CVE-2019-20056

NameCVE-2019-20056
Descriptionstb_image.h (aka the stb image loader) 2.23, as used in libsixel and other products, has an assertion failure in stbi__shiftsigned.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs948103, 1014711

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
libsixel (PTS)bullseye1.8.6-2fixed
sid, trixie, bookworm1.10.3-3fixed
libstb (PTS)bullseye0.0~git20200713.b42009b+ds-1vulnerable
bookworm0.0~git20220908.8b5f1f3+ds-1fixed
sid, trixie0.0~git20230129.5736b15+ds-1.2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
libsixelsource(unstable)1.8.6-1low948103
libstbsource(unstable)0.0~git20220908.8b5f1f3+ds-1low1014711

Notes

[buster] - libsixel <no-dsa> (Minor issue)
[stretch] - libsixel <no-dsa> (Minor issue)
[jessie] - libsixel <no-dsa> (Minor issue)
[bullseye] - libstb <no-dsa> (Minor issue)
[buster] - libstb <no-dsa> (Minor issue)
libsixel PR: https://github.com/saitoha/libsixel/issues/126
libsixel patch: https://github.com/saitoha/libsixel/commit/814f831555ea2492d442e784ab5d594f6a8e2e8d
libstb PR: https://github.com/nothings/stb/issues/886
libstb patch: https://github.com/nothings/stb/commit/bfaccab17a648b315543d366c63aee575a0756b7
Fix might cause a regression:
https://github.com/nothings/stb/pull/960#pullrequestreview-615017993

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