CVE-2026-29146

Padding Oracle vulnerability in Apache Tomcat's EncryptInterceptor with default configuration.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.0.0-M1 through 10.1.52, from 9.0.13 through 9..115, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109.

Users are recommended to upgrade to version 11.0.19, 10.1.53 and 9.0.116, which fixes the issue.

Tomcat is the servlet container that is used in the official Reference Implementation for the Java Servlet and JavaServer Pages technologies. The Java Servlet and JavaServer Pages specifications are developed by Sun under the Java Community Process.

Security Fix(es):

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat via invalid chunk extension.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.1.0-M1 through 10.1.52, from 9.0.0.M1 through 9.0.115, from 8.5.0 through 8.5.100, from 7.0.0 through 7.0.109. Other, unsupported versions may also be affected.

Users are recommended to upgrade to version 11.0.20, 10.1.52 or 9.0.116, which fix the issue.(CVE-2026-24880)

Occasional URL redirection to untrusted Site ('Open Redirect') vulnerability in Apache Tomcat via the LoadBalancerDrainingValve.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.1.0-M1 through 10.1.52, from 9.0.0.M23 through 9.0.115, from 8.5.30 through 8.5.100. Other, unsupported versions may also be affected

Users are recommended to upgrade to version 11.0.20, 10.1.53 or 9.0.116, which fix the issue.(CVE-2026-25854)

Configured cipher preference order not preserved vulnerability in Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.16 through 11.0.18, from 10.1.51 through 10.1.52, from 9.0.114 through 9.0.115.

Users are recommended to upgrade to version 11.0.20, 10.1.53 or 9.0.116, which fix the issue.(CVE-2026-29129)

CLIENT_CERT authentication does not fail as expected for some scenarios when soft fail is disabled vulnerability in Apache Tomcat, Apache Tomcat Native.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.1.0-M7 through 10.1.52, from 9.0.83 through 9.0.115; Apache Tomcat Native: from 1.1.23 through 1.1.34, from 1.2.0 through 1.2.39, from 1.3.0 through 1.3.6, from 2.0.0 through 2.0.13.

Users are recommended to upgrade to version Tomcat Native 1.3.7 or 2.0.14 and Tomcat 11.0.20, 10.1.53 and 9.0.116, which fix the issue.(CVE-2026-29145)

Padding Oracle vulnerability in Apache Tomcat's EncryptInterceptor with default configuration.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.0.0-M1 through 10.1.52, from 9.0.13 through 9..115, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109.

Users are recommended to upgrade to version 11.0.19, 10.1.53 and 9.0.116, which fixes the issue.(CVE-2026-29146)

Improper Input Validation vulnerability in Apache Tomcat due to an incomplete fix of CVE-2025-66614.

This issue affects Apache Tomcat: from 11.0.15 through 11.0.19, from 10.1.50 through 10.1.52, from 9.0.113 through 9.0.115.

Users are recommended to upgrade to version 11.0.20, 10.1.53 or 9.0.116, which fix the issue.(CVE-2026-32990)

Improper Encoding or Escaping of Output vulnerability in the JsonAccessLogValve component of Apache Tomcat.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1.53, from 9.0.40 through 9.0.116.

Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117 , which fix the issue.(CVE-2026-34483)

Missing Encryption of Sensitive Data vulnerability in Apache Tomcat due to the fix for CVE-2026-29146 allowing the bypass of the EncryptInterceptor.

This issue affects Apache Tomcat: 11.0.20, 10.1.53, 9.0.116.

Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fix the issue.(CVE-2026-34486)

Insertion of Sensitive Information into Log File vulnerability in the cloud membership for clustering component of Apache Tomcat exposed the Kubernetes bearer token.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.20, from 10.1.0-M1 through 10.1.53, from 9.0.13 through 9.0.116.

Users are recommended to upgrade to version 11.0.21, 10.1.54 or 9.0.117, which fix the issue.(CVE-2026-34487)

CLIENT_CERT authentication does not fail as expected for some…

Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies.

