diff --git a/CHANGELOG.md b/CHANGELOG.md
index fdf539a40..65d775c37 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -54,6 +54,7 @@ All notable changes to this project will be documented in this file.
 - superset: Fix the 4.1.2 build when building from source ([#1309])
 - superset: Pin `luxon` to version 3.6.1 to fix build ([#1315], [#1316])
 - nifi: Use a patched version of logback to fix corrupted logs ([#1314])
+- zookeeper: Use a patched version of logback to fix corrupted logs ([#1320])
 
 ### Fixed
 
@@ -117,6 +118,7 @@ All notable changes to this project will be documented in this file.
 [#1316]: https://github.com/stackabletech/docker-images/pull/1316
 [#1318]: https://github.com/stackabletech/docker-images/pull/1318
 [#1319]: https://github.com/stackabletech/docker-images/pull/1319
+[#1320]: https://github.com/stackabletech/docker-images/pull/1320
 
 ## [25.7.0] - 2025-07-23
 
diff --git a/shared/logback/boil-config.toml b/shared/logback/boil-config.toml
index 206d0206e..ab980a5ec 100644
--- a/shared/logback/boil-config.toml
+++ b/shared/logback/boil-config.toml
@@ -1,5 +1,11 @@
+[versions."1.2.13".local-images]
+java-devel = "8"
+
 [versions."1.3.14".local-images]
 java-devel = "21"
 
+[versions."1.3.15".local-images]
+java-devel = "21"
+
 [versions."1.5.18".local-images]
 java-devel = "21"
diff --git a/shared/logback/stackable/patches/1.2.13/0001-fix-move-StringBuilder-into-function-to-prevent-race.patch b/shared/logback/stackable/patches/1.2.13/0001-fix-move-StringBuilder-into-function-to-prevent-race.patch
new file mode 100644
index 000000000..8233d3cfa
--- /dev/null
+++ b/shared/logback/stackable/patches/1.2.13/0001-fix-move-StringBuilder-into-function-to-prevent-race.patch
@@ -0,0 +1,38 @@
+From 2f94a71b44275028e99fcf4f7540ae694a1d68c7 Mon Sep 17 00:00:00 2001
+From: Andrew Kenworthy <andrew.kenworthy@stackable.tech>
+Date: Mon, 27 Oct 2025 15:58:12 +0100
+Subject: fix: move StringBuilder into function to prevent race
+
+---
+ .../java/ch/qos/logback/classic/log4j/XMLLayout.java   | 10 +---------
+ 1 file changed, 1 insertion(+), 9 deletions(-)
+
+diff --git a/logback-classic/src/main/java/ch/qos/logback/classic/log4j/XMLLayout.java b/logback-classic/src/main/java/ch/qos/logback/classic/log4j/XMLLayout.java
+index ee640eeb6..edda3e9fb 100644
+--- a/logback-classic/src/main/java/ch/qos/logback/classic/log4j/XMLLayout.java
++++ b/logback-classic/src/main/java/ch/qos/logback/classic/log4j/XMLLayout.java
+@@ -38,9 +38,7 @@ import ch.qos.logback.core.helpers.Transform;
+ public class XMLLayout extends LayoutBase<ILoggingEvent> {
+ 
+     private final int DEFAULT_SIZE = 256;
+-    private final int UPPER_LIMIT = 2048;
+ 
+-    private StringBuilder buf = new StringBuilder(DEFAULT_SIZE);
+     private boolean locationInfo = false;
+     private boolean properties = false;
+ 
+@@ -96,13 +94,7 @@ public class XMLLayout extends LayoutBase<ILoggingEvent> {
+      */
+     public String doLayout(ILoggingEvent event) {
+ 
+-        // Reset working buffer. If the buffer is too large, then we need a new
+-        // one in order to avoid the penalty of creating a large array.
+-        if (buf.capacity() > UPPER_LIMIT) {
+-            buf = new StringBuilder(DEFAULT_SIZE);
+-        } else {
+-            buf.setLength(0);
+-        }
++        StringBuilder buf = new StringBuilder(DEFAULT_SIZE);
+ 
+         // We yield to the \r\n heresy.
+ 
diff --git a/shared/logback/stackable/patches/1.2.13/patchable.toml b/shared/logback/stackable/patches/1.2.13/patchable.toml
new file mode 100644
index 000000000..83e1aa572
--- /dev/null
+++ b/shared/logback/stackable/patches/1.2.13/patchable.toml
@@ -0,0 +1,2 @@
+mirror = "https://github.com/stackabletech/logback.git"
+base = "2648b9e7fbb47426c89b9c93b411c07484e8f277"
diff --git a/shared/logback/stackable/patches/1.3.15/0001-fix-move-StringBuilder-into-function-to-prevent-race.patch b/shared/logback/stackable/patches/1.3.15/0001-fix-move-StringBuilder-into-function-to-prevent-race.patch
new file mode 100644
index 000000000..b25533564
--- /dev/null
+++ b/shared/logback/stackable/patches/1.3.15/0001-fix-move-StringBuilder-into-function-to-prevent-race.patch
@@ -0,0 +1,38 @@
+From afa8af8c6574806e2482063a301130562a8f2b0d Mon Sep 17 00:00:00 2001
+From: Andrew Kenworthy <andrew.kenworthy@stackable.tech>
+Date: Mon, 27 Oct 2025 16:00:59 +0100
+Subject: fix: move StringBuilder into function to prevent race
+
+---
+ .../java/ch/qos/logback/classic/log4j/XMLLayout.java   | 10 +---------
+ 1 file changed, 1 insertion(+), 9 deletions(-)
+
+diff --git a/logback-classic/src/main/java/ch/qos/logback/classic/log4j/XMLLayout.java b/logback-classic/src/main/java/ch/qos/logback/classic/log4j/XMLLayout.java
+index 4bc04388a..405f4ef26 100644
+--- a/logback-classic/src/main/java/ch/qos/logback/classic/log4j/XMLLayout.java
++++ b/logback-classic/src/main/java/ch/qos/logback/classic/log4j/XMLLayout.java
+@@ -38,9 +38,7 @@ import ch.qos.logback.core.helpers.Transform;
+ public class XMLLayout extends LayoutBase<ILoggingEvent> {
+ 
+     private final int DEFAULT_SIZE = 256;
+-    private final int UPPER_LIMIT = 2048;
+ 
+-    private StringBuilder buf = new StringBuilder(DEFAULT_SIZE);
+     private boolean locationInfo = false;
+     private boolean properties = false;
+ 
+@@ -96,13 +94,7 @@ public class XMLLayout extends LayoutBase<ILoggingEvent> {
+      */
+     public String doLayout(ILoggingEvent event) {
+ 
+-        // Reset working buffer. If the buffer is too large, then we need a new
+-        // one in order to avoid the penalty of creating a large array.
+-        if (buf.capacity() > UPPER_LIMIT) {
+-            buf = new StringBuilder(DEFAULT_SIZE);
+-        } else {
+-            buf.setLength(0);
+-        }
++        StringBuilder buf = new StringBuilder(DEFAULT_SIZE);
+ 
+         // We yield to the \r\n heresy.
+ 
diff --git a/shared/logback/stackable/patches/1.3.15/patchable.toml b/shared/logback/stackable/patches/1.3.15/patchable.toml
new file mode 100644
index 000000000..293726399
--- /dev/null
+++ b/shared/logback/stackable/patches/1.3.15/patchable.toml
@@ -0,0 +1,2 @@
+mirror = "https://github.com/stackabletech/logback.git"
+base = "81f8c25e2a2fae99f45029c27dc793bdaa8cb079"
diff --git a/zookeeper/Dockerfile b/zookeeper/Dockerfile
index 1093684ef..baf4ee76f 100644
--- a/zookeeper/Dockerfile
+++ b/zookeeper/Dockerfile
@@ -4,6 +4,8 @@
 # ==============================================================================
 # START ZOOKEEPER BUILDER
 
