When "Trailer" headers are sent by a client, the HTTP server internally uses the header values to populate the Request.Trailer map passed to the server handler. Because Request.Trailer is a map, each entry incurs memory overhead. For HTTP/2 servers, a malicious client can exploit this by sending a "Trailer" header that declares a large number of fields, causing the server to allocate a disproportionate amount of memory while bypassing Server.MaxHeaderValueCount and Server.MaxHeaderBytes limits. This exploit is not applicable for HTTP/1 servers, which do not support multiplexing a large number of requests over one TCP connection, and whose Server.MaxHeaderBytes are calculated differently.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade golang-srcUpgrade delveUpgrade go-toolsetUpgrade golangUpgrade golang-binUpgrade golang-docsUpgrade golang-raceUpgrade golang-testsUpgrade golang-misc | Oct 25, 2026 | Oct 20, 2026 |
| Alpine Linux | — | Upgrade dockerUpgrade go | Oct 15, 2026 | Oct 8, 2026 |
| Amazon_linux_2023 | — | Upgrade libcap-debugsourceUpgrade containerd-stressUpgrade yq-debugsourceUpgrade libcap-develUpgrade yq-debuginfoUpgrade oci-add-hooks-debuginfoUpgrade buildah-debuginfoUpgrade libcap-debuginfoUpgrade golang-miscUpgrade skopeo-debuginfoUpgrade cni-plugins-debugsourceUpgrade docker-debuginfoUpgrade git-lfsUpgrade nerdctlUpgrade libcap-staticUpgrade ecs-initUpgrade captree-debuginfoUpgrade buildahUpgrade skopeo-debugsourceUpgrade git-lfs-debugsourceUpgrade cni-pluginsUpgrade golangUpgrade runfinch-finchUpgrade credentials-fetcherUpgrade docker-debugsourceUpgrade skopeo-testsUpgrade containerd-stress-debuginfoUpgrade oci-add-hooks-debugsourceUpgrade golang-docsUpgrade libcapUpgrade buildah-debugsourceUpgrade yqUpgrade golang-binUpgrade captreeUpgrade soci-snapshotterUpgrade git-lfs-debuginfoUpgrade containerd-debugsourceUpgrade golang-testsUpgrade golang-srcUpgrade golang-sharedUpgrade dockerUpgrade containerd-debuginfoUpgrade skopeoUpgrade oci-add-hooksUpgrade cni-plugins-debuginfoUpgrade containerdUpgrade amazon-ecr-credential-helper | Oct 28, 2026 | Oct 8, 2026 |
| Redhat_linux | — | No solution existsUpgrade golangUpgrade golang-testsUpgrade golang-miscUpgrade delve-debugsourceUpgrade delve-debuginfoUpgrade golang-binUpgrade golang-srcUpgrade golang-raceUpgrade go-toolsetUpgrade golang-docsUpgrade delve | Oct 26, 2026 | Oct 8, 2026 |
| Rocky_linux | — | Upgrade delveUpgrade golang-binUpgrade go-toolsetUpgrade delve-debugsourceUpgrade golang-raceUpgrade golangUpgrade delve-debuginfo | Oct 26, 2026 | Oct 21, 2026 |
| Ubuntu | — | Upgrade golang-1.22-goUpgrade golang-1.22-srcUpgrade golang-1.22 | Oct 19, 2026 | Oct 8, 2026 |
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