#nodejs

### Impact An HTML injection vulnerability in plaintext e-mails generated by Mailgen has been discovered. Your project is affected if you make use of the `Mailgen.generatePlaintext(email);` method and pass in user-generated content. The issue has been discovered and reported by Edoardo Ottavianelli (@edoardottt). ### Patches The vulnerability has been patched in commit https://github.com/eladnava/mailgen/commit/741a0190ddae0f408b22ae3b5f0f4c3f5cf4f11d and released to `npm` in version `2.0.30`. ### Workarounds Strip all HTML tags yourself before passing any content into `Mailgen.generatePlaintext(email);`. Thanks to Edoardo Ottavianelli (@edoardottt) for discovering and reporting this vulnerability.

## Summary Authlib’s JWS verification accepts tokens that declare unknown critical header parameters (`crit`), violating RFC 7515 “must‑understand” semantics. An attacker can craft a signed token with a critical header (for example, `bork` or `cnf`) that strict verifiers reject but Authlib accepts. In mixed‑language fleets, this enables split‑brain verification and can lead to policy bypass, replay, or privilege escalation. ## Affected Component and Versions - Library: Authlib (JWS verification) - API: `authlib.jose.JsonWebSignature.deserialize_compact(...)` - Version tested: 1.6.3 - Configuration: Default; no allowlist or special handling for `crit` ## Details RFC 7515 (JWS) §4.1.11 defines `crit` as a “must‑understand” list: recipients MUST understand and enforce every header parameter listed in `crit`, otherwise they MUST reject the token. Security‑sensitive semantics such as token binding (e.g., `cnf` from RFC 7800) are often conveyed via `crit`. Observed behavior with Authlib 1...

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In the @digitalocean/do-markdownit package through 1.16.1 (in npm), the callout and fence_environment plugins perform .includes substring matching if allowedClasses or allowedEnvironments is a string (instead of an array).

This edition pulls the curtain aside to show the realities of the VPN Filter campaign. Joe reflects on the struggle to prevent burnout in a world constantly on fire.

npm parcel 2.0.0-alpha and before has an Origin Validation Error vulnerability. Malicious websites can send XMLHTTPRequests to the application's development server and read the response to steal source code when developers visit them.

## Summary A Local File Inclusion (LFI) issue was identified in the esm.sh service URL handling. An attacker could craft a request that causes the server to read and return files from the host filesystem (or other unintended file sources). **Severity:** High — LFI can expose secrets, configuration files, credentials, or enable further compromise. **Impact:** reading configuration files, private keys, environment files, or other sensitive files; disclosure of secrets or credentials; information leakage that could enable further attacks. Vulnerable code snippet is in this file: https://github.com/esm-dev/esm.sh/blob/c62f191d32639314ff0525d1c3c0e19ea2b16143/server/router.go#L1168 --- ## Proof of Concept 1. Using this default config file that I copy from the repo, the server is running at `http://localhost:9999` with this command `go run server/esmd/main.go --config=config.json` ```json { "port": 9999, "npmRegistry": "https://registry.npmjs.org/", "npmToken": "******" } ```...

ReversingLabs discovers “Shai-hulud,” a self-replicating computer worm on the npm open-source registry. Learn how the malware steals developer…