diff --git a/modules/auth/repo_form.go b/modules/auth/repo_form.go
index 8d10fc1570d3..a9985fdcbc8c 100644
--- a/modules/auth/repo_form.go
+++ b/modules/auth/repo_form.go
@@ -499,9 +499,9 @@ func (f SubmitReviewForm) HasEmptyContent() bool {
 
 // NewReleaseForm form for creating release
 type NewReleaseForm struct {
-	TagName    string `binding:"Required;GitRefName"`
-	Target     string `form:"tag_target" binding:"Required"`
-	Title      string `binding:"Required"`
+	TagName    string `binding:"Required;GitRefName;MaxSize(255)"`
+	Target     string `form:"tag_target" binding:"Required;MaxSize(255)"`
+	Title      string `binding:"Required;MaxSize(255)"`
 	Content    string
 	Draft      string
 	Prerelease bool
@@ -515,7 +515,7 @@ func (f *NewReleaseForm) Validate(ctx *macaron.Context, errs binding.Errors) bin
 
 // EditReleaseForm form for changing release
 type EditReleaseForm struct {
-	Title      string `form:"title" binding:"Required"`
+	Title      string `form:"title" binding:"Required;MaxSize(255)"`
 	Content    string `form:"content"`
 	Draft      string `form:"draft"`
 	Prerelease bool   `form:"prerelease"`
diff --git a/templates/repo/issue/labels.tmpl b/templates/repo/issue/labels.tmpl
index 956fc955a034..176304278fa6 100644
--- a/templates/repo/issue/labels.tmpl
+++ b/templates/repo/issue/labels.tmpl
@@ -17,16 +17,16 @@
 					<div class="ui grid">
 						<div class="three wide column">
 							<div class="ui small input">
-								<input class="new-label-input emoji-input" name="title" placeholder="{{.i18n.Tr "repo.issues.new_label_placeholder"}}" autofocus required>
+								<input class="new-label-input emoji-input" name="title" placeholder="{{.i18n.Tr "repo.issues.new_label_placeholder"}}" autofocus required maxlength="50">
 							</div>
 						</div>
 						<div class="five wide column">
 							<div class="ui small fluid input">
-								<input class="new-label-desc-input" name="description" placeholder="{{.i18n.Tr "repo.issues.new_label_desc_placeholder"}}">
+								<input class="new-label-desc-input" name="description" placeholder="{{.i18n.Tr "repo.issues.new_label_desc_placeholder"}}" maxlength="200">
 							</div>
 						</div>
 						<div class="color picker column">
-							<input class="color-picker" name="color" value="#70c24a" required>
+							<input class="color-picker" name="color" value="#70c24a" required maxlength="7">
 						</div>
 						<div class="column precolors">
 							{{template "repo/issue/label_precolors"}}
@@ -151,16 +151,16 @@
 				<div class="ui grid">
 					<div class="three wide column">
 						<div class="ui small input">
-							<input class="new-label-input emoji-input" name="title" placeholder="{{.i18n.Tr "repo.issues.new_label_placeholder"}}" autofocus required>
+							<input class="new-label-input emoji-input" name="title" placeholder="{{.i18n.Tr "repo.issues.new_label_placeholder"}}" autofocus required maxlength="50">
 						</div>
 					</div>
 					<div class="five wide column">
 						<div class="ui small fluid input">
-							<input class="new-label-desc-input" name="description" placeholder="{{.i18n.Tr "repo.issues.new_label_desc_placeholder"}}">
+							<input class="new-label-desc-input" name="description" placeholder="{{.i18n.Tr "repo.issues.new_label_desc_placeholder"}}" maxlength="200">
 						</div>
 					</div>
 					<div class="color picker column">
-						<input class="color-picker" name="color" value="#70c24a" required>
+						<input class="color-picker" name="color" value="#70c24a" required maxlength="7">
 					</div>
