| Name | CVE-2019-20056 |
| Description | stb_image.h (aka the stb image loader) 2.23, as used in libsixel and other products, has an assertion failure in stbi__shiftsigned. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| Debian Bugs | 948103, 1014711 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| libsixel (PTS) | bullseye | 1.8.6-2 | fixed |
| sid, trixie, bookworm | 1.10.3-3 | fixed |
| libstb (PTS) | bullseye | 0.0~git20200713.b42009b+ds-1 | vulnerable |
| bookworm | 0.0~git20220908.8b5f1f3+ds-1 | fixed |
| sid, trixie | 0.0~git20240715.f7f20f39fe4f+ds-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| libsixel | source | (unstable) | 1.8.6-1 | low | | 948103 |
| libstb | source | (unstable) | 0.0~git20220908.8b5f1f3+ds-1 | low | | 1014711 |
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