dovecot: denial of service via specially crafted NOOP command

A flaw was found in dovecot. An unauthenticated and remote attacker can send a specially crafted "NOOP" command containing numerous open and close parentheses without a command-ending line feed, causing the server to allocate an excessive amount of memory, resulting in a denial of service...

CLSA-2026-1777977059 dovecot: Fix of CVE-2026-27857

CVE-2026-27857: limit the number of open IMAP parser lists in imap-login to prevent excessive memory usage from deeply nested parentheses e.g. NOOP...

CLSA-2026-1777976700 dovecot: Fix of CVE-2026-27857

CVE-2026-27857: limit the number of open IMAP parser lists in imap-login to prevent excessive memory usage from deeply nested parentheses e.g. NOOP...

dovecot: denial of service via specially crafted NOOP command

A flaw was found in dovecot. An unauthenticated and remote attacker can send a specially crafted "NOOP" command containing numerous open and close parentheses without a command-ending line feed, causing the server to allocate an excessive amount of memory, resulting in a denial of service...

📄 Dovecot IMAP NOOP Command Memory Exhaustion Denial of Service

This Metasploit auxiliary module targets a memory exhaustion vulnerability in the Dovecot IMAP service. It opens multiple concurrent TCP connections and sends specially crafted NOOP commands containing deeply nested parentheses to force excessive memory allocation on the server. By sustaining the...

cpython: Missing character filtering in Python

Missing character filtering has been discovered in Python. When folding a long comment in an email header containing exclusively unfoldable characters, the parenthesis would not be preserved. This could be used for injecting headers into email messages where addresses are user-controlled and not...

CVE-2026-27857

A flaw was found in dovecot. An unauthenticated and remote attacker can send a specially crafted "NOOP" command containing numerous open and close parentheses without a command-ending line feed, causing the server to allocate an excessive amount of memory, resulting in a denial of service...

AZL-81707 CVE-2026-27857 affecting package dovecot 2.3.20-1

Sending "NOOP ..." command with 4000 parenthesis open+close results in 1MB extra memory usage. Longer commands will result in client disconnection. This 1 MB can be left allocated for longer time periods by not sending the command ending LF. So attacker could connect possibly from even a single I...

CVE-2026-27857

Sending "NOOP ..." command with 4000 parenthesis open+close results in 1MB extra memory usage. Longer commands will result in client disconnection. This 1 MB can be left allocated for longer time periods by not sending the command ending LF. So attacker could connect possibly from even a single I...

CVE-2026-27857

Sending "NOOP ..." command with 4000 parenthesis open+close results in 1MB extra memory usage. Longer commands will result in client disconnection. This 1 MB can be left allocated for longer time periods by not sending the command ending LF. So attacker could connect possibly from even a single I...

CVE-2026-27857

Sending "NOOP ..." command with 4000 parenthesis open+close results in 1MB extra memory usage. Longer commands will result in client disconnection. This 1 MB can be left allocated for longer time periods by not sending the command ending LF. So attacker could connect possibly from even a single I...

CVE-2026-27857

The CVE-2026-27857 issue affects the Dovecot IMAP server where sending a NOOP with 4000+ parentheses causes about 1 MB of memory to be allocated for each connection. Attackers could spawn many connections (potentially from a single IP) to exhaust VSZ and disrupt the service or other proxied conne...

xgrammar vulnerable to DoS via multi-layer nesting

Summary The multi-level nested syntax caused a segmentation fault core dump. Details A trigger stack overflow or memory exhaustion was caused by constructing a malicious grammar rule containing 30,000 layers of nested parentheses. PoC !/usr/bin/env python3 """ XGrammar - Math Expression Generatio...

CVE-2026-25755

A flaw was found in jsPDF. The addJS method accepts user input without proper sanitization, allowing an attacker to inject arbitrary PDF objects into the document. A specially crafted payload that escapes the JavaScript string delimiter can execute malicious actions or alter the document structur...

GHSA-9VJF-QC39-JPRP jsPDF has a PDF Object Injection via Unsanitized Input in addJS Method

Impact User control of the argument of the addJS method allows an attacker to inject arbitrary PDF objects into the generated document. By crafting a payload that escapes the JavaScript string delimiter, an attacker can execute malicious actions or alter the document structure, impacting any user...

jsPDF has a PDF Object Injection via Unsanitized Input in addJS Method

Impact User control of the argument of the addJS method allows an attacker to inject arbitrary PDF objects into the generated document. By crafting a payload that escapes the JavaScript string delimiter, an attacker can execute malicious actions or alter the document structure, impacting any user...

Improper Encoding or Escaping of Output

Overview jspdf is a PDF Document creation from JavaScript Affected versions of this package are vulnerable to Improper Encoding or Escaping of Output via the addJS method. An attacker can inject arbitrary PDF objects and execute malicious actions or alter the document structure by supplying...

CVE-2026-25755

jsPDF is a library to generate PDFs in JavaScript. Prior to 4.2.0, user control of the argument of the addJS method allows an attacker to inject arbitrary PDF objects into the generated document. By crafting a payload that escapes the JavaScript string delimiter, an attacker can execute malicious...

CVE-2026-25755

The jsPDF JavaScript library (prior to version 4.2.0 ) is vulnerable to PDF Object Injection due to improper sanitization of input in the addJS() method. An attacker can craft a payload that escapes the JavaScript string delimiter to inject arbitrary PDF objects, potentially executing malicious a...

CVE-2026-25755 jsPDF has PDF Object Injection via Unsanitized Input in addJS Method

jsPDF is a library to generate PDFs in JavaScript. Prior to 4.2.0, user control of the argument of the addJS method allows an attacker to inject arbitrary PDF objects into the generated document. By crafting a payload that escapes the JavaScript string delimiter, an attacker can execute malicious...