Security Fix(es):

• Apache Tomcat: Apache Tomcat: Information disclosure via Padding Oracle vulnerability in EncryptInterceptor (CVE-2026-29146)

• Apache Tomcat: Apache Tomcat: Missing Encryption of Sensitive Data due to EncryptInterceptor bypass (CVE-2026-34486)

Bug Fix(es) and Enhancement(s):

• Remove tomcat clustering JAR from RPM builds (JIRA:Rocky Linux-168577)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tomcat is the servlet container that is used in the official Reference Implementation for the Java Servlet and JavaServer Pages technologies. The Java Servlet and JavaServer Pages specifications are developed by Sun under the Java Community Process. Tomcat is developed in an open and participatory environment and released under the Apache Software License version 2.0. Tomcat is intended to be a collaboration of the best-of-breed developers from around the world.

Security Fix(es):

• Apache Tomcat: Apache Tomcat: Information disclosure via Padding Oracle vulnerability in EncryptInterceptor (CVE-2026-29146)

• Apache Tomcat: Apache Tomcat: Missing Encryption of Sensitive Data due to EncryptInterceptor bypass (CVE-2026-34486)

Bug Fix(es) and Enhancement(s):

• Remove tomcat clustering JAR from RPM builds (JIRA:Rocky Linux-185571)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies.

Security Fix(es):

• Apache Tomcat: Apache Tomcat: Information disclosure via Padding Oracle vulnerability in EncryptInterceptor (CVE-2026-29146)

• Apache Tomcat: Apache Tomcat: Missing Encryption of Sensitive Data due to EncryptInterceptor bypass (CVE-2026-34486)

Bug Fix(es) and Enhancement(s):

• Remove tomcat clustering JAR from RPM builds (JIRA:Rocky Linux-183992)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies.

Security Fix(es):

• Apache Tomcat: Apache Tomcat: Information disclosure via Padding Oracle vulnerability in EncryptInterceptor (CVE-2026-29146)

• Apache Tomcat: Apache Tomcat: Missing Encryption of Sensitive Data due to EncryptInterceptor bypass (CVE-2026-34486)

Bug Fix(es) and Enhancement(s):

• Remove tomcat clustering JAR from RPM builds (JIRA:Rocky Linux-183993)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Padding Oracle vulnerability in Apache Tomcat's EncryptInterceptor with default configuration. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.18, from 10.0.0-M1 through 10.1.52, from 9.0.13 through 9..115, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109. Users are recommended to upgrade to version 11.0.19, 10.1.53 and 9.0.116, which fixes the issue.

Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies.

Security Fix(es):

• Apache Tomcat: Apache Tomcat: Information disclosure via Padding Oracle vulnerability in EncryptInterceptor (CVE-2026-29146)
• Apache Tomcat: Apache Tomcat: Missing Encryption of Sensitive Data due to EncryptInterceptor bypass (CVE-2026-34486)

Bug Fix(es) and Enhancement(s):

• Remove tomcat clustering JAR from RPM builds (JIRA:AlmaLinux-168577)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Tomcat is the servlet container that is used in the official Reference Implementation for the Java Servlet and JavaServer Pages technologies. The Java Servlet and JavaServer Pages specifications are developed by Sun under the Java Community Process. Tomcat is developed in an open and participatory environment and released under the Apache Software License version 2.0. Tomcat is intended to be a collaboration of the best-of-breed developers from around the world.

Security Fix(es):

• Apache Tomcat: Apache Tomcat: Information disclosure via Padding Oracle vulnerability in EncryptInterceptor (CVE-2026-29146)
• Apache Tomcat: Apache Tomcat: Missing Encryption of Sensitive Data due to EncryptInterceptor bypass (CVE-2026-34486)

Bug Fix(es) and Enhancement(s):

• Remove tomcat clustering JAR from RPM builds (JIRA:AlmaLinux-185571)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies.

Security Fix(es):

• Apache Tomcat: Apache Tomcat: Information disclosure via Padding Oracle vulnerability in EncryptInterceptor (CVE-2026-29146)
• Apache Tomcat: Apache Tomcat: Missing Encryption of Sensitive Data due to EncryptInterceptor bypass (CVE-2026-34486)

Bug Fix(es) and Enhancement(s):

• Remove tomcat clustering JAR from RPM builds (JIRA:AlmaLinux-183992)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Apache Tomcat is a servlet container for the Java Servlet and JavaServer Pages (JSP) technologies.

Security Fix(es):

• Apache Tomcat: Apache Tomcat: Information disclosure via Padding Oracle vulnerability in EncryptInterceptor (CVE-2026-29146)
• Apache Tomcat: Apache Tomcat: Missing Encryption of Sensitive Data due to EncryptInterceptor bypass (CVE-2026-34486)

Bug Fix(es) and Enhancement(s):

• Remove tomcat clustering JAR from RPM builds (JIRA:AlmaLinux-183993)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Padding Oracle vulnerability in Apache Tomcat's EncryptInterceptor with default configuration.

This issue affects Apache Tomcat: from 11.0.0 through 11.0.18, from 10.0.0 through 10.1.52, from 9.0.13 through 9..115, from 8.5.38 through 8.5.100, from 7.0.100 through 7.0.109.

Users are recommended to upgrade to version 11.0.19, 10.1.53 and 9.0.116, which fixes the issue.

TuxCare rebuilt 4 packages to address 3 CVEs. Fixed in 9.0.90-tuxcare.5.

TuxCare rebuilt 4 packages to address 3 CVEs. Fixed in 9.0.100-tuxcare.4.

TuxCare rebuilt 4 packages to address 3 CVEs. Fixed in 9.0.46-tuxcare.4.

TuxCare rebuilt 4 packages to address 3 CVEs. Fixed in 9.0.75-tuxcare.5.

TuxCare rebuilt 4 packages to address 4 CVEs. Fixed in 9.0.87-tuxcare.6.

TuxCare rebuilt 2 org.apache.tomcat packages to address 1 CVE. Fixed in 10.1.18-tuxcare.4.

TuxCare rebuilt 4 packages to address 3 CVEs. Fixed in 8.5.100-tuxcare.9.

• CVE-2025-55668: fix session fixation in RewriteValve by encoding session id into sendRedirect URL and recycling session info on rewrite reinvoke
• CVE-2026-29146: fix padding oracle in EncryptInterceptor by changing default cipher to AES/GCM/NoPadding and rejecting insecure mode+padding combinations

• CVE-2026-29146: change the default EncryptInterceptor cipher to AES/GCM/NoPadding and reject insecure cipher mode/padding combinations to mitigate the CBC padding oracle attack (upstream tomcat 9.0.116)
• CVE-2026-34486: restore super.messageReceived() inside the try block so a failed decryption is not forwarded, closing the EncryptInterceptor fail-open bypass introduced by the CVE-2026-29146 fix (upstream tomcat 9.0.117)

TuxCare rebuilt 2 org.apache.tomcat packages to address 3 CVEs. Fixed in 7.0.109-tuxcare.4.

TuxCare rebuilt 2 org.apache.tomcat packages to address 2 CVEs. Fixed in 9.0.50-tuxcare.13.

