Tenable Cloud Security	Echo Local Security Checks	Local	high
457585	Echo: glibc: security update to 2.41-12+deb13u3+e5	Tenable Self-Hosted Container Security	Echo Local Security Checks	Local	high
362572	SUSE SLES16: glibc / glibc-devel / glibc-devel-static / glibc-extra / etc (SUSE-SU-2026:23934-1)	Nessus	SuSE Local Security Checks	Local	critical
362508	openSUSE 16: cross-aarch64-glibc-devel / cross-ppc64le-glibc-devel / etc (openSUSE-SU-2026:21968-1)	Nessus	SuSE Local Security Checks	Local	critical
347899	SUSE SLED15: glibc / glibc-32bit / glibc-devel / glibc-devel-32bit / etc (SUSE-SU-2026:4250-1)	Nessus	SuSE Local Security Checks	Local	critical
344610	Ubuntu 22.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS : GNU C Library vulnerabilities (USN-8737-1)	Nessus	Ubuntu Local Security Checks	Local	critical
339443	Linux Distros Unpatched Vulnerability : CVE-2026-19499	Nessus	Misc.	Local	high

Detections

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CVE-2026-19499

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Tenable Plugins

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high