CVE-2025-27363

An out of bounds write exists in FreeType versions 2.13.0 and below (newer versions of FreeType are not vulnerable) when attempting to parse font subglyph structures related to TrueType GX and variable font files. The vulnerable code assigns a signed short value to an unsigned long and then adds a static value causing it to wrap around and allocate too small of a heap buffer. The code then writes up to 6 signed long integers out of bounds relative to this buffer. This may result in arbitrary code execution. This vulnerability may have been exploited in the wild.

An out of bounds write exists in FreeType versions 2.13.0 and below (newer versions of FreeType are not vulnerable) when attempting to parse font subglyph structures related to TrueType GX and variable font files. The vulnerable code assigns a signed short value to an unsigned long and then adds a static value causing it to wrap around and allocate too small of a heap buffer. The code then writes up to 6 signed long integers out of bounds relative to this buffer. This may result in arbitrary code execution. This vulnerability may have been exploited in the wild.

An out of bounds write exists in FreeType versions 2.13.0 and below (newer versions of FreeType are not vulnerable) when attempting to parse font subglyph structures related to TrueType GX and variable font files. The vulnerable code assigns a signed short value to an unsigned long and then adds a static value causing it to wrap around and allocate too small of a heap buffer. The code then writes up to 6 signed long integers out of bounds relative to this buffer. This may result in arbitrary code execution. This vulnerability may have been exploited in the wild.

An out of bounds write exists in FreeType versions 2.13.0 and below (newer versions of FreeType are not vulnerable) when attempting to parse font subglyph structures related to TrueType GX and variable font files. The vulnerable code assigns a signed short value to an unsigned long and then adds a static value causing it to wrap around and allocate too small of a heap buffer. The code then writes up to 6 signed long integers out of bounds relative to this buffer. This may result in arbitrary code execution. This vulnerability may have been exploited in the wild.

FreeType is written in C, designed to be small,efficient, highly customizable, and portable while capable of producing high-quality output (glyph images) of most vector and bitmap font formats

Security Fix(es):

An out of bounds write exists in FreeType versions 2.13.0 and below (newer versions of FreeType are not vulnerable) when attempting to parse font subglyph structures related to TrueType GX and variable font files. The vulnerable code assigns a signed short value to an unsigned long and then adds a static value causing it to wrap around and allocate too small of a heap buffer. The code then writes up to 6 signed long integers out of bounds relative to this buffer. This may result in arbitrary code execution. This vulnerability may have been exploited in the wild.(CVE-2025-27363)

FreeType is a free, high-quality, portable font engine that can open and manage font files. FreeType loads, hints, and renders individual glyphs efficiently.

Security Fix(es):

• freetype: OOB write when attempting to parse font subglyph structures related to TrueType GX and variable font files (CVE-2025-27363)

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.

FreeType is a free, high-quality, portable font engine that can open and manage font files. FreeType loads, hints, and renders individual glyphs efficiently.

Security Fix(es):

• freetype: OOB write when attempting to parse font subglyph structures related to TrueType GX and variable font files (CVE-2025-27363)

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.

MinGW Windows Freetype library.

Security Fix(es):

• freetype: OOB write when attempting to parse font subglyph structures related to TrueType GX and variable font files (CVE-2025-27363)

• libsoup: Integer overflow in append_param_quoted (CVE-2025-32050)

• libsoup: Heap buffer overflow in sniff_unknown() (CVE-2025-32052)

• libsoup: Heap buffer overflows in sniff_feed_or_html() and skip_insignificant_space() (CVE-2025-32053)

• libsoup: Out of bounds reads in soup_headers_parse_request() (CVE-2025-32906)

• libsoup: Denial of service in server when client requests a large amount of overlapping ranges with Range header (CVE-2025-32907)

• libsoup: NULL Pointer Dereference on libsoup through function "sniff_mp4" in soup-content-sniffer.c (CVE-2025-32909)

• libsoup: Null pointer deference on libsoup via /auth/soup-auth-digest.c through "soup_auth_digest_authenticate" on client when server omits the "realm" parameter in an Unauthorized response with Digest authentication (CVE-2025-32910)

• libsoup: Double free on soup_message_headers_get_content_disposition() through "soup-message-headers.c" via "params" GHashTable value (CVE-2025-32911)

• libsoup: NULL pointer dereference in soup_message_headers_get_content_disposition when "filename" parameter is present, but has no value in Content-Disposition header (CVE-2025-32913)

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.

