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CVE-2021-45340: libsixel, backport upstream fix (no version bump) #28

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CVE-2021-45340: libsixel, backport upstream fix (no version bump) #28

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e5ebcb2
trace-pr anchor
Sep 5, 2026
5569578
libsixel: 1.10.3 (fix CVE-2021-45340)
Sep 5, 2026
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12 changes: 12 additions & 0 deletions pkgs/by-name/li/libsixel/fix-CVE-2021-45340.patch
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Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@
diff --git a/src/stb_image.h b/src/stb_image.h
index f12c30b..526281c 100644
--- a/src/stb_image.h
+++ b/src/stb_image.h
@@ -1534,6 +1534,7 @@ static unsigned char *stbi__convert_format(unsigned char *data, int img_n, int r
int i,j;
unsigned char *good;

+ if (data == NULL) return data;
if (req_comp == img_n) return data;
STBI_ASSERT(req_comp >= 1 && req_comp <= 4);

2 changes: 2 additions & 0 deletions pkgs/by-name/li/libsixel/package.nix
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Expand Up @@ -19,6 +19,8 @@ stdenv.mkDerivation rec {
sha256 = "1nny4295ipy4ajcxmmh04c796hcds0y7z7rv3qd17mj70y8j0r2d";
};

patches = [ ./fix-CVE-2021-45340.patch ];

buildInputs = [
gdk-pixbuf
gd
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