GHSA-2mhw-8qcg-gr96

skia-python vendors vulnerable libfreetype because of pinned cibuildwheel version

8.1 HighFix available

Impact

The Linux wheels for skia-python vendor a vulnerable version of libfreetype that is affected by CVE-2025-27363 [1].

The root cause is a chain of unfortunate events:

skia-python builds wheels using pinned pypa/cibuildwheel@2.21.3 [2]
cibuildwheel 2.21.3 in turn pins manylinux container images [3]
In these images, version 2.9.1-9.el8 of RedHat package freetype is preinstalled. This package version is vulnerable and has since been patched in 2.9.1-10.
During the skia-python Linux build, libfreetype is vendored from the system, resulting in skia-python.libs/libfreetype-29a7443c.so.6.16.1

[ To find the provenance of your vendored libfreetype, we extracted the 8-character hash of the original binary file that is added during the build process (29a7443c), and matched it against our database of hashes all historic Red Hat, Debian and Ubuntu releases of freetype. ]

Because freetype is only a transitive dependency of the packages explicitly installed by the build script [4], it is not upgraded to the patched version [4].
As a result, the published wheels embed a vulnerable libfreetype, even though patched packages are available upstream.

This appears to be a broader manylinux ecosystem issue. The base images do not enforce that yum update runs on container start, so preinstalled libraries may remain vulnerable indefinitely.

Patches

In the case of skia-python, the solution is to explicitly install freetype in the build process and rebuild the wheels.

The original report was suggesting the above, but in the current build_Linux.sh script, the patched freetype-devel version 2.9.1-10 gets installed as a dependency. It's just that we need to rebuild the wheel for a new release.

Workarounds

Users must upgrade the wheel package after release.

References

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

What each source reports

GitHub Advisories Score used8.1

skia-python vendors vulnerable libfreetype because of pinned cibuildwheel version

Impact

The Linux wheels for skia-python vendor a vulnerable version of libfreetype that is affected by CVE-2025-27363 [1].

The root cause is a chain of unfortunate events:

skia-python builds wheels using pinned pypa/cibuildwheel@2.21.3 [2]
cibuildwheel 2.21.3 in turn pins manylinux container images [3]
In these images, version 2.9.1-9.el8 of RedHat package freetype is preinstalled. This package version is vulnerable and has since been patched in 2.9.1-10.
During the skia-python Linux build, libfreetype is vendored from the system, resulting in skia-python.libs/libfreetype-29a7443c.so.6.16.1

Because freetype is only a transitive dependency of the packages explicitly installed by the build script [4], it is not upgraded to the patched version [4].
As a result, the published wheels embed a vulnerable libfreetype, even though patched packages are available upstream.

This appears to be a broader manylinux ecosystem issue. The base images do not enforce that yum update runs on container start, so preinstalled libraries may remain vulnerable indefinitely.

Patches

In the case of skia-python, the solution is to explicitly install freetype in the build process and rebuild the wheels.

Workarounds

Users must upgrade the wheel package after release.

References

Record: GHSA-2mhw-8qcg-gr96
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-787, CWE-1395
Updated: 2026-11-02

OSV8.1

skia-python vendors vulnerable libfreetype because of pinned cibuildwheel version

Impact

The Linux wheels for skia-python vendor a vulnerable version of libfreetype that is affected by CVE-2025-27363 [1].

The root cause is a chain of unfortunate events:

skia-python builds wheels using pinned pypa/cibuildwheel@2.21.3 [2]
cibuildwheel 2.21.3 in turn pins manylinux container images [3]
In these images, version 2.9.1-9.el8 of RedHat package freetype is preinstalled. This package version is vulnerable and has since been patched in 2.9.1-10.
During the skia-python Linux build, libfreetype is vendored from the system, resulting in skia-python.libs/libfreetype-29a7443c.so.6.16.1

Because freetype is only a transitive dependency of the packages explicitly installed by the build script [4], it is not upgraded to the patched version [4].
As a result, the published wheels embed a vulnerable libfreetype, even though patched packages are available upstream.

This appears to be a broader manylinux ecosystem issue. The base images do not enforce that yum update runs on container start, so preinstalled libraries may remain vulnerable indefinitely.

Patches

In the case of skia-python, the solution is to explicitly install freetype in the build process and rebuild the wheels.

Workarounds

Users must upgrade the wheel package after release.

References

Record: GHSA-2mhw-8qcg-gr96
CVSS 3.1: 8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-1395, CWE-787
Updated: 2026-11-02

Affected packages

Affected packages
Package	Affected	Fixed
`skia-python` PyPI	144.0 to 144.0	None known
`skia-python` PyPI	through 138.0	144.0.post1
`skia-python` PyPI	Listed versions 144.0	None known
`skia-python` PyPI	before 144.0.post1, plus listed versions 0.0.30.0.40.0.50.0.6116.0b2 Show 28 moreShow less 117.0b3119.0b4120.0b5121.0b6124.0b7126.0b8128.0b9130.0b10132.0b11134.0b12136.0b13138.0138.0rc1144.085.086.086.187.087.187.287.387.487.587.687.787.887.987.9rc1	144.0.post1

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	GitHub Advisories, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

GHSA-2mhw-8qcg-gr96 is a high vulnerability (CVSS 8.1) in skia-python, published March 19, 2026. No source lists public exploit code. Fixed in skia-python 144.0.post1.