HarfBuzz is a text shaping engine. Prior to version 12.3.0, a null pointer dereference vulnerability exists in the SubtableUnicodesCache::create function located in src/hb-ot-cmap-table.hh. The function fails to check if hb_malloc returns NULL before using placement new to construct an object at the returned pointer address. When hb_malloc fails to allocate memory (which can occur in low-memory conditions or when using custom allocators that simulate allocation failures), it returns NULL. The code then attempts to call the constructor on this null pointer using placement new syntax, resulting in undefined behavior and a Segmentation Fault. This issue has been patched in version 12.3.0.

The version of firefox installed on the remote host is prior to 140.7.0-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2FIREFOX-2026-051 advisory.

    HarfBuzz is a text shaping engine. Prior to version 12.3.0, a null pointer dereference vulnerability     exists in the SubtableUnicodesCache::create function located in src/hb-ot-cmap-table.hh. The function     fails to check if hb_malloc returns NULL before using placement new to construct an object at the returned     pointer address. When hb_malloc fails to allocate memory (which can occur in low-memory conditions or when     using custom allocators that simulate allocation failures), it returns NULL. The code then attempts to     call the constructor on this null pointer using placement new syntax, resulting in undefined behavior and     a Segmentation Fault. This issue has been patched in version 12.3.0. (CVE-2026-22693)

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. From 1.6.51 to 1.6.53, there is a heap buffer over-read in the     libpng simplified API function png_image_finish_read when processing interlaced 16-bit PNGs with 8-bit     output format and non-minimal row stride. This is a regression introduced by the fix for CVE-2025-65018.
    This vulnerability is fixed in 1.6.54. (CVE-2026-22695)

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. From 1.6.26 to 1.6.53, there is an integer truncation in the libpng     simplified write API functions png_write_image_16bit and png_write_image_8bit causes heap buffer over-read     when the caller provides a negative row stride (for bottom-up image layouts) or a stride exceeding 65535     bytes. The bug was introduced in libpng 1.6.26 (October 2016) by casts added to silence compiler warnings     on 16-bit systems. This vulnerability is fixed in 1.6.54. (CVE-2026-22801)

    In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize     because there is no integer overflow check for tag buffer reallocation. (CVE-2026-25210)

Tenable has extracted the preceding description block directly from the tested product 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 version of thunderbird installed on the remote host is prior to 140.7.1-1. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3171 advisory.

    HarfBuzz is a text shaping engine. Prior to version 12.3.0, a null pointer dereference vulnerability     exists in the SubtableUnicodesCache::create function located in src/hb-ot-cmap-table.hh. The function     fails to check if hb_malloc returns NULL before using placement new to construct an object at the returned     pointer address. When hb_malloc fails to allocate memory (which can occur in low-memory conditions or when     using custom allocators that simulate allocation failures), it returns NULL. The code then attempts to     call the constructor on this null pointer using placement new syntax, resulting in undefined behavior and     a Segmentation Fault. This issue has been patched in version 12.3.0. (CVE-2026-22693)

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. From 1.6.51 to 1.6.53, there is a heap buffer over-read in the     libpng simplified API function png_image_finish_read when processing interlaced 16-bit PNGs with 8-bit     output format and non-minimal row stride. This is a regression introduced by the fix for CVE-2025-65018.
    This vulnerability is fixed in 1.6.54. (CVE-2026-22695)

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. From 1.6.26 to 1.6.53, there is an integer truncation in the libpng     simplified write API functions png_write_image_16bit and png_write_image_8bit causes heap buffer over-read     when the caller provides a negative row stride (for bottom-up image layouts) or a stride exceeding 65535     bytes. The bug was introduced in libpng 1.6.26 (October 2016) by casts added to silence compiler warnings     on 16-bit systems. This vulnerability is fixed in 1.6.54. (CVE-2026-22801)

    In libexpat before 2.7.4, the doContent function does not properly determine the buffer size bufSize     because there is no integer overflow check for tag buffer reallocation. (CVE-2026-25210)

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

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

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1435 advisory.

    HarfBuzz is a text shaping engine. Prior to version 12.3.0, a null pointer dereference vulnerability     exists in the SubtableUnicodesCache::create function located in src/hb-ot-cmap-table.hh. The function     fails to check if hb_malloc returns NULL before using placement new to construct an object at the returned     pointer address. When hb_malloc fails to allocate memory (which can occur in low-memory conditions or when     using custom allocators that simulate allocation failures), it returns NULL. The code then attempts to     call the constructor on this null pointer using placement new syntax, resulting in undefined behavior and     a Segmentation Fault. This issue has been patched in version 12.3.0. (CVE-2026-22693)

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. From 1.6.51 to 1.6.53, there is a heap buffer over-read in the     libpng simplified API function png_image_finish_read when processing interlaced 16-bit PNGs with 8-bit     output format and non-minimal row stride. This is a regression introduced by the fix for CVE-2025-65018.
    This vulnerability is fixed in 1.6.54. (CVE-2026-22695)

    LIBPNG is a reference library for use in applications that read, create, and manipulate PNG (Portable     Network Graphics) raster image files. From 1.6.26 to 1.6.53, there is an integer truncation in the libpng     simplified write API functions png_write_image_16bit and png_write_image_8bit causes heap buffer over-read     when the caller provides a negative row stride (for bottom-up image layouts) or a stride exceeding 65535     bytes. The bug was introduced in libpng 1.6.26 (October 2016) by casts added to silence compiler warnings     on 16-bit systems. This vulnerability is fixed in 1.6.54. (CVE-2026-22801)

Tenable has extracted the preceding description block directly from the tested product 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 Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-2b5249b4b6 advisory.

    Merge branch 'rawhide' into f43

    ----

    Upgrade to upstream 0.032 to fix CVE-2026-22693.

Tenable has extracted the preceding description block directly from the Fedora 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 Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-2a6cbb84d6 advisory.

    Upgrade to upstream. Eliminates distributing harfbuzz sources.

    ----

    Upgrade to upstream 0.032.

Tenable has extracted the preceding description block directly from the Fedora 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 Fedora 42 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-bac983cf83 advisory.

    Backport security fix for CVE-2026-22693 (fix RHBZ#2429278)

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

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

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 / openSUSE 15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:0287-1 advisory.

    - CVE-2026-22693: Fixed a NULL pointer dereference in SubtableUnicodesCache::create (bsc#1256459).

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

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

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-2301995d0a advisory.

    Backport patch for CVE-2026-22693.

Tenable has extracted the preceding description block directly from the Fedora 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 Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-dc77eb63ae advisory.

    Backport patch for CVE-2026-22693.

Tenable has extracted the preceding description block directly from the Fedora 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 Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-b38fe572ef advisory.

    Backport security fix for CVE-2026-22693 (fix RHBZ#2429288)

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

Note that Nessus has not tested for this issue 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.

  - HarfBuzz is a text shaping engine. Prior to version 12.3.0, a null pointer dereference vulnerability     exists in the SubtableUnicodesCache::create function located in src/hb-ot-cmap-table.hh. The function     fails to check if hb_malloc returns NULL before using placement new to construct an object at the returned     pointer address. When hb_malloc fails to allocate memory (which can occur in low-memory conditions or when     using custom allocators that simulate allocation failures), it returns NULL. The code then attempts to     call the constructor on this null pointer using placement new syntax, resulting in undefined behavior and     a Segmentation Fault. This issue has been patched in version 12.3.0. (CVE-2026-22693)

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

ID	Name	Product	Family	Severity
299553	Amazon Linux 2 : firefox, --advisory ALAS2FIREFOX-2026-051 (ALASFIREFOX-2026-051)	Nessus	Amazon Linux Local Security Checks	high
299539	Amazon Linux 2 : thunderbird, --advisory ALAS2-2026-3171 (ALAS-2026-3171)	Nessus	Amazon Linux Local Security Checks	high
299525	Amazon Linux 2023 : firefox (ALAS2023-2026-1435)	Nessus	Amazon Linux Local Security Checks	high
297101	Fedora 43 : perl-HarfBuzz-Shaper (2026-2b5249b4b6)	Nessus	Fedora Local Security Checks	high
297099	Fedora 42 : perl-HarfBuzz-Shaper (2026-2a6cbb84d6)	Nessus	Fedora Local Security Checks	high
296983	Fedora 42 : harfbuzz (2026-bac983cf83)	Nessus	Fedora Local Security Checks	medium
296665	SUSE SLED15 / SLES15 / openSUSE 15 Security Update : harfbuzz (SUSE-SU-2026:0287-1)	Nessus	SuSE Local Security Checks	medium
296579	Fedora 42 : mingw-harfbuzz (2026-2301995d0a)	Nessus	Fedora Local Security Checks	medium
296548	Fedora 43 : mingw-harfbuzz (2026-dc77eb63ae)	Nessus	Fedora Local Security Checks	medium
291267	Fedora 43 : harfbuzz (2026-b38fe572ef)	Nessus	Fedora Local Security Checks	medium
282558	Linux Distros Unpatched Vulnerability : CVE-2026-22693	Nessus	Misc.	medium

Detections

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CVE-2026-22693

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