@@ -85,8 +85,8 @@ for it, so no report field carries a zone the evidence never had.
 - zstd-compressed SquashFS and UBIFS need Python 3.14 or later
   (`compression.zstd`), which the builds made by `test_builds.yml` use. Run from
   source on an older Python, a zstd SquashFS is listed as a volume with no files,
-  and the run log does not say why; a zstd-compressed UBIFS file is listed and
-  not staged, and the log names the reason.
+  and the run log gives the reason on that volume's line; a zstd-compressed UBIFS
+  file is listed and not staged, and the log names the reason.
 - An encrypted volume (Android file-based encryption, iOS data protection,
   FileVault, BitLocker) reads, but its names or contents are ciphertext.
 
 
@@ -43,7 +43,7 @@
     except ImportError:
         ewfprobe = None
 
-QNXPROBE_VERSION = "1.33"
+QNXPROBE_VERSION = "1.34"
 
 QNX6_MAGIC     = 0x68191122
 BOOTBLOCK_SIZE = 0x2000
@@ -5818,6 +5818,13 @@ def lz4_block_decompress(src, limit=None):
     return bytes(out)
 
 
+# What a zstd SquashFS says on a Python with no zstd. identify_fs() reports it
+# among its lines and the walker carries it as its note, which volumes() passes
+# on, so a listing that comes back empty says why wherever the volume is shown.
+SQUASHFS_NO_ZSTD_NOTE = ("zstd compressed; this Python has no zstd (3.14 adds it), so "
+                         "the listing may be short and no file can be read")
+
+
 def _zstd_module():
     try:
         from compression import zstd              # Python 3.14 and later
@@ -6078,6 +6085,15 @@ def readlink(self, ref):
         ino = self.inode(ref)
         return ino.get("target", b"").decode("utf-8", "surrogateescape")
 
+    @property
+    def note(self):
+        """Why this volume cannot be read on this Python, or None. listdir()
+        answers an empty list when its directory table cannot be decompressed,
+        so volumes() carries this beside the volume to say why."""
+        if self.comp == 6 and _zstd_module() is None:
+            return SQUASHFS_NO_ZSTD_NOTE
+        return None
+
     def listdir(self, ref):
         try:
             ino = self.inode(ref)
@@ -6201,8 +6217,7 @@ def identify_squashfs(fh, base, size=None):
         lines.append(f"note         the image records {human(w.bytes_used)} but the region "
                      f"holds {human(size)}, so its end is missing")
     if w.comp == 6 and _zstd_module() is None:
-        lines.append("note         zstd compressed; this Python has no zstd (3.14 adds "
-                     "it), so the listing may be short and no file can be read")
+        lines.append("note         " + SQUASHFS_NO_ZSTD_NOTE)
     if not root_ok:
         if w.comp == 6 and _zstd_module() is None:
             return "squashfs", lines
@@ -9343,6 +9358,12 @@ def volumes(fh, size=None):
             vol["note"] = f"contents not read: {exc}"
         except Exception as exc:
             vol["note"] = f"could not walk this filesystem: {exc}"
+        # A walker that is built but cannot read its volume here says why, for
+        # a zstd SquashFS on a Python without zstd, whose listing comes back
+        # empty rather than raising.
+        wnote = getattr(vol.get("walker"), "note", None)
+        if wnote and "note" not in vol:
+            vol["note"] = wnote
         out.append(vol)
     return out
 
@@ -13039,6 +13060,35 @@ def _vol_view(path):
                "--oob while mounted, against the kernel's own read-back"),
               ("ubi-nand-history", "ubi", "ubi-nand.history.kernel.sha256", None, "stat", "",
                (), "a static UBI volume the kernel wrote with ubiupdatevol, from the same image")]
+        # A zstd SquashFS on a Python with no zstd lists nothing, since its
+        # directory tables are compressed too, and the walker answers an empty
+        # listing rather than raising. volumes() has to say why beside the
+        # volume, or it reads as an empty filesystem. The missing module is
+        # simulated, so this runs on every Python.
+        zst_img = os.path.join(fx, "squashfs-zstd.img.gz")
+        if not os.path.isfile(zst_img):
+            print("  [SKIP] squashfs-zstd is not beside this script, so the note a "
+                  "Python without zstd gives was not checked")
+        else:
+            with gzip.open(zst_img, "rb") as gz:
+                zst_bytes = gz.read()
+            zst_globals = globals()
+            zst_real = zst_globals["_zstd_module"]
+            try:
+                zst_globals["_zstd_module"] = lambda: None
+                zst_hidden = volumes(io.BytesIO(zst_bytes), len(zst_bytes))
+            finally:
+                zst_globals["_zstd_module"] = zst_real
+            zst_shown = volumes(io.BytesIO(zst_bytes), len(zst_bytes))
+            zst_cond = (len(zst_hidden) == 1 and zst_hidden[0]["kind"] == "squashfs"
+                        and zst_hidden[0].get("note") == SQUASHFS_NO_ZSTD_NOTE
+                        and len(zst_shown) == 1
+                        and (zst_shown[0].get("note") is None) == (zst_real() is not None))
+            if not zst_cond:
+                ok = False
+            print(f"  [{'PASS' if zst_cond else 'FAIL'}] a zstd SquashFS on a Python "
+                  f"without zstd carries a note saying why it lists nothing, and none "
+                  f"where zstd is present")
         for stem, want_kind, hashes, listing, style, prefix, loose, label in sq + jf + ub + ya + kh:
             img = os.path.join(fx, stem + ".img.gz")
             if not (os.path.isfile(img) and os.path.isfile(os.path.join(fx, hashes))):
 
@@ -3,12 +3,12 @@
     {
       "path": "scripts/vendor/qnxprobe.py",
       "name": "qnxprobe",
-      "version": "1.33",
+      "version": "1.34",
       "upstream": "https://github.com/abrignoni/qnxprobe",
       "upstream_file": "qnxprobe.py",
-      "commit": "e9bfb69e2d1556df67d5f1f8301dcf6f9a351749",
-      "commit_date": "2026-09-25T15:29:51-04:00",
-      "sha256": "15924af48c61fffb3fbbb1a7a8547f102341263d27970c58f71fba98df7bcdc8",
+      "commit": "fc74ca829c2773879243b326f2262c29f462df3a",
+      "commit_date": "2026-09-25T16:01:32-04:00",
+      "sha256": "ab0f681313bc305f3662d4421199f45da357da3becf90b28696a158fbaae2710",
       "licence": "MIT",
       "licence_file": "scripts/vendor/LICENSE-qnxprobe",
       "note": "Copied verbatim. Fix upstream and re-vendor; edits here are reverted by the next sync."