diff --git a/libexec/pyenv-global b/libexec/pyenv-global
index dd9dae97..de6007f7 100755
--- a/libexec/pyenv-global
+++ b/libexec/pyenv-global
@@ -36,12 +36,16 @@ if [ -n "$versions" ]; then
   pyenv-version-file-write "$PYENV_VERSION_FILE" "${versions[@]}"
 else
   OLDIFS="$IFS"
+  # VAR=() of unquoted value does glob expansion (against the current dir's contents) after IFS-splitting
+  # which is undesired
+  set -f
   IFS=: versions=($(
     pyenv-version-file-read "$PYENV_VERSION_FILE" ||
     pyenv-version-file-read "${PYENV_ROOT}/global" ||
     pyenv-version-file-read "${PYENV_ROOT}/default" ||
     echo system
   ))
+  set +f
   IFS="$OLDIFS"
   for version in "${versions[@]}"; do
     echo "$version"
diff --git a/libexec/pyenv-local b/libexec/pyenv-local
index a44576a6..4c4e37c1 100755
--- a/libexec/pyenv-local
+++ b/libexec/pyenv-local
@@ -59,7 +59,11 @@ elif [ -n "$versions" ]; then
   pyenv-version-file-write ${FORCE:+-f }.python-version "${versions[@]}"
 else
   if version_file="$(pyenv-version-file "$PWD")"; then
+    # VAR=() of unquoted value does glob expansion (against the current dir's contents) after IFS-splitting
+    # which is undesired
+    set -f
     IFS=: versions=($(pyenv-version-file-read "$version_file"))
+    set +f
     for version in "${versions[@]}"; do
       echo "$version"
     done
diff --git a/libexec/pyenv-prefix b/libexec/pyenv-prefix
index 65bc5425..f42bd660 100755
--- a/libexec/pyenv-prefix
+++ b/libexec/pyenv-prefix
@@ -28,6 +28,9 @@ fi
 PYENV_PREFIX_PATHS=()
 OLDIFS="$IFS"
 { IFS=:
+  # Unquoted $VAR does glob expansion (against the current dir's contents) after IFS-splitting
+  # which is undesired
+  set -f
   for version in ${PYENV_VERSION}; do
     if [ "$version" = "system" ]; then
       if PYTHON_PATH="$(PYENV_VERSION="${version}" pyenv-which python --skip-advice 2>/dev/null)" || \
@@ -52,6 +55,7 @@ OLDIFS="$IFS"
       exit 1
     fi
   done
+  set +f
 }
 IFS="$OLDIFS"
 
diff --git a/libexec/pyenv-version b/libexec/pyenv-version
index 75e2287c..a2ad8e7e 100755
--- a/libexec/pyenv-version
+++ b/libexec/pyenv-version
@@ -9,7 +9,11 @@ set -e
 
 exitcode=0
 OLDIFS="$IFS"
+# VAR=() of unquoted value does glob expansion (against the current dir's contents) after IFS-splitting
+# which is undesired
+set -f
 IFS=: PYENV_VERSION_NAMES=($(pyenv-version-name)) || exitcode=$?
+set +f
 IFS="$OLDIFS"
 
 unset bare
diff --git a/libexec/pyenv-version-name b/libexec/pyenv-version-name
index f7c57efb..4430f8ed 100755
--- a/libexec/pyenv-version-name
+++ b/libexec/pyenv-version-name
@@ -46,6 +46,9 @@ versions=()
 OLDIFS="$IFS"
 { IFS=:
   any_not_installed=0
+  # Unquoted $VAR does glob expansion (against the current dir's contents) after IFS-splitting
+  # which is undesired
+  set -f
   for version in ${PYENV_VERSION}; do
     # Remove the explicit 'python-' prefix from versions like 'python-3.12'.
     normalised_version="${version#python-}"
@@ -66,6 +69,7 @@ OLDIFS="$IFS"
       fi
     fi
   done
+  set +f
 }
 IFS="$OLDIFS"
 
diff --git a/libexec/pyenv-versions b/libexec/pyenv-versions
index bfd67c70..91cb56d4 100755
--- a/libexec/pyenv-versions
+++ b/libexec/pyenv-versions
@@ -99,6 +99,9 @@ else
   miss_prefix="  "
   OLDIFS="$IFS"
   IFS=:
+  # VAR=() of unquoted value does glob expansion (against the current dir's contents) after IFS-splitting
+  # which is undesired
+  set -f
   if ((${BASH_VERSINFO[0]} > 3)); then
     for i in $(pyenv-version-name || true); do
       current_versions["$i"]="1"
@@ -106,6 +109,7 @@ else
   else
     current_versions=($(pyenv-version-name || true))
   fi
+  set +f
   IFS="$OLDIFS"
   include_system="1"
 fi
@@ -161,11 +165,15 @@ versions_dir_entries=("$versions_dir"/*)
 if sort --version-sort </dev/null >/dev/null 2>&1; then
     # system sort supports version sorting
     OLDIFS="$IFS"
+    # VAR=() of unquoted value does glob expansion (against the current dir's contents) after IFS-splitting
+    # which is undesired
+    set -f
     IFS=$'\n'
     versions_dir_entries=($(
         printf "%s\n" "${versions_dir_entries[@]}" |
         sort --version-sort
     ))
+    set +f
     IFS="$OLDIFS"
 fi
 
diff --git a/libexec/pyenv-which b/libexec/pyenv-which
index 4cdcfeb0..1bc6ed0e 100755
--- a/libexec/pyenv-which
+++ b/libexec/pyenv-which
@@ -63,7 +63,11 @@ if [ -z "$PYENV_COMMAND" ]; then
 fi
 
