CVE-2020-29509

Name: CVE-2020-29509
Creator: NVD / NIST
Published: 2020-12-14T20:15:13.06+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.6/10EPSS 2.08%

Last modified Jun 17, 2026

CVE-2020-29509 is a medium-severity vulnerability rated 5.6/10 on the CVSS scale. 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.. EPSS estimates a 2.08% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.6/10

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

EPSS Probability

2.08%

79.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-115

Affected Software

Vendor	Product	Versions
Golang	Go	< 1.17
Netapp	Trident	All versions

References

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

Timeline

Published: Dec 14, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-29509?

How severe is CVE-2020-29509?

CVE-2020-29509 has a CVSS score of 5.6/10 (MEDIUM severity). The EPSS model estimates a 2.08% probability of exploitation in the next 30 days.

How do I fix CVE-2020-29509?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-29509?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST