Cross-Site Scripting (XSS) in serialize-javascript (CVE-2026-97711)
Summary
Cross-site scripting in serialize-javascript (CVE-2026-97711). Risk of unauthorized operations or information disclosure. Exploitable via SCRIPT_CLOSE_REGEXP. Mitigation: upgrade to 7.1.2 or later.
Original description
The description as published by the source.
Impact
serialize-javascript escapes its output so it is safe to embed inside a
element. In 7.1.1 that guarantee does not hold for **function values**: a crafted function body can carry a literal, unescaped
into the output, terminating the script element early so the remainder is
parsed as HTML.
SCRIPT_CLOSE_REGEXP used <\/script[^>]*> as its first alternative. The
character class excludes only >, so a single match could run from one
anywhere in the source — swallowing a second, complete along the way. Only one replacement is emitted
per match, and the plain-code branch neutralizes just the leading <
('< ' + match.slice(1)), so the swallowed tag was re-emitted verbatim.
Reaching that shape requires `' }";
const out = serialize({ h: new Function('return ' + src)() });
// {"h":function f(x){ return x< /script=+/ + '' }}
Embedded as the README documents (`window.S = <%= serialize(state) %>`)
and parsed by Chromium, the script element ends at the injected tag and the
`` becomes a live DOM node with its `onerror` handler executing in the
page origin.
Only the function path is affected. The same payload passed as **data** is
escaped correctly, and `options.isJSON` / non-function values are unaffected.
### Patches
Fixed in **7.1.2**. The wildcard now excludes `<` as well as `>`
(`[^<>]*`), so a match can never reach past a second `<`. Every ``, and emits anything
else as text.
### Workarounds
Upgrade to **7.1.2**. If you cannot upgrade, 7.1.0…
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-2026-97711 has been found in serialize-javascript.
Attackers can target a specific entry point like SCRIPT_CLOSE_REGEXP over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade serialize-javascript to 7.1.2 or later.
If unsure, ask your IT team or search "serialize-javascript CVE-2026-97711" on the vendor's site.
CVE-2026-97711 (serialize-javascript) — CWE-79
Attack surface: SCRIPT_CLOSE_REGEXP / onerror / options.isJSON
Patched: 7.1.2 — 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.
Cross-site scripting (XSS) (CWE-79) exists in serialize-javascript. Attackers reach the vulnerable code path via SCRIPT_CLOSE_REGEXP.
Check the vendor advisory for the affected versions of serialize-javascript. Attack surface: SCRIPT_CLOSE_REGEXP / onerror / options.isJSON.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 7.1.2.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'serialize-javascript' . 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
-
1Identify exposure identify
grep -r 'serialize-javascript' . | 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
serialize-javascriptを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade serialize-javascript to 7.1.2ステージング環境で 7.1.2 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。
-
3Post-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
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-97711 node-serialize-javascript
- Ubuntu UBUNTU-CVE-2026-97711 node-serialize-javascript
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com