+FROM local-image/shared/logback AS patched-logback
+
 FROM local-image/java-devel AS builder
 
 ARG PRODUCT_VERSION
@@ -16,12 +18,16 @@ COPY --chown=${STACKABLE_USER_UID}:0 zookeeper/stackable/patches/patchable.toml
 COPY --chown=${STACKABLE_USER_UID}:0 zookeeper/stackable/patches/${PRODUCT_VERSION} /stackable/src/zookeeper/stackable/patches/${PRODUCT_VERSION}
 # Copy JMX config into the builder
 COPY --chown=${STACKABLE_USER_UID}:0 zookeeper/stackable/jmx /stackable/jmx
+COPY --chown=${STACKABLE_USER_UID}:0 --from=patched-logback /stackable/.m2/repository /stackable/patched-logback-libs
 
 USER ${STACKABLE_USER_UID}
 WORKDIR /stackable
 
 # Download ZooKeeper sources from our own repo
 RUN <<EOF
+mkdir -p /stackable/.m2/repository
+cp -r /stackable/patched-logback-libs/* /stackable/.m2/repository
+
 cd "$(/stackable/patchable --images-repo-root=src checkout zookeeper ${PRODUCT_VERSION})"
 
 ORIGINAL_VERSION=$(mvn help:evaluate -Dexpression=project.version -q -DforceStdout)
@@ -84,6 +90,8 @@ LABEL  \
 COPY --chown=${STACKABLE_USER_UID}:0 --from=builder /stackable/apache-zookeeper-${PRODUCT_VERSION}-stackable${RELEASE_VERSION}-bin /stackable/apache-zookeeper-${PRODUCT_VERSION}-stackable${RELEASE_VERSION}-bin/
 COPY --chown=${STACKABLE_USER_UID}:0 --from=builder /stackable/zookeeper-${PRODUCT_VERSION}-stackable${RELEASE_VERSION}-src.tar.gz /stackable
 COPY --chown=${STACKABLE_USER_UID}:0 --from=builder /stackable/jmx /stackable/jmx/
+# Copy over the patched logback files
+COPY --chown=${STACKABLE_USER_UID}:0 --from=patched-logback /stackable/*-src.tar.gz /stackable
 COPY zookeeper/licenses /licenses
 
 RUN <<EOF
@@ -102,6 +110,7 @@ chown -h ${STACKABLE_USER_UID}:0 /stackable/zookeeper
 # fix missing permissions
 chmod g=u /stackable/jmx
 chmod g=u /stackable/apache-zookeeper-${PRODUCT_VERSION}-stackable${RELEASE_VERSION}-bin/
+chmod g=u /stackable/*-src.tar.gz
 EOF
 
 # ----------------------------------------
diff --git a/zookeeper/boil-config.toml b/zookeeper/boil-config.toml
index c4f43981b..80d3f24b4 100644
--- a/zookeeper/boil-config.toml
+++ b/zookeeper/boil-config.toml
@@ -1,6 +1,7 @@
 [versions."3.9.3".local-images]
 java-base = "17"
 java-devel = "11"
+"shared/logback" = "1.2.13"
 
 [versions."3.9.3".build-arguments]
 jmx-exporter-version = "1.4.0"
@@ -8,6 +9,7 @@ jmx-exporter-version = "1.4.0"
 [versions."3.9.4".local-images]
 java-base = "17"
 java-devel = "11"
+"shared/logback" = "1.3.15"
 
 [versions."3.9.4".build-arguments]
 jmx-exporter-version = "1.4.0"