Nx Console / TanStack / DAEMON Tools supply-chain cascade lands three CISA KEV entries

Background. The CISA KEV adds on 2026-05-27 close a chain of disclosures across the preceding three weeks that share a single operational pattern: trusted developer-tooling-publishing pipelines (a maintainer's machine, a vendor build server, a popular VS Code marketplace listing) used to push malicious code to downstream consumers at scale (CISA KEV catalog; Nx postmortem, 2026-05-19; GHSA-c9j4-9m59-847w, 2026-05-18; GHSA-g7cv-rxg3-hmpx, 2026-05-11; Disc Soft Limited, 2026-05-06; Kaspersky, 2026-05-05; Help Net Security, 2026-05-21). This brief has covered the upstream story before — campaign:mini-shai-hulud (TeamPCP) and the 2026-05-24 Packagist Laravel-Lang deep dive both documented the same class of postinstall / publish-token theft chain. The Nx Console / TanStack thread is materially new because three of its CVEs were promoted to CISA KEV on the same day (2026-05-27), confirming active in-the-wild exploitation, and because GitHub's CISO Alexis Wales publicly confirmed that the resulting credential-harvest reached approximately 3,800 internal GitHub repositories along with Grafana Labs.

The TanStack → Nx Console pivot — CVE-2026-45321 and CVE-2026-48027.

The chain begins on or before 2026-05-11 with GHSA-g7cv-rxg3-hmpx (CVE-2026-45321): malicious versions across approximately 42 @tanstack/* npm packages were published with a credential-stealing payload that read locally configured credentials and exfiltrated them — including a Nx contributor's GitHub CLI OAuth token. The Nx postmortem specifically names @tanstack/zod-adapter@1.166.15 as the resolved malicious dependency on the compromised contributor's machine. Mapped to T1195.002 Compromise Software Supply Chain → T1552.001 Unsecured Credentials: Credentials In Files. Seven days later, the attacker used the stolen token to publish Nx Console v18.95.0 (CVE-2026-48027, GHSA-c9j4-9m59-847w) via the legitimate publish path. The malicious version was live on the Visual Studio Marketplace from 12:30 to 12:48 UTC on 2026-05-18 and on Open VSX from 12:33 to 13:09 UTC. Nx Console is a VS Code extension with approximately 2.2 million reported installs; during the live window it fetched an obfuscated second-stage payload that harvested secrets from 1Password vaults, Claude Code configuration files, the developer's npm authentication, additional GitHub PATs, and AWS credentials from ~/.aws/credentials.

The Nx postmortem maps the publish-step compromise cleanly: the stolen GitHub CLI OAuth token had repo and write:packages scope on the maintainer's machine, which was enough to push a new tag and trigger the existing publish workflow without further authentication. The CI workflow ran in GitHub-hosted runners with the regular publish secrets — no additional human-in-the-loop on the publish step. This is the same architectural class of compromise as the earlier TeamPCP mini-shai-hulud chain covered in briefs/2026-05-13.md and the Packagist Laravel-Lang autoloader-backdoor covered in briefs/2026-05-24.md: a stolen developer credential turned into automated downstream-publish without secondary review.

CVE-2026-8398 — DAEMON Tools Lite signed-build trojanisation.

CVE-2026-8398 covers a separate but parallel compromise of the official Disc Soft Limited build pipeline. DAEMON Tools Lite versions 12.5.0.2421 through 12.5.0.2434, distributed from 2026-04-08 through 2026-05-05, contained trojanised DTHelper.exe, DiscSoftBusServiceLite.exe, and DTShellHlp.exe binaries signed with a valid AVB Disc Soft code-signing certificate and beaconing to attacker infrastructure on activation (Disc Soft Limited, 2026-05-06; Kaspersky, 2026-05-05). Kaspersky identified thousands of attempted secondary-payload installs against affected hosts during the six-week distribution window. The Disc Soft vendor advisory confirms the build infrastructure itself was compromised — the malicious binaries went through the legitimate signing path, not via a publication-credential theft. Safe version: 12.6.0+. The CVE moved to CISA KEV on 2026-05-27 on the strength of in-the-wild exploitation evidence Kaspersky and other vendors contributed.

Downstream impact — what GitHub and Grafana Labs publicly confirmed.

Help Net Security reported on 2026-05-21 (Help Net Security, 2026-05-21) that GitHub CISO Alexis Wales had publicly named the malicious Nx Console v18.95.0 extension as the root-cause vector for the earlier 2026 GitHub breach in which ~3,800 internal repositories were exfiltrated. Grafana Labs separately reported a breach traced to the same vector. The downstream-victim pattern is operationally significant: a single malicious VS Code extension live for 18 minutes was enough to reach internal corporate networks via developer-endpoint credential harvesting.

Detection and hardening — what to push to operators today.

ATT&CK mapping: T1195.002 Compromise Software Supply Chain (publish-path compromise), T1552.001 Unsecured Credentials: Credentials In Files (1Password / ~/.aws/credentials / Claude Code config harvesting), T1530 Data from Cloud Storage Object (downstream CI/CD secret reuse), T1567 Exfiltration Over Web Service.

Detection: EDR parent-process lineage vscode.exe / cursor.exe / windsurf.exe spawning node.exe with outbound network egress to non-standard hosts (Extension Host Worker is the legitimate child; secondary node.exe workers fetching obfuscated payloads are not); audit VS Code extension marketplace installs across the developer estate against an approved-extensions allowlist; flag any installation of nrwl.angular-console (the Nx Console publisher ID) at a version pinned to 18.95.0. For DAEMON Tools Lite: hunt for DTHelper.exe or DTShellHlp.exe invocations with parent-process or file-modify timestamps inside the 2026-04-08 → 2026-05-05 window and a hash that does not match the post-12.6.0 reference set (use the vendor's published file-list, do not redistribute hashes here).

Hardening: enforce an organisational policy controls list for VS Code / Cursor / Windsurf extensions (the marketplaces do not enforce mandatory code-signing on extensions); pin npm dependencies with lockfile + --ignore-scripts for CI/CD builds; require human approval for any package that adds or modifies postinstall / preinstall / install scripts; rotate every CI/CD secret, npm token, GitHub PAT, and AWS access key accessible from any host that ran an affected Nx Console version between 2026-05-18 12:30 and 13:09 UTC. For developer endpoints, treat any host that installed an extension from Open VSX or VS Code Marketplace in that window as potentially compromised — credential rotation is not optional.