Medium
Security advisory
The encoding/xml package in Go (all versions) does not correctly preserve the semantics of attribute namespace prefixes during tokenization round-trips, which allows an attacker to craft inputs that behave in conflicting ways during different stages of processing in affected downstream applications.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2020-29509
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 07:40 UTC · Revision 1
Source evidence
The encoding/xml package in Go (all versions) does not correctly preserve the semantics of attribute namespace prefixes during tokenization round-trips, which allows an attacker to craft inputs that behave in conflicting ways during different stages of processing in affected downstream applications.
osv:CVE-2020-29509
Complete source record
{
"id": "7dcf43047252cb8f25458210850a76b0dc849a462ebeebc45115c903787ba496",
"url": "https://osv.dev/vulnerability/CVE-2020-29509",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2020-29509",
"summary": "The encoding/xml package in Go (all versions) does not correctly preserve the semantics of attribute namespace prefixes during tokenization round-trips, which allows an attacker to craft inputs that behave in conflicting ways during different stages of processing in affected downstream applications.",
"evidence": "osv:CVE-2020-29509",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2020-29509",
"aliases": [
"BIT-golang-2020-29509",
"CVE-2020-29509",
"GHSA-xhqq-x44f-9fgg",
"GO-2021-0060"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/golang/go",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "ec5170397c724a8ae440b2bc529f857c86f0e6b1"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:golang:go:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "1.17"
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"source": "CPE_RANGE"
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"database_specific": {
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],
"modified": "2026-10-24T10:30:56.401585045Z",
"provider": "osv",
"references": [
"https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md",
"https://security.netapp.com/advisory/ntap-20210129-0006/"
],
"provider_metadata": {}
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"related_cves": [
{
"value": "CVE-2020-29509",
"evidence": "/id"
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"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 438669,
"published_at": "2020-12-14T20:15:13.06+00:00"
}