Affected: Homebrew: marked

### Impact

_What kind of vulnerability is it?_

Denial of service.

The regular expression `block.def` may cause catastrophic backtracking against some strings. PoC is the following.

```javascript import * as marked from "marked";

marked.parse(`[x]:${' '.repeat(1500)}x ${' '.repeat(1500)} x`); ```

_Who is impacted?_

Anyone who runs untrusted markdown through marked and does not use a worker with a time limit.

### Patches

_Has the problem been patched?_

Yes

_What versions should users upgrade to?_

4.0.10

### Workarounds

_Is there a way for users to fix or remediate the vulnerability without upgrading?_

Do not run untrusted markdown through marked or run marked on a [worker](https://marked.js.org/using_advanced#workers) thread and set a reasonable time limit to prevent draining resources.

### References

_Are there any links users can visit to find out more?_

- https://marked.js.org/using_advanced#workers - https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS

### For more information

If you have any questions or comments about this advisory:

* Open an issue in [marked](https://github.com/markedjs/marked)

Marked is a markdown parser and compiler. Prior to version 4.0.10, the regular expression `block.def` may cause catastrophic backtracking against some strings and lead to a regular expression denial of service (ReDoS). Anyone who runs untrusted markdown through a vulnerable version of marked and does not use a worker with a time limit may be affected. This issue is patched in version 4.0.10. As a workaround, avoid running untrusted markdown through marked or run marked on a worker thread and set a reasonable time limit to prevent draining resources.

Affected: npm: marked

### Impact

_What kind of vulnerability is it?_

Denial of service.

The regular expression `block.def` may cause catastrophic backtracking against some strings. PoC is the following.

```javascript import * as marked from "marked";

marked.parse(`[x]:${' '.repeat(1500)}x ${' '.repeat(1500)} x`); ```

_Who is impacted?_

Anyone who runs untrusted markdown through marked and does not use a worker with a time limit.

### Patches

_Has the problem been patched?_

Yes

_What versions should users upgrade to?_

4.0.10

### Workarounds

_Is there a way for users to fix or remediate the vulnerability without upgrading?_

Do not run untrusted markdown through marked or run marked on a [worker](https://marked.js.org/using_advanced#workers) thread and set a reasonable time limit to prevent draining resources.

### References

_Are there any links users can visit to find out more?_

- https://marked.js.org/using_advanced#workers - https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS

### For more information

If you have any questions or comments about this advisory:

* Open an issue in [marked](https://github.com/markedjs/marked)

ramda: prototype poisoning eventsource: Exposure of Sensitive Information golang: net/http: improper sanitization of Transfer-Encoding header golang: net/http/httputil: ReverseProxy should not forward unparseable query parameters marked: regular expression block.def may lead Denial of Service marked: regular expression inline.reflinkSearch may lead Denial of Service grafana: Use of Cache Containing Sensitive Information golang: encoding/pem: fix stack overflow in Decode Moment.js: Path traversal in moment.locale grafana: An information leak issue was discovered in Grafana through 7.3.4, when integrated with Zabbix golang: net/http: handle server errors after sending GOAWAY golang: encoding/xml: stack exhaustion in Decoder.Skip golang: crypto/elliptic: panic caused by oversized scalar golang: syscall: faccessat checks wrong group golang: crypto/tls: session tickets lack random ticket_age_add golang: io/fs: stack exhaustion in Glob golang: compress/gzip: stack exhaustion in Reader.Read golang: path/filepath: stack exhaustion in Glob golang: encoding/xml: stack exhaustion in Unmarshal golang: encoding/gob: stack exhaustion in Decoder.Decode grafana: stored XSS vulnerability grafana: OAuth account takeover grafana: plugin signature bypass grafana: data source and plugin proxy endpoints leaking authentication tokens to some destination plugins golang: net/http/httputil: NewSingleHostReverseProxy - omit X-Forwarded-For not working golang: math/big: decoding big.Float and big.Rat…

Affected: Ubuntu:16.04:LTS: node-marked, Ubuntu:18.04:LTS: node-marked, Ubuntu:20.04:LTS: node-marked, Ubuntu:22.04:LTS: node-marked, Ubuntu:24.04:LTS: node-marked, Ubuntu:25.10: node-marked, Ubuntu:26.04:LTS: node-marked

Marked is a markdown parser and compiler. Prior to version 4.0.10, the regular expression `block.def` may cause catastrophic backtracking against some strings and lead to a regular expression denial of service (ReDoS). Anyone who runs untrusted markdown through a vulnerable version of marked and does not use a worker with a time limit may be affected. This issue is patched in version 4.0.10. As a workaround, avoid running untrusted markdown through marked or run marked on a worker thread and set a reasonable time limit to prevent draining resources.

Ein entfernter, anonymer, authentisierter oder lokaler Angreifer kann mehrere Schwachstellen in IBM Spectrum Protect ausnutzen, um einen 'Denial of Service'-Zustand herbeizuführen, Sicherheitsmaßnahmen zu umgehen, einen 'Cross-Site-Scripting'-Angriff durchzuführen, beliebigen Code auszuführen, sensible Informationen offenzulegen und seine Privilegien zu erweitern.