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gzseek()/gztell() read uninitialized state->past in write mode, silently corrupting output (since a4e4521)

Status: Open.

#1303 In madler/zlib;

· jxravi opened on Aug 27, 2026

deflate(Z_FINISH) returns Z_OK (not the doc-guaranteed Z_STREAM_END) when raw-deflate output exactly fills a deflateBound()-sized buffer

Status: Open.

#1300 In madler/zlib;

· JasonGross opened on Aug 24, 2026

[SECURITY] Stack buffer over-read in minizip unzGetCurrentFileInfo() — missing null termination

Status: Open.

#1299 In madler/zlib;

· thinhlx-vn opened on Aug 22, 2026

[doc] zlib.h: windowBits Z_DATA_ERROR guarantee doesn't hold for raw or gzip

Status: Open.

#1298 In madler/zlib;

· JasonGross opened on Aug 19, 2026

minizip breaks for large files under msvc if using unzOpen

Status: Open.

#1294 In madler/zlib;

· mkdev-jaugusto opened on Aug 10, 2026

Heap write past caller's buffer in gz_write()/gzputc() after non-blocking write stall

Status: Open.

#1292 In madler/zlib;

· f9j2n6nd8k-eng opened on Aug 5, 2026

gzungetc(): out-of-bounds write when output buffer state is invalid

Status: Open.

#1289 In madler/zlib;

· ydsa opened on Jul 29, 2026

crc32.c triggers -Wshorten-64-to-32 with Clang

Status: Open.

#1287 In madler/zlib;

· bmehta001 opened on Jul 28, 2026

Unchecked block size in zipRemoveExtraInfoBlock (contrib/minizip/zip.c) causes heap-buffer-overflow write

Status: Open.

#1276 In madler/zlib;

· nakata-app opened on Jul 1, 2026

contrib (minizip): potential buffer overflow in zipRemoveExtraInfoBlock

Status: Open.

#1265 In madler/zlib;

· mswilson opened on Jun 8, 2026

A logical block opening on the line closes on the line with mis-matching arguments

Status: Open.

#1264 In madler/zlib;

· ilya-fedin opened on Jun 8, 2026

Impossible to disable minizip tests when building not standalone

Status: Open.

#1263 In madler/zlib;

· ilya-fedin opened on Jun 8, 2026