GO-2026-6866 CVE-2026-97045

Check all ancestor namespace transitions when rendering raw text in html in golang.org/x/net

Not rated yet Go

Severity: Not rated yet; No source has published a CVSS score yet
Exploit chance (EPSS): 0.20%; Chance of exploitation in the next 30 days. Higher than 10.12% of scored vulnerabilities.
Known exploited: No; Not in CISA's catalog
Weakness: —; Not classified
Fix: 0.62.0; Upgrade golang.org/x/net to this version or later

Description

In childTextNodesAreLiteral, walking up the tree previously stopped at the nearest foreign ancestor once an HTML integration point was found. However, that integration point may itself be a descendant of an element that was foster-parented into a foreign namespace (such as <mglyph> or <malignmark> fostered under <mtext>), causing a parser to resolve the subtree in a different foreign namespace upon re-parsing the rendered output.

Continue walking the full ancestor chain and verify that every transition from a non-empty namespace occurs at an HTML integration point before emitting literal text.

Affected versions

Go

Package	Vulnerable	Fixed in
golang.org/x/net	`< 0.62.0`	`0.62.0`

How to fix

Move to the fixed version or later with your package manager, update the lockfile, and run your tests. If the package only arrives through another dependency, upgrade that dependency first. If none of its releases pulls a fixed version yet, force the version with your package manager's override.

golang.org/x/net Go → `0.62.0`

go

go get golang.org/x/net@v0.62.0 && go mod tidy

References

Fixes and patches

go.dev/cl/855121

Issue reports

go.dev/issue/82622

Timeline

Oct 27, 2026 Published
Oct 28, 2026 Last updated by the source
Nov 1, 2026 Latest EPSS score

Advisory	Severity	Why it's related
GHSA-4374-p667-p6c8 HTTP/2 rapid reset can cause excessive work in net/http	High Known exploited	Also affects golang.org/x/net
GHSA-qppj-fm5r-hxr3 HTTP/2 Stream Cancellation Attack	Medium Known exploited	Also affects golang.org/x/net
GO-2026-6860 Avoid quadratic complexity when coalescing text nodes in html in golang.org/x/net	Not rated yet	Also affects golang.org/x/net
GO-2026-6617 HTTP/2 server crash due to HPACK encoder race in net/http	High	Also affects golang.org/x/net
GO-2026-6612 Double flow control refund on HTTP/2 server streams in net/http	Critical	Also affects golang.org/x/net
GO-2026-6611 Excessive CPU consumption from repeated initial window changes in net/http	High	Also affects golang.org/x/net
GO-2026-6610 HTTP/2 transport accepts malformed framing-related headers in net/http	High	Also affects golang.org/x/net
GO-2026-6603 HTTP/2 server memory exhaustion due to Trailer headers in net/http	High	Also affects golang.org/x/net

Credits: Ali Sherif (https://www.linkedin.com/in/ali-sherif-13812b276)

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