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CVE-2020-29509

CRITICAL
Published 2020-12-14T20:02:02.448358Z
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CVSS Score

V3.1
9.8
/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score Metrics
Exploitability: N/A Impact: N/A

EPSS Score

v2025.03.14
0.003
probability
of exploitation in the wild

There is a 0.3% chance that this vulnerability will be exploited in the wild within the next 30 days.

Updated: 2025-06-25
Exploit Probability
Percentile: 0.552
Higher than 55.2% of all CVEs

Attack Vector Metrics

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED

Impact Metrics

Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

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.

Available Exploits

No exploits available for this CVE.

Related News

No news articles found for this CVE.

Affected Products

Golang

Go

Affected Versions:

All versions

GitHub Security Advisories

Community-driven vulnerability intelligence from GitHub

✓ GitHub Reviewed CRITICAL

Authentication Bypass in github.com/russellhaering/gosaml2

GHSA-xhqq-x44f-9fgg

Advisory Details

### Impact Given a valid SAML Response, it may be possible for an attacker to mutate the XML document in such a way that gosaml2 will trust a different portion of the document than was signed. Depending on the implementation of the Service Provider this enables a variety of attacks, including users accessing accounts other than the one to which they authenticated in the Identity Provider, or full authentication bypass. ### Patches Service Providers utilizing gosaml2 should upgrade to v0.6.0 or greater.

Affected Packages

Go github.com/russellhaering/gosaml2
ECOSYSTEM: ≥0 <0.6.0

CVSS Scoring

CVSS Score

9.0

CVSS Vector

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

References

WEB https://github.com/russellhaering/gosaml2/security/advisories/GHSA-xhqq-x44f-9fgg
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2020-29509
WEB https://github.com/russellhaering/gosaml2/commit/42606dafba60c58c458f14f75c4c230459672ab9
WEB https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md
WEB https://pkg.go.dev/vuln/GO-2021-0060
WEB https://security.netapp.com/advisory/ntap-20210129-0006

Advisory provided by GitHub Security Advisory Database. Published: February 11, 2022, Modified: May 21, 2021

References

https://github.com/mattermost/xml-roundtrip-validator/blob/master/advisories/unstable-attributes.md
https://security.netapp.com/advisory/ntap-20210129-0006/
Published: 2020-12-14T20:02:02.448358Z
Last Modified: 2024-09-17T03:43:39.703Z
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