diff --git a/.wolf/buglog.json b/.wolf/buglog.json
index f5847580..3fd00f9f 100644
--- a/.wolf/buglog.json
+++ b/.wolf/buglog.json
@@ -18040,6 +18040,26 @@
       "related_bugs": [],
       "occurrences": 2,
       "last_seen": "2026-08-21T08:56:00Z"
+    },
+    {
+      "id": "bug-1615",
+      "timestamp": "2026-08-21T09:37:18Z",
+      "error_message": "src/tools/test-dirty-fingerprint-distinguishability.sh: line 344: iso_src: unbound variable",
+      "file": "src/tools/test-dirty-fingerprint-distinguishability.sh",
+      "root_cause": "capture_version()'s `local iso_src=\"$1\" binary=\"$iso_src/$BUILD_DIR_NAME/scheduler/xce_scheduler\"` put two assignments in ONE `local` statement where the second referenced the first. Bash expands every word of a single `local` command before ANY of that command's assignments take effect, so `$iso_src` in the second word's value expanded against the OLD (not-yet-declared) `iso_src`, which under `set -u` is an unbound-variable error rather than silently empty.",
+      "fix": "Split into two separate `local` statements (`local iso_src=\"$1\"` then `local binary=\"$iso_src/...\"` on its own line) so the second statement's expansion happens after the first has already taken effect. Confirmed via `bash -n` plus two full real end-to-end script runs (both exit 0, byte-identical fingerprints reproduced across runs) after the fix.",
+      "tags": [
+        "bash",
+        "set-u",
+        "local",
+        "unbound-variable",
+        "dirty-content-fingerprint",
+        "task-6.1",
+        "src/tools"
+      ],
+      "related_bugs": [],
+      "occurrences": 1,
+      "last_seen": "2026-08-21T09:37:18Z"
     }
   ]
 }