CVE-2023-34205: In Moov signedxml through 1.0.0, parsing the raw XML (as received) can result in different output than parsing

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CRITICAL 9.1REMOTEDOWNGRADE

CVE-2023-34205 is a critical-severity flaw (CVSS 9.1) affecting signedxml. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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).

Why this priority

Critical severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 67%)
CISA exploited list	No
Weakness	CWE-347
Published	2023-05-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: moov

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-05-30 04:15 UTCPublished CVE record published
2026-06-17 06:03 UTCUpdated Record last modified

moov signedxml DOWNGRADE

Affected: 1.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0.0

1. Check installed version

apt-cache policy signedxml || rpm -q signedxml || signedxml --version

2. No fixed release: DOWNGRADE to a release before 1.0.0 (Debian / Ubuntu)

apt-cache madison signedxml sudo apt install signedxml=<VERSION_BEFORE_1.0.0> sudo apt-mark hold signedxml

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list signedxml sudo dnf downgrade signedxml-<VERSION_BEFORE_1.0.0> sudo dnf versionlock add signedxml

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-34205?

signedxml: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2023-34205 being exploited?

CVE-2023-34205 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-34205 affect?

CVE-2023-34205 affects signedxml. Severity is critical (CVSS 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).

How urgent is CVE-2023-34205?

Priority 45/100. Critical severity; Remotely exploitable, no login, no user action

References

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