Vulnerability · Published Oct 20, 2026 · Assigned by GitHub_M
CVE-2026-113729Moov signedxml: Unauthenticated denial of service in exclusive XML canonicalization
High 7.5
In plain English
A high-severity uncontrolled resource consumption in signedxml from moov-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/moov-io/signedxml | 1.4.1 | GHSA-5588-rp99-5fjh |
| Go | github.com/moov-io/signedxml | 1.4.1 | GO-2026-6826 |
Affected products (as reported)
Weakness: CWE-400, CWE-407, CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
References
- https://github.com/moov-io/signedxml/security/advisories/GHSA-5588-rp99-5fjh x_refsource_CONFIRM
- https://github.com/moov-io/signedxml/commit/da2cd6126c4c53b7e59a367d287786e6f6a2d0d3 x_refsource_MISC
- https://github.com/moov-io/signedxml/releases/tag/v1.4.1 x_refsource_MISC