Tools: CVE-2026-24686: TUF Luck: Escaping the Sandbox in go-tuf via TAP 4 Map Files

TUF Luck: Escaping the Sandbox in go-tuf via TAP 4 Map Files ## ⚠️ Exploit Status: POC ## Technical Details ## Affected Systems ## Code Analysis ## Commit: d361e2e ## Commit: bde5f18 ## Exploit Details ## Mitigation Strategies ## References Vulnerability ID: CVE-2026-24686 CVSS Score: 9.8 Published: 2026-01-26 A critical Path Traversal vulnerability in the go-tuf TAP 4 Multirepo client allows attackers to overwrite arbitrary files via malicious repository names in the map file. The go-tuf library, widely used for secure software updates, contained a path traversal flaw in its TAP 4 support. By crafting a malicious map file with traversal sequences in repository names (e.g., "../../etc/cron.d"), an attacker can force the client to write metadata files to arbitrary locations on the host system. This turns a routine update check into an Arbitrary File Write primitive, potentially leading to RCE. Fix path traversal in TAP 4 repo names via regex validation Refactor Key.ID() to prevent panics (Pre-cursor work) Read the full report for CVE-2026-24686 on our website for more details including interactive diagrams and full exploit analysis. Templates let you quickly answer FAQs or store snippets for re-use. Are you sure you want to ? It will become hidden in your post, but will still be visible via the comment's permalink. as well , this person and/or CODE_BLOCK: + if !validRepoNamePattern.MatchString(name) { + return fmt.Errorf("%w: %q must start with alphanumeric...", ErrInvalidRepoName, name) + } CODE_BLOCK: + if !validRepoNamePattern.MatchString(name) { + return fmt.Errorf("%w: %q must start with alphanumeric...", ErrInvalidRepoName, name) + } CODE_BLOCK: + if !validRepoNamePattern.MatchString(name) { + return fmt.Errorf("%w: %q must start with alphanumeric...", ErrInvalidRepoName, name) + } - CWE ID: CWE-22 (Path Traversal) - Attack Vector: Network / Local (Configuration) - CVSS v3.1 (Est): 9.8 (Critical) - Impact: Arbitrary File Write / RCE - Affected Component: metadata/multirepo/multirepo.go - Status: Patched - Go applications using the-update-framework/go-tuf - Systems utilizing TAP 4 Multirepo configurations - Supply chain security tools built on go-tuf - theupdateframework/go-tuf: < Commit d361e2ea (Fixed in: Commit d361e2ea) - Internal Research: The fix commit implicitly demonstrates the exploit vector via the added test cases and validation logic. - Input Validation: Enforce strict alphanumeric naming conventions for repositories. - Principle of Least Privilege: Run update clients with minimal filesystem permissions. - Sandboxing: Use filesystem namespaces or containers to limit write access. - Update go-tuf to the latest version containing commit d361e2ea24e427581343dee5c7a32b485d79fcc0. - Audit existing TAP 4 map files for traversal sequences. - Rebuild any applications dependent on the vulnerable library. - go-tuf GitHub Repository - The Update Framework (TUF) Homepage