Denial of service in Moov signedxml XML canonicalization
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.
Summary
Moov signedxml before 1.4.1, including the Go module github.com/moov-io/signedxml, is affected. ExclusiveCanonicalization copies the full accumulated namespace map at every nested element before digest or signature checks, which is uncontrolled resource consumption (CWE-400). A remote unauthenticated attacker can send a small XML document with deeply nested elements and many unused namespace declarations through ValidateReferences, causing memory use to grow until the process terminates.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
Description from the CNA
Moov signedxml is a pure Go library for processing signed XML documents. Prior to 1.4.1, ExclusiveCanonicalization in exclusivecanonicalization.go copies the complete accumulated namespace map at every nested element before reference digest or signature checks. Attacker-controlled XML containing deeply nested elements with many unused namespace declarations causes quadratic allocation growth with depth and linear growth with prefixes per level, allowing a comparatively small document to consume multiple gigabytes of memory and terminate the process. The condition is reachable through ValidateReferences without a valid signature, matching certificate, or prior authentication, and it does not bypass signature verification. This issue is fixed in version 1.4.1.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| moov-io | signedxml | before 1.4.1 | 1.4.1 | Patch available | CNA |
| — | github.com/moov-io/signedxml (Go) | before 1.4.1 | 1.4.1 | Patch available | GHSA-5588-rp99-5fjh |
- signedxml Vendormoov-io Affected before 1.4.1 Fixed in 1.4.1 Patch available CNA
- github.com/moov-io/signedxml (Go) Vendor— Affected before 1.4.1 Fixed in 1.4.1 Patch available GHSA-5588-rp99-5fjh
Remediation
Upgrade to version 1.4.1, the fixed version for the moov-io signedxml package and the github.com/moov-io/signedxml Go module.
Written with Claude Haiku 5.5 from the sources below · 2026-11-06
- Fix · CNA signedxml (moov-io) Fixed in 1.4.1
- Fix · GHSA-5588-rp99-5fjh github.com/moov-io/signedxml (Go) Fixed in 1.4.1 Advisory →
Vendor assessments
Timeline
- 2026-10-21 Threatist record created from CVE-2026-113729
- 2026-10-21 Alias added: GHSA-5588-rp99-5fjh
- 2026-10-21 Fix available: Go/github.com/moov-io/[email protected] · GHSA-5588-rp99-5fjh
- 2026-10-21 CVSS score added · GHSA-5588-rp99-5fjh
- 2026-10-21 Weakness changed · GHSA-5588-rp99-5fjh
- 2026-10-21 5 new references · GHSA-5588-rp99-5fjh
- 2026-10-22 Priority changed: MEDIUM → LOW
- 2026-10-27 CISA SSVC decision points changed
- 2026-11-06 Affected versions changed · Red Hat
- 2026-11-06 CVSS score added · Red Hat
References
Sources
- CVE-2026-113729 · CVE Program
- CVE-2026-113729 · NVD
- FIRST EPSS
- GHSA-5588-rp99-5fjh · GitHub Advisory Database · CC BY 4.0
- CVE-2026-113729 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences