From 884c811a628ed1714282f506328a7cbd9e0fd9a1 Mon Sep 17 00:00:00 2001
From: Prince Jain <princejain756@gmail.com>
Date: Thu, 22 Oct 2026 22:05:04 +0530
Subject: [PATCH] fix(pg-protocol): expose severity field V as
 severityNonLocalized
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The V field holds the never-localized severity, while S is translated
per lc_messages. The parser already read V into the field map but kept
only S, so on a localized server nothing on the error object carried a
severity a client could compare (a Russian FATAL arrives as "ВАЖНО").
Errors and notices now expose it beside severity.

Fixes #3827
---
 packages/pg-protocol/src/inbound-parser.test.ts | 5 +++++
 packages/pg-protocol/src/messages.ts            | 3 +++
 packages/pg-protocol/src/parser.ts              | 1 +
 3 files changed, 9 insertions(+)

diff --git a/packages/pg-protocol/src/inbound-parser.test.ts b/packages/pg-protocol/src/inbound-parser.test.ts
index 8687194c3..2f1e81508 100644
--- a/packages/pg-protocol/src/inbound-parser.test.ts
+++ b/packages/pg-protocol/src/inbound-parser.test.ts
@@ -336,6 +336,10 @@ describe('PgPacketStream', function () {
         type: 'S',
         value: 'ERROR',
       },
+      {
+        type: 'V',
+        value: 'UNLOCALIZED_ERROR',
+      },
       {
         type: 'C',
         value: 'code',
@@ -389,6 +393,7 @@ describe('PgPacketStream', function () {
     testForMessage(buffer, {
       name: 'error',
       severity: 'ERROR',
+      severityNonLocalized: 'UNLOCALIZED_ERROR',
       code: 'code',
       message: 'message',
       detail: 'details',
diff --git a/packages/pg-protocol/src/messages.ts b/packages/pg-protocol/src/messages.ts
index c3fbbdd9b..61c350984 100644
--- a/packages/pg-protocol/src/messages.ts
+++ b/packages/pg-protocol/src/messages.ts
@@ -77,6 +77,7 @@ export const copyDone: BackendMessage = {
 interface NoticeOrError {
   message: string | undefined
   severity: string | undefined
+  severityNonLocalized: string | undefined
   code: string | undefined
   detail: string | undefined
   hint: string | undefined
@@ -96,6 +97,7 @@ interface NoticeOrError {
 
 export class DatabaseError extends Error implements NoticeOrError {
   public severity: string | undefined
+  public severityNonLocalized: string | undefined
   public code: string | undefined
   public detail: string | undefined
   public hint: string | undefined
@@ -244,6 +246,7 @@ export class NoticeMessage implements BackendMessage, NoticeOrError {
   ) {}
   public readonly name = 'notice'
   public severity: string | undefined
+  public severityNonLocalized: string | undefined
   public code: string | undefined
   public detail: string | undefined
   public hint: string | undefined
diff --git a/packages/pg-protocol/src/parser.ts b/packages/pg-protocol/src/parser.ts
index df48ca4a1..5712d1f8f 100644
--- a/packages/pg-protocol/src/parser.ts
+++ b/packages/pg-protocol/src/parser.ts
@@ -395,6 +395,7 @@ const parseErrorMessage = (reader: BufferReader, name: MessageName) => {
       : new DatabaseError(messageValue, LATEINIT_LENGTH, name)
 
   message.severity = fields.S
+  message.severityNonLocalized = fields.V
   message.code = fields.C
   message.detail = fields.D
   message.hint = fields.H