From 8e44990ed463b0bf5a175049526d8f4d3f08b208 Mon Sep 17 00:00:00 2001
From: Kittywhiskers Van Gogh <63189531+kwvg@users.noreply.github.com>
Date: Sat, 20 Dec 2025 23:35:54 +0530
Subject: [PATCH] chore!: enforce ban for re-propagation of stale `QFCOMMIT`s

---
 src/llmq/blockprocessor.cpp | 5 +++--
 src/version.h               | 7 ++++---
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/llmq/blockprocessor.cpp b/src/llmq/blockprocessor.cpp
index 5f9290850cac..791cd430115a 100644
--- a/src/llmq/blockprocessor.cpp
+++ b/src/llmq/blockprocessor.cpp
@@ -131,8 +131,9 @@ MessageProcessingResult CQuorumBlockProcessor::ProcessMessage(const CNode& peer,
         if (pQuorumBaseBlockIndex->nHeight < (m_chainstate.m_chain.Height() - llmq_params_opt->dkgInterval)) {
             LogPrint(BCLog::LLMQ, "CQuorumBlockProcessor::%s -- block %s is too old, peer=%d\n", __func__,
                      qc.quorumHash.ToString(), peer.GetId());
-            // TODO: enable punishment in some future version when all/most nodes are running with this fix
-            // ret.m_error = MisbehavingError{100};
+            if (peer.GetCommonVersion() >= QFCOMMIT_STALE_REPROP_BAN_VERSION) {
+                ret.m_error = MisbehavingError{100};
+            }
             return ret;
         }
         if (HasMinedCommitment(type, qc.quorumHash)) {
diff --git a/src/version.h b/src/version.h
index 6b5edffb7755..651bfc339153 100644
--- a/src/version.h
+++ b/src/version.h
@@ -10,8 +10,7 @@
  * network protocol versioning
  */
 
-
-static const int PROTOCOL_VERSION = 70238;
+static const int PROTOCOL_VERSION = 70239;
 
 //! initial proto version, to be increased after version/verack negotiation
 static const int INIT_PROTO_VERSION = 209;
@@ -52,13 +51,15 @@ static const int INCREASE_MAX_HEADERS2_VERSION = 70235;
 //! Behavior of QRINFO is changed in this protocol version
 static const int EFFICIENT_QRINFO_VERSION = 70236;
 
-
 //! cycleHash in isdlock message switched to using quorum's base block in this version
 static const int ISDLOCK_CYCLEHASH_UPDATE_VERSION = 70237;
 
 //! Introduced new p2p message platform pose BAN
 static const int PLATFORM_BAN_VERSION = 70238;
 
+//! Ban of re-propagation of old QFCOMMIT enforcement
+static const int QFCOMMIT_STALE_REPROP_BAN_VERSION = 70239;
+
 // Make sure that none of the values above collide with `ADDRV2_FORMAT`.
 
 #endif // BITCOIN_VERSION_H