 					<div class="column precolors">
 						{{template "repo/issue/label_precolors"}}
diff --git a/templates/repo/issue/milestone_new.tmpl b/templates/repo/issue/milestone_new.tmpl
index 30a7d7ebbb3d..ea704c056145 100644
--- a/templates/repo/issue/milestone_new.tmpl
+++ b/templates/repo/issue/milestone_new.tmpl
@@ -26,7 +26,7 @@
 			<div class="eleven wide column">
 				<div class="field {{if .Err_Title}}error{{end}}">
 					<label>{{.i18n.Tr "repo.milestones.title"}}</label>
-					<input name="title" placeholder="{{.i18n.Tr "repo.milestones.title"}}" value="{{.title}}" autofocus required>
+					<input name="title" placeholder="{{.i18n.Tr "repo.milestones.title"}}" value="{{.title}}" autofocus required maxlength="50">
 				</div>
 				<div class="field">
 					<label>{{.i18n.Tr "repo.milestones.desc"}}</label>
diff --git a/templates/repo/issue/new_form.tmpl b/templates/repo/issue/new_form.tmpl
index 99a68bc76eaa..6777ec7c0765 100644
--- a/templates/repo/issue/new_form.tmpl
+++ b/templates/repo/issue/new_form.tmpl
@@ -13,7 +13,7 @@
 				</a>
 				<div class="ui segment content">
 					<div class="field">
-						<input name="title" id="issue_title" placeholder="{{.i18n.Tr "repo.milestones.title"}}" value="{{.title}}" tabindex="3" autofocus required>
+						<input name="title" id="issue_title" placeholder="{{.i18n.Tr "repo.milestones.title"}}" value="{{.title}}" tabindex="3" autofocus required maxlength="255">
 						{{if .PageIsComparePull}}
 							<span class="title_wip_desc">{{.i18n.Tr "repo.pulls.title_wip_desc" (index .PullRequestWorkInProgressPrefixes 0| Escape) | Safe}}</span>
 						{{end}}
diff --git a/templates/repo/issue/view_title.tmpl b/templates/repo/issue/view_title.tmpl
index 4b254d2c4b4a..e97ca3265c99 100644
--- a/templates/repo/issue/view_title.tmpl
+++ b/templates/repo/issue/view_title.tmpl
@@ -3,7 +3,7 @@
 		<h1 class="twelve wide column">
 			<span class="index">#{{.Issue.Index}}</span> <span id="issue-title" class="has-emoji">{{.Issue.Title}}</span>
 			<div id="edit-title-input" class="ui input" style="display: none">
-				<input value="{{.Issue.Title}}">
+				<input value="{{.Issue.Title}}" maxlength="255">
 			</div>
 		</h1>
 		{{if and (or .IsIssueWriter .IsIssuePoster) (not .Repository.IsArchived)}}
diff --git a/templates/repo/release/new.tmpl b/templates/repo/release/new.tmpl
index cdead92b9d29..01af6edc1253 100644
--- a/templates/repo/release/new.tmpl
+++ b/templates/repo/release/new.tmpl
@@ -19,7 +19,7 @@
 					{{if .PageIsEditRelease}}
 						<b>{{.tag_name}}</b><span class="at">@</span><strong>{{.tag_target}}</strong>
 					{{else}}
-						<input id="tag-name" name="tag_name" value="{{.tag_name}}" placeholder="{{.i18n.Tr "repo.release.tag_name"}}" autofocus required>
+						<input id="tag-name" name="tag_name" value="{{.tag_name}}" placeholder="{{.i18n.Tr "repo.release.tag_name"}}" autofocus required maxlength="255">
 						<span class="at">@</span>
 						<div class="ui selection dropdown">
 							<input type="hidden" name="tag_target" value="{{.tag_target}}"/>
@@ -42,7 +42,7 @@
 			<div class="eleven wide column">
 				<div class="field {{if .Err_Title}}error{{end}}">
 					<label>{{.i18n.Tr "repo.release.title"}}</label>
-					<input name="title" placeholder="{{.i18n.Tr "repo.release.title"}}" value="{{.title}}" autofocus required>
+					<input name="title" placeholder="{{.i18n.Tr "repo.release.title"}}" value="{{.title}}" autofocus required maxlength="255">
 				</div>
 				<div class="field">
 					<label>{{.i18n.Tr "repo.release.content"}}</label>