CVE-2020-29509 Authentication Bypass in github.com/russellhaering/gosaml2

What is CVE-2020-29509?

CVE-2020-29509 is a critical vulnerability in Golang Go, published on 14 Dec 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-115

Which versions are affected by CVE-2020-29509?

4 open source packages ship an affected version, including golang and github.com/russellhaering/gosaml2. It affects 2 products.

Products include Golang Go, Netapp Trident.

How do I fix CVE-2020-29509?

Upgrade golang to 1.17.0 or later.

Is CVE-2020-29509 being exploited?

There is no known exploitation of CVE-2020-29509 in the wild and no public exploit code.

Other vulnerabilities in Golang Go

• CVE-2020-0601 Microsoft Windows CryptoAPI Spoofing Exploited High 8.1
• CVE-2026-27143 Missing bound checks can lead to memory corruption in safe Go in cmd/compile Critical 9.8
• CVE-2024-24790 Unexpected behavior from Is methods for IPv4-mapped IPv6 addresses in net/netip Critical 9.8
• CVE-2023-39320 Arbitrary code execution via go.mod toolchain directive in cmd/go Critical 9.8
• CVE-2023-24540 Improper handling of JavaScript whitespace in html/template Critical 9.8

All Golang Go vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-6448, AZL-78900, BIT-golang-2020-29509, DEBIAN-CVE-2020-29509, GHSA-xhqq-x44f-9fgg, GO-2021-0060 and 2 more.