• SECURITY UPDATE: HTTP/2 header limit errors deferred until whole header block read
  • debian/patches/CVE-2024-24549.patch: validate headers after each HEADERS/CONTINUATION payload instead of only at end of block in java/org/apache/coyote/http2/Http2Parser.java, and swap the header emitter to the sink once validation fails in java/org/apache/coyote/http2/{Stream,Http2UpgradeHandler}.java
  • CVE-2024-24549
• SECURITY UPDATE: HTTP/2 active stream miscount leading to infinite connection timeout
  • debian/patches/CVE-2024-34750.patch: count each stream out of the active set exactly once in java/org/apache/coyote/http2/{Http2UpgradeHandler,Http2AsyncUpgradeHandler,Stream}.java
  • CVE-2024-34750
• SECURITY UPDATE: RCE via TOCTOU race in write-enabled default servlet on case insensitive file systems
  • debian/patches/CVE-2024-50379.patch: add path-keyed read/write locking via the new java/org/apache/catalina/WebResourceLockSet.java and use it in java/org/apache/catalina/webresources/{DirResourceSet,FileResource}.java
  • CVE-2024-50379
• SECURITY UPDATE: incomplete mitigation for CVE-2024-50379 on Java 8 and Java 11
  • debian/patches/CVE-2024-56337.patch: set -Dsun.io.useCanonCaches=false before any file system access in bin/catalina.sh
  • CVE-2024-56337
• SECURITY UPDATE: authentication bypass when a Jakarta Authentication component throws
  • debian/patches/CVE-2024-52316.patch: set a 500 status when validateRequest() throws AuthException in java/org/apache/catalina/authenticator/AuthenticatorBase.java
  • CVE-2024-52316
• SECURITY UPDATE: HTTP/2 denial of service via client triggered server side stream resets
  • debian/patches/CVE-2025-48989.patch: charge server initiated resets to the overhead counter in java/org/apache/coyote/http2/{Http2UpgradeHandler,Http2AsyncUpgradeHandler}.java
  • CVE-2025-48989
• SECURITY UPDATE: directory traversal via Rewrite Valve normalizing before decoding
  • debian/patches/CVE-2025-55752.patch: decode the rewritten URL before normalizing it in java/org/apache/catalina/valves/rewrite/RewriteValve.java
  • CVE-2025-55752
• SECURITY UPDATE: EncryptInterceptor padding oracle from the CBC default
  • debian/patches/CVE-2026-29146.patch: reject cipher modes that provide no protection and warn on the weaker ones in java/org/apache/catalina/tribes/group/interceptors/EncryptInterceptor.java; AES/GCM/PKCS5Padding, AES/CBC/NoPadding, AES/CFB/NoPadding and AES/OFB/NoPadding are now refused at startup
  • CVE-2026-29146

TuxCare rebuilt 2 org.apache.tomcat packages to address 2 CVEs. Fixed in 9.0.83-tuxcare.5.

TuxCare rebuilt 2 org.apache.tomcat packages to address 2 CVEs. Fixed in 10.1.42-tuxcare.7.

• SECURITY UPDATE: padding oracle attack in the Tribes EncryptInterceptor
  • debian/patches/CVE-2026-29146.patch: restrict the cipher algorithm modes accepted by setEncryptionAlgorithm and change the implicit mode to GCM/NoPadding in java/org/apache/catalina/tribes/group/interceptors/EncryptInterceptor.java
  • CVE-2026-29146

• SECURITY UPDATE: fix for the following CVEs:
  • CVE-2025-48989: MadeYouReset HTTP/2 DoS — charge the connection overhead budget for server-initiated RST_STREAM frames in both Http2UpgradeHandler and Http2AsyncUpgradeHandler, and apply the initial HTTP/2 MAX_CONCURRENT_STREAMS and INITIAL_WINDOW_SIZE limits immediately (force-set) rather than only after the client ACKs the SETTINGS frame, closing the "malformed control frame -> server RST" amplification loop.
  • CVE-2025-55752: RewriteValve query-string-append (QSA) path traversal — swap the normalize/decode order in RewriteValve.invoke() so the rewritten URL is URL-decoded before normalisation, preventing encoded traversal sequences such as %2F..%2F from surviving normalize() and later reaching /WEB-INF/ or /META-INF/.
  • CVE-2026-29146: EncryptInterceptor padding oracle — validate the configured cluster encryptionAlgorithm against an allow-list. GCM is now only accepted with NoPadding; NONE, ECB, PCBC, CTS, KW, KWP and CTR are refused outright, as are CBC, CFB and OFB with NoPadding and CFB/OFB at a non-default block size (CFB8, OFB64, ...); an unusable algorithm raises IllegalArgumentException at startup instead of failing later. CBC, CFB and OFB with PKCS5Padding continue to work but log a warning recommending AES/GCM/NoPadding. The default encryptionAlgorithm also changes from AES/CBC/PKCS5Padding to the authenticated AES/GCM/NoPadding, which is what actually removes the padding oracle for the deployments that never set the attribute explicitly. Rollout note: AES/GCM/NoPadding is not wire-compatible with AES/CBC/PKCS5Padding, so nodes on the old and new defaults cannot exchange cluster messages. The preferred procedure is to stop the whole cluster and restart it on the new package. If a rolling restart is unavoidable, first set encryptionAlgorithm="AES/CBC/PKCS5Padding" explicitly on every node, roll the package out, then remove that setting everywhere and restart once more. This pin is a rollout-window measure only and must not be left in place: for as long as it is set the cluster remains exposed to the padding oracle, and the fix is complete only once it has been removed.

