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CVE-2023-34205

Signature validation bypass in github.com/moov-io/signedxml

9.1 CriticalFix available

In Moov signedxml through 1.0.0, parsing the raw XML (as received) can result in different output than parsing the canonicalized XML. Thus, signature validation can be bypassed via a Signature Wrapping attack (aka XSW).

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
None

Exploit likelihood

0.39%Up 0.3 points since May 30, 2023
90%50%10%1%

What each source reports

NVD Score used 9.1

In Moov signedxml through 1.0.0, parsing the raw XML (as received) can result in different output than parsing the canonicalized XML. Thus, signature validation can be bypassed via a Signature Wrapping attack (aka XSW).

Record
CVE-2023-34205
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-347
Updated
2026-11-02
CVE List 9.1

In Moov signedxml through 1.0.0, parsing the raw XML (as received) can result in different output than parsing the canonicalized XML. Thus, signature validation can be bypassed via a Signature Wrapping attack (aka XSW).

Record
CVE-2023-34205
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-347
Updated
2026-11-02
EUVDEUVD-2023-1572 9.1

In Moov signedxml through 1.0.0, parsing the raw XML (as received) can result in different output than parsing the canonicalized XML. Thus, signature validation can be bypassed via a Signature Wrapping attack (aka XSW).

Record
EUVD-2023-1572
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-03
GitHub AdvisoriesGHSA-jqvr-j2vg-gjrv 9.1

Signature validation bypass in github.com/moov-io/signedxml

In Moov signedxml through 1.0.0, parsing the raw XML (as received) can result in different output than parsing the canonicalized XML. Thus, signature validation can be bypassed via a Signature Wrapping attack (aka XSW).

Record
GHSA-jqvr-j2vg-gjrv
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-347
Updated
2026-11-02
OSV 9.1

In Moov signedxml through 1.0.0, parsing the raw XML (as received) can result in different output than parsing the canonicalized XML. Thus, signature validation can be bypassed via a Signature Wrapping attack (aka XSW).

Record
CVE-2023-34205
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Updated
2026-11-02
OSVGHSA-jqvr-j2vg-gjrv 9.1

Signature validation bypass in github.com/moov-io/signedxml

In Moov signedxml through 1.0.0, parsing the raw XML (as received) can result in different output than parsing the canonicalized XML. Thus, signature validation can be bypassed via a Signature Wrapping attack (aka XSW).

Record
GHSA-jqvr-j2vg-gjrv
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness
CWE-347
Updated
2026-11-02
OSVGO-2023-1826 No score

Signature validation bypass in github.com/moov-io/signedxml

Signature validation canonicalizes the input XML document before validating the signature. Parsing the uncanonicalized and canonicalized forms can produce different results. An attacker can exploit this variation to bypass signature validation.

Users of signature validation must only parse the canonicalized form of the validated document. The Validator.Validate function does not return the canonical form, and cannot be used safely. Users should only use the Validator.ValidateReferences function and only parse the canonical form which it returns.

The Validator.Validate function was removed in github.com/moov-io/signedxml v1.1.0.

Record
GO-2023-1826
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
github.com/moov-io/signedxml
Go
before 1.1.0
1.1.0

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

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

In short

CVE-2023-34205 is a critical vulnerability (CVSS 9.1) in Moov Signedxml, published May 30, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.39%, the 33rd percentile. Fixed in github.com/moov-io/signedxml 1.1.0.

References

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