This is an automated email from the ASF dual-hosted git repository.
rmaucher pushed a commit to branch 9.0.x
in repository https://gitbox.apache.org/repos/asf/tomcat.git
The following commit(s) were added to refs/heads/9.0.x by this push:
new 50ed843bea Improve trailer allowed list check
50ed843bea is described below
commit 50ed843bea6f71728ca20c6fa804a2d0931cb28d
Author: remm <[email protected]>
AuthorDate: Tue May 19 14:26:41 2026 +0200
Improve trailer allowed list check
Otherwise, cookie, host and priority could be set through the trailers.
---
java/org/apache/coyote/http2/Stream.java | 8 +++++---
webapps/docs/changelog.xml | 3 +++
2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/java/org/apache/coyote/http2/Stream.java
b/java/org/apache/coyote/http2/Stream.java
index bde3b6c2b1..8dcae75fdb 100644
--- a/java/org/apache/coyote/http2/Stream.java
+++ b/java/org/apache/coyote/http2/Stream.java
@@ -376,6 +376,11 @@ class Stream extends AbstractNonZeroStream implements
HeaderEmitter {
headerState = HEADER_STATE_REGULAR;
}
+ if (headerState == HEADER_STATE_TRAILER &&
!handler.getProtocol().isTrailerHeaderAllowed(name)) {
+ // Processing trailers and the header is not in the allowed list
+ return;
+ }
+
switch (name) {
case ":method": {
if (coyoteRequest.getMethod() == null) {
@@ -491,9 +496,6 @@ class Stream extends AbstractNonZeroStream implements
HeaderEmitter {
break;
}
default: {
- if (headerState == HEADER_STATE_TRAILER &&
!handler.getProtocol().isTrailerHeaderAllowed(name)) {
- break;
- }
if ("expect".equals(name) && "100-continue".equals(value)) {
coyoteRequest.setExpectation(true);
}
diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
index 277abe3eda..c1ea3d98cc 100644
--- a/webapps/docs/changelog.xml
+++ b/webapps/docs/changelog.xml
@@ -145,6 +145,9 @@
Ensure that malformed HTTP/2 messages that should trigger a stream
reset
do so, rather than triggered a connection close. (markt)
</fix>
+ <fix>
+ Improve enforcement of header trailer allow list for HTTP/2. (remm)
+ </fix>
</changelog>
</subsection>
<subsection name="Cluster">
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