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Vulnerability record · CVE-2020-29509 · published 14 December 2020

CVE-2020-29509: Golang go vulnerability

Golang · Go

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.

5.6 CVSS 3.1 Medium EPSS 2.1% · top 19.1% CWE-115 · CWE-115
5.6CVSS 3.1 base score, v2 6.8
2.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md Third Party Advisory
https://security.netapp.com/advisory/ntap-20210129-0006/ Third Party Advisory
https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md Third Party Advisory
https://security.netapp.com/advisory/ntap-20210129-0006/ Third Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-29509), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.