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CVE-2020-29511

The encoding/xml package in Go (all versions) does not correctly preserve the semantics of...

9.8 CriticalFix available

The encoding/xml package in Go (all versions) does not correctly preserve the semantics of element 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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

1.97%Up 1.3 points since Apr 14, 2021
90%50%10%1%

What each source reports

CVE List Score used 9.8

The encoding/xml package in Go (all versions) does not correctly preserve the semantics of element 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.

Record
CVE-2020-29511
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-115
Updated
2026-11-02
EUVDEUVD-2020-21878 9.8

The encoding/xml package in Go (all versions) does not correctly preserve the semantics of element 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.

Record
EUVD-2020-21878
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-03
GitHub AdvisoriesGHSA-g7v2-7v9m-q9j4 5.6

The encoding/xml package in Go (all versions) does not correctly preserve the semantics of...

The encoding/xml package in Go (all versions) does not correctly preserve the semantics of element 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.

Record
GHSA-g7v2-7v9m-q9j4
CVSS 3.1
5.6 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Weakness
CWE-115
Updated
2026-11-02
NVD 9.8

The encoding/xml package in Go (all versions) does not correctly preserve the semantics of element 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.

Record
CVE-2020-29511
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1
5.6 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
CVSS 2.0
6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness
CWE-115
Updated
2026-11-02
OSVALPINE-CVE-2020-29511 5.6

The encoding/xml package in Go (all versions) does not correctly preserve the semantics of element 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.

Record
ALPINE-CVE-2020-29511
CVSS 3.1
5.6 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-03
OSVAZL-6449 5.6

CVE-2020-29511 affecting package golang for versions less than 1.20.10-1

The encoding/xml package in Go (all versions) does not correctly preserve the semantics of element 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.

Record
AZL-6449
CVSS 3.1
5.6 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
Show 6 moreShow less
OSVAZL-78896 5.6

CVE-2020-29511 affecting package golang 1.25.7-1

The encoding/xml package in Go (all versions) does not correctly preserve the semantics of element 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.

Record
AZL-78896
CVSS 3.1
5.6 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSVBELL-CVE-2020-29511 5.6

CVE-2020-29511 does not affect BellSoft software

Record
BELL-CVE-2020-29511
CVSS 3.1
5.6 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSV 5.6

The encoding/xml package in Go (all versions) does not correctly preserve the semantics of element 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.

Record
CVE-2020-29511
CVSS 3.1
5.6 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSVDEBIAN-CVE-2020-29511 5.6

The encoding/xml package in Go (all versions) does not correctly preserve the semantics of element 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.

Record
DEBIAN-CVE-2020-29511
CVSS 3.1
5.6 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSVUBUNTU-CVE-2020-29511 9.8

The encoding/xml package in Go (all versions) does not correctly preserve the semantics of element 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.

Record
UBUNTU-CVE-2020-29511
CVSS 3.1
9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.1
5.6 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Updated
2026-11-02
OSVBIT-golang-2020-29511 No score

The encoding/xml package in Go (all versions) does not correctly preserve the semantics of element 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.

Record
BIT-golang-2020-29511
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
go
Alpine:v3.18
 before 1.17-r0
1.17-r0
go
Alpine:v3.19
 before 1.17-r0
1.17-r0
go
Alpine:v3.20
 before 1.17-r0
1.17-r0
go
Alpine:v3.21
 before 1.17-r0
1.17-r0
go
Alpine:v3.22
 before 1.17-r0
1.17-r0
go
Alpine:v3.23
 before 1.17-r0
1.17-r0
go
Alpine:v3.24
 before 1.17-r0
1.17-r0
golang
Azure Linux:2
 1.19.0 up to 1.20.10-1
1.20.10-1
golang
Azure Linux:3
 through 1.25.7-1 None known
golang
Bitnami
 before 1.17.0
1.17.0
Show 12 moreShow less
Affected packages
PackageAffectedFixed
golang-1.15
Debian:11
 All versions, plus listed versions
1.15.15-11.15.15-1~deb11u11.15.15-1~deb11u21.15.15-1~deb11u31.15.15-1~deb11u4
Show 5 moreShow less
1.15.15-21.15.15-31.15.15-41.15.15-51.15.9-6
 None known
golang-1.10
Ubuntu:14.04:LTS
 All versions, plus listed versions
1.10.4-2ubuntu1~14.04.1
 None known
golang-1.10
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.10.4-2ubuntu1~16.04.11.10.4-2ubuntu1~16.04.2
 None known
golang-1.6
Ubuntu:16.04:LTS
 All versions, plus listed versions
1.6-0ubuntu11.6-0ubuntu21.6-0ubuntu31.6-0ubuntu41.6-0ubuntu5
Show 5 moreShow less
1.6.1-0ubuntu11.6.2-0ubuntu5~16.041.6.2-0ubuntu5~16.04.21.6.2-0ubuntu5~16.04.31.6.2-0ubuntu5~16.04.4
 None known
golang-1.13
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
1.13.8-1ubuntu1~16.04.21.13.8-1ubuntu1~16.04.31.13.8-1ubuntu1~16.04.3+esm21.13.8-1ubuntu1~16.04.3+esm3
 None known
golang-1.10
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.10~rc1-11.10~rc1-1ubuntu11.10~rc1-2ubuntu11.10~rc2-1ubuntu11.10-1ubuntu11.10.1-1ubuntu21.10.4-2ubuntu1~18.04.11.10.4-2ubuntu1~18.04.2
 None known
golang-1.13
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
1.13.8-1ubuntu1~18.04.21.13.8-1ubuntu1~18.04.31.13.8-1ubuntu1~18.04.41.13.8-1ubuntu1~18.04.4+esm1
 None known
golang-1.8
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.8.3-2ubuntu11.8.3-2ubuntu1.18.04.1
 None known
golang-1.9
Ubuntu:18.04:LTS
 All versions, plus listed versions
1.9.1-2ubuntu11.9.2-1ubuntu11.9.2-3ubuntu11.9.3-1ubuntu11.9.4-1ubuntu1
 None known
golang-1.13
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.13.1-1ubuntu11.13.3-1ubuntu11.13.4-1ubuntu11.13.5-1ubuntu11.13.6-1ubuntu1
Show 5 moreShow less
1.13.6-2ubuntu11.13.7-1ubuntu11.13.8-1ubuntu11.13.8-1ubuntu1.11.13.8-1ubuntu1.2
 None known
golang-1.14
Ubuntu:20.04:LTS
 All versions, plus listed versions
1.14~beta1-11.14~beta1-21.14~rc1-11.14-11.14.1-1
Show 4 moreShow less
1.14.2-11.14.2-1ubuntu11.14.3-2ubuntu2~20.04.11.14.3-2ubuntu2~20.04.2
 None known
golang-1.13
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
1.13.8-1ubuntu21.13.8-1ubuntu2.22.04.11.13.8-1ubuntu2.22.04.1+esm11.13.8-1ubuntu2.22.04.2
 None known

History

History
RecordedChangedSources
affected, aliases, referencesOSV
aliases, products, publishedEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-29511 is a critical vulnerability (CVSS 9.8) in Ecies Go, published December 14, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.97%, the 80th percentile. Fixed in go 1.17-r0.

References

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