CVE-2026-113729 Moov signedxml: Unauthenticated denial of service in exclusive XML canonicalization
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-113729?
CVE-2026-113729 is a high-severity vulnerability in moov-io signedxml, published on 20 Oct 2026.
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.
Which versions are affected by CVE-2026-113729?
2 open source packages ship an affected version, including github.com/moov-io/signedxml.
| Package | Affected | Fixed in |
|---|---|---|
github.com/moov-io/signedxml Go | All versions | 1.4.1 |
github.com/moov-io/signedxml Go | All versions | 1.4.1 |
How do I fix CVE-2026-113729?
Upgrade github.com/moov-io/signedxml to 1.4.1 or later.
Is CVE-2026-113729 being exploited?
There is no known exploitation of CVE-2026-113729 in the wild and no public exploit code.
Sources
Also known as GHSA-5588-rp99-5fjh.