Root has patched CVE-2025-27363 in the freetype package for Root:Alpine:3.15. Multiple fixed versions available.

An out of bounds write exists in FreeType versions 2.13.0 and below (newer versions of FreeType are not vulnerable) when attempting to parse font subglyph structures related to TrueType GX and variable font files. The vulnerable code assigns a signed short value to an unsigned long and then adds a static value causing it to wrap around and allocate too small of a heap buffer. The code then writes up to 6 signed long integers out of bounds relative to this buffer. This may result in arbitrary code execution. This vulnerability may have been exploited in the wild.

FreeType is a free, high-quality, portable font engine that can open and manage font files. FreeType loads, hints, and renders individual glyphs efficiently.

Security Fix(es):

• freetype: OOB write when attempting to parse font subglyph structures related to TrueType GX and variable font files (CVE-2025-27363)

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.

MinGW Windows Freetype library.

Security Fix(es):

• freetype: OOB write when attempting to parse font subglyph structures related to TrueType GX and variable font files (CVE-2025-27363)
• libsoup: Integer overflow in append_param_quoted (CVE-2025-32050)
• libsoup: Heap buffer overflow in sniff_unknown() (CVE-2025-32052)
• libsoup: Heap buffer overflows in sniff_feed_or_html() and skip_insignificant_space() (CVE-2025-32053)
• libsoup: Out of bounds reads in soup_headers_parse_request() (CVE-2025-32906)
• libsoup: Denial of service in server when client requests a large amount of overlapping ranges with Range header (CVE-2025-32907)
• libsoup: NULL Pointer Dereference on libsoup through function "sniff_mp4" in soup-content-sniffer.c (CVE-2025-32909)
• libsoup: Null pointer deference on libsoup via /auth/soup-auth-digest.c through "soup_auth_digest_authenticate" on client when server omits the "realm" parameter in an Unauthorized response with Digest authentication (CVE-2025-32910)
• libsoup: Double free on soup_message_headers_get_content_disposition() through "soup-message-headers.c" via "params" GHashTable value (CVE-2025-32911)
• libsoup: NULL pointer dereference in soup_message_headers_get_content_disposition when "filename" parameter is present, but has no value in Content-Disposition header (CVE-2025-32913)

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.

In load_truetype_glyph of ttgload.c, there is a possible out of bounds write due to an integer overflow. This could lead to local code execution with no additional execution privileges needed. User interaction is not needed for exploitation.

• CVE-2025-27363: fix OOB write when parsing font subglyph structures

• CVE-2025-27363: fix out of bounds write in font subglyph structures parsing

• CVE-2025-27363: fix OOB write when parsing font subglyph structures

• CVE-2025-27363: fix OOB write when parsing font subglyph structures

• SECURITY UPDATE: out-of-bounds write when parsing composite subglyphs of TrueType GX / variable fonts (ELSCVE-171535)
  • debian/patches-freetype/CVE-2025-27363.patch: reject a subglyph count that truncates to a negative short in load_truetype_glyph before it is used to size the outline arrays in src/truetype/ttgload.c.
  • CVE-2025-27363

An out of bounds write exists in FreeType versions 2.13.0 and below when attempting to parse font subglyph structures related to TrueType GX and variable font files which may result in arbitrary code execution.

This update for freetype2 fixes the following issues:

• CVE-2025-27363: Fixed out-of-bounds write when attempting to parse font subglyph structures related to TrueType GX and variable font files (bsc#1239465).

This update for freetype2 fixes the following issues:

• CVE-2025-27363: Fixed out-of-bounds write when attempting to parse font subglyph structures related to TrueType GX and variable font files (bsc#1239465).

It was discovered that FreeType incorrectly handled certain memory operations when parsing font subglyph structures. A remote attacker could use this issue to cause FreeType to crash, resulting in a denial of service, or possibly execute arbitrary code.

USN-7352-1 fixed a vulnerability in FreeType. This update provides the corresponding updates for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. This update also fixes an additional vulnerability in Ubuntu 14.04 LTS.

Original advisory details:

It was discovered that FreeType incorrectly handled certain memory operations when parsing font subglyph structures. A remote attacker could use this issue to cause FreeType to crash, resulting in a denial of service, or possibly execute arbitrary code. This issue only affected Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. (CVE-2025-27363)

Additional advisory details:

It was discovered that FreeType incorrectly handled certain memory operations during typical execution. An attacker could possibly use this issue to cause FreeType to crash, resulting in a denial of service. This issue only affected Ubuntu 14.04 LTS. (CVE-2022-27406)