Nx: Zip-Slip in the self-hosted remote cache

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

Nx is a monorepo solution for TypeScript and polyglot codebases. From version 20.8.0 until 22.7.7 and 23.0.2, the Nx self-hosted HTTP remote cache extracts downloaded cache artifacts without constraining where files are written. A malicious or on-path (MITM) remote cache server can return a crafted tar archive whose entries escape the cache directory and write to arbitrary locations on the machine running Nx, which can be escalated to remote code execution. Nx's default local cache and Nx Cloud are not affected; only workspaces configured to use a self-hosted remote cache are affected. This issue is fixed in versions 22.7.7 and 23.0.2.

Source published

6 Aug 2026 20:07:09 UTC

Source modified

8 Aug 2026 02:33:11 UTC

Observed here

23 Oct 2026 15:48:27 UTC

Source terms

CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: cve-program · CVE Program Terms of Use. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Nx is a monorepo solution for TypeScript and polyglot codebases. From version 20.8.0 until 22.7.7 and 23.0.2, the Nx self-hosted HTTP remote cache extracts downloaded cache artifacts without constraining where files are written. A malicious or on-path (MITM) remote cache server can return a crafted tar archive whose entries escape the cache directory and write to arbitrary locations on the machine running Nx, which can be escalated to remote code execution. Nx's default local cache and Nx Cloud are not affected; only workspaces configured to use a self-hosted remote cache are affected. This issue is fixed in versions 22.7.7 and 23.0.2.

Source published

6 Aug 2026 22:18:31 UTC

Source modified

24 Oct 2026 15:10:00 UTC

Observed here

25 Oct 2026 15:18:57 UTC

Source terms

NIST NVD usage terms; underlying source attribution retained

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: nvd · NIST NVD usage terms; underlying source attribution retained. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS 4.0 · [email protected] · Secondary · 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

## Summary The Nx **self-hosted HTTP remote cache** extracts downloaded cache artifacts without constraining where files are written. A malicious — or on-path (MITM) — remote cache server can return a crafted tar archive whose entries escape the cache directory and write to arbitrary locations on the machine running Nx. This arbitrary file write can be escalated to remote code execution. The directly exploitable issue is the self-hosted HTTP remote cache. ## Affected Packages > [!IMPORTANT] > **Nx's default local cache and Nx Cloud are NOT affected.** The default local cache and Nx Cloud use separate cache retrieval and extraction mechanisms that does not have this vulnerability. Only workspaces that use a self-hosted remote cache (`NX_SELF_HOSTED_REMOTE_CACHE_SERVER`, `@nx/s3-cache`, etc.) are affected. Two self-hosted cache surfaces are affected: 1. **The built-in HTTP remote cache** (`NX_SELF_HOSTED_REMOTE_CACHE_SERVER`, in `nx`) — **fixed** in the patched release. 2. **The self-hosted cache packages** — `@nx/s3-cache`, `@nx/gcs-cache`, `@nx/azure-cache`, `@nx/shared-fs-cache` (and their `@nx/powerpack-*` predecessors) — the same flaw in their own extractor. **Deprecated** (CVE-2025-36852) and not patched; migrate off (see Remediation). The shared step that copies cached outputs into the workspace was also part of the exposure and is hardened in the patched `nx` release. ## Remediation **Upgrade to Nx `22.7.7` or `23.0.2` (or later).** The patched extractor is a drop-in — no configuration change is required. ### If you use the S3, GCS, Azure, or shared-filesystem cache packages `@nx/s3-cache`, `@nx/gcs-cache`, `@nx/azure-cache`, and `@nx/shared-fs-cache` (and their `@nx/powerpack-*` predecessors) are separately versioned packages and are **already deprecated** (see CVE-2025-36852). Upgrading `nx` hardens the shared restore step, but it does not fully secure these packages. The remediation for them is to **migrate off** — to Nx Cloud or the self-hosted OpenAPI/HTTP remote cache — per the deprecation guidance: https://nx.dev/docs/reference/deprecated/self-hosted-cache-packages ## Details When Nx retrieves an artifact from the self-hosted HTTP remote cache, it downloads a gzipped tar archive and extracts it. The extractor joined each untrusted tar entry name directly onto the output directory and unpacked it with `tar`'s **unguarded** `Entry::unpack()`, which performs no containment check: ```rust // vulnerable let path_on_disk = output_dir.join(entry_path); // entry_path is attacker-controlled fs::create_dir_all(path_on_disk.parent()…)?; entry.unpack(&path_on_disk)?; ``` In addition, restore now copies **only** the declared task outputs (never the whole cache directory), confined to the workspace root; parent directories are realized as real directories so a write can never traverse a symlink; declared outputs that resolve outside the workspace are rejected; and the malformed-input cases return errors instead of panicking. ## References - Fix: https://github.com/nrwl/nx/pull/36116 (merged) - TLS-verification warning follow-up: https://github.com/nrwl/nx/pull/36132 (merged) - Vulnerable extractor introduced in Nx 20.8.0: https://github.com/nrwl/nx/pull/30593 ## Credits - **Lidor B.**, Novee Security — Reporter - **Assaf Levkovich**, Novee Security — Reporter

Source published

6 Aug 2026 20:10:03 UTC

Source modified

6 Aug 2026 20:25:59 UTC

Observed here

24 Oct 2026 13:17:17 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · GitHub Advisory Database · CC-BY-4.0. Source text is retained; field grouping and change labels are provided by ChangeIntel.

CVSS_V4 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Publisher rating · HIGH