 OLDIFS="$IFS"
+# Unquoted $VAR or VAR=() of unquoted value does glob expansion (against the current dir's contents)
+# after IFS-splitting which is undesired
+set -f
 IFS=: versions=(${PYENV_VERSION:-$(pyenv-version-name -f)})
+set +f
 IFS="$OLDIFS"
 
 declare -a nonexistent_versions
diff --git a/test/global.bats b/test/global.bats
index 62870b3e..be67987d 100644
--- a/test/global.bats
+++ b/test/global.bats
@@ -16,6 +16,14 @@ load test_helper
   assert_output "1.2.3"
 }
 
+@test "version with glob characters is handled correctly" {
+  touch 1.1
+  mkdir -p "$PYENV_ROOT"
+  echo "[1-9].?*" > "$PYENV_ROOT/version"
+  run pyenv-global
+  assert_success "[1-9].?*"
+}
+
 @test "set PYENV_ROOT/version" {
   mkdir -p "$PYENV_ROOT/versions/1.2.3"
   run pyenv-global "1.2.3"
diff --git a/test/local.bats b/test/local.bats
index 98639673..74d02e8a 100644
--- a/test/local.bats
+++ b/test/local.bats
@@ -19,6 +19,13 @@ _setup() {
   assert_success "1.2.3"
 }
 
+@test "version with glob characters is handled correctly" {
+  touch 1.1
+  echo "[1-9].?*" > .python-version
+  run pyenv-local
+  assert_success "[1-9].?*"
+}
+
 @test "discovers version file in parent directory" {
   echo "1.2.3" > .python-version
   mkdir -p "subdir" && cd "subdir"
diff --git a/test/prefix.bats b/test/prefix.bats
index f52e520d..3a6bfb6a 100644
--- a/test/prefix.bats
+++ b/test/prefix.bats
@@ -16,6 +16,12 @@ load test_helper
   assert_failure "pyenv: version \`1.2.3' not installed"
 }
 
+@test "version with glob characters is handled correctly" {
+  touch 1.1
+  PYENV_VERSION="[1-9].?*" run pyenv-prefix
+  assert_failure "pyenv: version \`[1-9].?*' not installed"
+}
+
 @test "prefix for system" {
   mkdir -p "${PYENV_TEST_DIR}/bin"
   touch "${PYENV_TEST_DIR}/bin/python"
diff --git a/test/version-name.bats b/test/version-name.bats
index cc179b97..95afded8 100644
--- a/test/version-name.bats
+++ b/test/version-name.bats
@@ -22,6 +22,14 @@ _setup() {
   assert_success "system"
 }
 
+@test "version with glob characters is handled correctly" {
+  touch 1.1
+  PYENV_VERSION="[1-9].?*" run pyenv-version-name
+  assert_failure <<'!'
+pyenv: version `[1-9].?*' is not installed (set by PYENV_VERSION environment variable)
+!
+}
+
 @test "PYENV_VERSION can be overridden by hook" {
   create_version "2.7.11"
   create_version "3.5.1"
diff --git a/test/version.bats b/test/version.bats
index a311b62f..25623413 100644
--- a/test/version.bats
+++ b/test/version.bats
@@ -79,3 +79,12 @@ OUT
 3.3.3
 OUT
 }
+
+@test "version with glob characters is handled correctly" {
+  touch 1.1
+  PYENV_VERSION="[1-9].?*" run pyenv-version
+  assert_failure
+  assert_output <<OUT
+pyenv: version \`[1-9].?*' is not installed (set by PYENV_VERSION environment variable)
+OUT
+}
diff --git a/test/versions.bats b/test/versions.bats
index 07acc4f6..ddf1e4cc 100644
--- a/test/versions.bats
+++ b/test/versions.bats
@@ -63,6 +63,18 @@ OUT
   assert_success "3.3"
 }
 
+@test "version with glob characters is handled correctly" {
+  stub_system_python
+  create_version "[1-9].?*"
+  touch 1.1
+  run pyenv-versions
+  assert_success
+  assert_output <<OUT
+* system (set by ${PYENV_ROOT}/version)
+  [1-9].?*
+OUT
+}
+
 @test "multiple versions and envs" {
   stub_system_python
   create_version "2.7.6"
diff --git a/test/which.bats b/test/which.bats
index 7cade25b..60293348 100644
--- a/test/which.bats
+++ b/test/which.bats
@@ -90,6 +90,17 @@ Note: See 'pyenv help global' for tips on allowing multiple
 OUT
 }
 
+@test "version with glob characters is handled correctly" {
+  bats_require_minimum_version 1.5.0
+  touch 1.1
+  PATH="$(path_without foo)" PYENV_VERSION="[1-9].?*" run -127 pyenv-which foo
+  assert_failure
+  assert_output <<!
+pyenv: version \`[1-9].?*' is not installed (set by PYENV_VERSION environment variable)
+pyenv: foo: command not found
+!
+}
+
 @test "no executable found" {
   bats_require_minimum_version 1.5.0
   create_alt_executable_in_version "2.7" "py.test"