GHSA-83g2-8m93-v3w7 BIT-golang-2021-33194 CVE-2021-33194 GO-2021-0238
golang.org/x/net/html Infinite Loop vulnerability
- Severity
- 7.5 / 10
- High · CVSS 3.1
- Exploit chance (EPSS)
- 7.49%
- Chance of exploitation in the next 30 days. Higher than 94.48% of scored vulnerabilities.
- Known exploited
- No
- Not in CISA's catalog
- Weakness
- CWE-835 Loop with Unreachable Exit Condition ('Infinite Loop')
- Fix
0.0.0-20210520170846-37e1c6afe023- Upgrade golang.org/x/net to this version or later
Description
Go through 1.15.12 and 1.16.x through 1.16.4 has a golang.org/x/net/html infinite loop via crafted ParseFragment input.
Affected versions
Go
| Package | Vulnerable | Fixed in |
|---|---|---|
| golang.org/x/net | < 0.0.0-20210520170846-37e1c6afe023 |
0.0.0-20210520170846-37e1c6afe023 |
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 → 0.0.0-20210520170846-37e1c6afe023
- go
go get golang.org/x/net@v0.0.0-20210520170846-37e1c6afe023 && go mod tidy
Severity breakdown
CVSS 3.1 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Weakness
CWE-835: Loop with Unreachable Exit Condition ('Infinite Loop')
The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.
References
Advisories
Other links
- github.com/golang/net/commit/37e1c6afe02340126705deced573a85ab75209d7
- go.dev/cl/311090
- go.dev/issue/46288
- go.googlesource.com/net/+/37e1c6afe02340126705deced573a85ab75209d7
- groups.google.com/g/golang-announce/c/wPunbCPkWUg
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4CHKS…
- pkg.go.dev/vuln/GO-2021-0238
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4CH…
Timeline
- Published
- Last updated by the source
- Latest EPSS score
Related advisories
| 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-2026-6866 Check all ancestor namespace transitions when rendering raw text in html in golang.org/x/net | Not rated yet | 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 |
Credits: Andrew Thornton (reporter), OSS-Fuzz (discovery)
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