CVE-2026-78661
High
Description
When coalescing adjacent text nodes in addText and fosterParent, appending to an existing TextNode's Data via string concatenation (n.Data += text) reallocated and copied the accumulated string on every token. Inputs containing many short text runs separated by ignored end tags (such as "a</x>") caused O(n^2) allocations and byte copies. Accumulate coalesced text in per-node byte slices during parsing and materialize Data strings once at the end of parse.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Golang.org/x/net
PublishedOct 27, 2026
First seenOct 27, 2026
Weakness typeCWE-407CWE-407
How to fix
Update
- golang.org/x/net0.62.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| golang.org/x/netGo | v < 0.62.0 | 0.62.0 |
| microsoft azl3_cert-manager_1.12.15-15 | No range specified | — |
| microsoft azl3_cf-cli_8.7.11-10 | No range specified | — |
| microsoft azl3_cloud-provider-kubevirt_0.5.1-10 | No range specified | — |
| microsoft azl3_cri-tools_1.32.0-10 | No range specified | — |
| microsoft azl3_docker-buildx_0.14.0-19 | No range specified | — |
| microsoft azl3_docker-compose_2.27.0-16 | No range specified | — |
| microsoft azl3_gh_2.102.0-2 | No range specified | — |
| microsoft azl3_influxdb_2.7.5-22 | No range specified | — |
| microsoft azl3_kube-vip-cloud-provider_0.0.10-11 | No range specified | — |
| microsoft azl3_kubevirt_1.8.4-4 | No range specified | — |
| microsoft azl3_packer_1.9.5-23 | No range specified | — |
| microsoft azl3_sriov-network-device-plugin_3.7.0-9 | No range specified | — |
| microsoft azl3_telegraf_1.31.0-35 | No range specified | — |
| microsoft azl3_application-gateway-kubernetes-ingress_1.7.7-6 | No range specified | — |
| microsoft azl3_dasel_2.8.1-5 | No range specified | — |
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