• SECURITY UPDATE: Denial of service in HTTP/2 - a stream could be removed from the count of active streams more than once, driving the count below the real value, so an infinite connection timeout was applied and connections that should have been closed stayed open
  • debian/patches/CVE-2024-34750.patch: guard each stream with an AtomicBoolean so that it is removed from the active stream count at most once, and route the decrements through the new decrementActiveRemoteStreamCount(Stream) helper
  • CVE-2024-34750
• SECURITY UPDATE: Remote code execution via the write enabled default servlet - on a case insensitive file system a race between a read and a concurrent write for the same path allowed an uploaded file to be picked up and compiled as a JSP
  • debian/patches/CVE-2024-50379.patch: add the WebResourceLockSet interface and serialise reads and writes for the same resource path in DirResourceSet and FileResource through a per-path read/write lock
  • CVE-2024-50379
• SECURITY UPDATE: Authentication bypass when a custom Jakarta Authentication component throws an exception without setting an HTTP status, leaving the response status at 200
  • debian/patches/CVE-2024-52316.patch: explicitly set a 500 status in authenticateJaspic() when validateRequest() throws an AuthException
  • CVE-2024-52316
• SECURITY UPDATE: Remote code execution via the write enabled default servlet - the mitigation for CVE-2024-50379 was incomplete because the JVM global canonical file name cache could still return a stale result for the concurrently written path
  • debian/patches/CVE-2024-56337.patch: disable the canonical file name cache before a potentially exposed WebResourceSet starts and refuse to start it if that cannot be confirmed, add Jre12Compat and Jre21Compat for the per Java version cache behaviour, and pass -Dsun.io.useCanonCaches=false from catalina.sh
  • CVE-2024-56337
• SECURITY UPDATE: Denial of service in HTTP/2 (MadeYouReset) - frames that make the server reset a stream were not counted against the connection overhead budget, so the CVE-2023-44487 mitigation never triggered
  • debian/patches/CVE-2025-48989.patch: count every RST_STREAM frame Tomcat sends using overheadResetFactor
  • CVE-2025-48989
• SECURITY UPDATE: Directory traversal via the RewriteValve, with possible remote code execution if PUT is enabled - the rewritten URL was normalized while still percent encoded, so an encoded ../ survived normalization and was decoded afterwards, letting the request escape into /WEB-INF/ or /META-INF/
  • debian/patches/CVE-2025-55752.patch: decode the rewritten URL before normalizing it, and reject the request with a 400 when normalization reports that the path escapes root
  • CVE-2025-55752
• SECURITY UPDATE: Padding oracle in the cluster EncryptInterceptor - the interceptor accepted cipher mode and padding combinations that offer no protection, and the CBC modes it accepted are malleable and open to a padding oracle
  • debian/patches/CVE-2026-29146.patch: reject the cipher mode and padding combinations that offer no protection, warn for the CBC, CFB and OFB modes with PKCS5Padding that are kept for compatibility, and recognise GCM/NoPadding as the recommended transformation. The patch also carries the upstream partial revert 776e12b3, without which the fix would reintroduce CVE-2026-34486 by passing messages that failed to decrypt up the interceptor chain with their raw bytes. Note that, as upstream, explicit EncryptInterceptor configurations using a mode that offers no protection (NONE, ECB, PCBC, CTS, KW, KWP, CTR, and CBC, CFB or OFB with NoPadding) are now rejected at startup. The default …

TuxCare rebuilt 8 packages to address 32 CVEs. Fixed in 9.0.24-tuxcare.1.

TuxCare rebuilt 7 packages to address 24 CVEs. Fixed in 8.5.46-tuxcare.1.

TuxCare rebuilt 7 packages to address 13 CVEs. Fixed in 8.5.78-tuxcare.1.

TuxCare rebuilt 5 packages to address 9 CVEs. Fixed in 9.0.13-tuxcare.1.

TuxCare rebuilt 5 packages to address 6 CVEs. Fixed in 9.0.39-tuxcare.1.

TuxCare rebuilt 5 packages to address 15 CVEs. Fixed in 10.1.16-tuxcare.1.