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CVE-2026-102276 high CVSS 7.5

Vulnerability in brace-expansion (CVE-2026-102276)

Summary

Vulnerability in brace-expansion (CVE-2026-102276). Risk of unauthorized operations or information disclosure. Exploitable via post. Mitigation: upgrade to 1.1.19 or later.

Original description

The description as published by the source.

Summary

parseCommaParts() can exhaust the native stack and crash the process. There are two distinct ways to trigger it, both reachable from a single untrusted pattern string.

This is the parsing-side counterpart to CVE-2026-14257 / GHSA-mh99-v99m-4gvg. That fix made expand_() iterative and documented a constant-stack-depth guarantee, but parseCommaParts() was left recursive, so the guarantee only held for one of the two parsing paths.

Vector 1 - unbounded recursion on post

parseCommaParts() recursed on the remainder of the string once per brace group:

const postParts = parseCommaParts(post)   // unbounded

A brace group containing many comma-separated groups drives one recursion level per group:

expand('{' + '{a},'.repeat(7000) + 'b}')
// RangeError: Maximum call stack size exceeded

About 7,300 repetitions - roughly 29 KB of input - is enough on Node 24; roughly 6,300 (25 KB) on Node 18. The threshold is identical on every affected release line.

Vector 2 - push.apply with an unbounded array

Even with the recursion removed, parseCommaParts() spread whole arrays into an argument list:

p.push.apply(p, postParts)
parts.push.apply(parts, p)

Function.prototype.apply places one argument per element on the stack, so a single large array overflows it. This needs no recursion depth at all - the following reaches a recursion depth of exactly 1:

expand('{{x},' + 'a,'.repeat(125000) + 'b}')
// RangeError: Max…

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-102276 has been found in brace-expansion.
Attackers can target a specific entry point like post over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 7.5/10.
What to do: upgrade brace-expansion to 1.1.19 or later.
If unsure, ask your IT team or search "brace-expansion CVE-2026-102276" on the vendor's site.

CVE-2026-102276 (brace-expansion) — CWE-400 / CVSS v3 7.5
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: post / push.apply / Function.prototype.apply / max
Patched: 1.1.19 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-400) exists in brace-expansion. Attackers reach the vulnerable code path via post without authentication.

📍 Affected scope

Check the vendor advisory for the affected versions of brace-expansion. Attack surface: post / push.apply / Function.prototype.apply / max.

🔥 Severity

Severity: High (CVSS 7.5/10). Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to 1.1.19.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'brace-expansion' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'brace-expansion' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で brace-expansion を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade brace-expansion to 1.1.19

    ステージング環境で 1.1.19 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

npm brace-expansion
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.1.19"}]}]

Fix status by distribution

Fixed packages published by each distribution for this CVE

References

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