PYSEC-2026-1825 PyMdown Extensions has a ReDOS bug in its Figure Capture extension

Impact This issue describes a ReDOS bug found within the figure caption extension pymdownx.blocks.caption . In systems that take unchecked user content, this could cause long hangs when processing the data if a malicious payload was crafted. Patches This issue is patched in Release 10.16.1...

urllib3 allows an unbounded number of links in the decompression chain

Impacturllib3 supports chained HTTP encoding algorithms for response content according to RFC 9110 e.g., Content-Encoding: gzip, zstd.However, the number of links in the decompression chain was unbounded allowing a malicious server to insert a virtually unlimited number of compression steps leadi...

PYSEC-2026-1998 urllib3 allows an unbounded number of links in the decompression chain

Impact urllib3 supports chained HTTP encoding algorithms for response content according to RFC 9110 e.g., Content-Encoding: gzip, zstd. However, the number of links in the decompression chain was unbounded allowing a malicious server to insert a virtually unlimited number of compression steps...

PYSEC-2026-1696 NiceGUI Stored/Reflected XSS in ui.interactive_image via unsanitized SVG content

Summary A Cross-Site Scripting XSS vulnerability exists in the ui.interactiveimage component of NiceGUI v3.3.1 and earlier. The component renders SVG content using Vue's v-html directive without any sanitization. This allows attackers to inject malicious HTML or JavaScript via the SVG tag. Detail...

PYSEC-2026-1832 pypdf's LZWDecode streams be manipulated to exhaust RAM

Impact An attacker who uses this vulnerability can craft a PDF which leads to a memory usage of up to 1 GB per stream. This requires parsing the content stream of a page using the LZWDecode filter. This is a follow up to GHSA-jfx9-29x2-rv3j to align the default limit with the one for zlib. Patche...

PYSEC-2026-1316 Dosage vulnerable to a Directory Traversal through crafted HTTP responses

Impact When downloadinging comic images, Dosage constructs target file names from different aspects of the remote comic page URL, image URL, page content, etc.. While the basename is properly stripped of directory-traversing characters, the file extension is taken from the HTTP Content-Type heade...

PYSEC-2026-1741 Open WebUI vulnerable to Stored DOM XSS via prompts when 'Insert Prompt as Rich Text' is enabled resulting in ATO/RCE

Summary The functionality that inserts custom prompts into the chat window is vulnerable to DOM XSS when 'Insert Prompt as Rich Text' is enabled, since the prompt body is assigned to the DOM sink .innerHtml without sanitisation. Any user with permissions to create prompts can abuse this to plant ...

Tornado vulnerable to excessive logging caused by malformed multipart form data

SummaryWhen Tornado's multipart/form-data parser encounters certain errors, it logs a warning but continues trying to parse the remainder of the data. This allows remote attackers to generate an extremely high volume of logs, constituting a DoS attack. This DoS is compounded by the fact that the...

GO-2026-5804 Remark42: Cross-Site Scripting (XSS) on /api/v1/img via content-type spoofing in github.com/umputun/remark42

Remark42: Cross-Site Scripting XSS on /api/v1/img via content-type spoofing in github.com/umputun/remark42...

GO-2026-5827 gonic has arbitrary file write in createPlaylist: any authenticated user can write playlist M3U content to attacker-controlled path on the host in go.senan.xyz/gonic

gonic has arbitrary file write in createPlaylist: any authenticated user can write playlist M3U content to attacker-controlled path on the host in go.senan.xyz/gonic...

PYSEC-2026-1504 Label Studio allows Cross-Site Scripting (XSS) via GET request to `/projects/upload-example` endpoint

Description Label Studio's /projects/upload-example endpoint allows injection of arbitrary HTML through a GET request with an appropriately crafted labelconfig query parameter. By crafting a specially formatted XML label config with inline task data containing malicious HTML/JavaScript, an attack...

PYSEC-2026-1472 Jinja has a sandbox breakout through malicious filenames

A bug in the Jinja compiler allows an attacker that controls both the content and filename of a template to execute arbitrary Python code, regardless of if Jinja's sandbox is used. To exploit the vulnerability, an attacker needs to control both the filename and the contents of a template. Whether...

PYSEC-2026-1613 Synapse allows unsupported content types to lead to memory exhaustion

Impact In Synapse before 1.120.1, multipart/form-data requests can in certain configurations transiently increase memory consumption beyond expected levels while processing the request, which can be used to amplify denial of service attacks. Patches Synapse 1.120.1 resolves the issue by denying...

PYSEC-2026-1123 Ansible-Core vulnerable to content protections bypass

A flaw was found in Ansible-Core. This vulnerability allows attackers to bypass unsafe content protections using the hostvars object to reference and execute templated content. This issue can lead to arbitrary code execution if remote data or module outputs are improperly templated within playboo...

PYSEC-2026-1860 Werkzeug possible resource exhaustion when parsing file data in forms

Applications using Werkzeug to parse multipart/form-data requests are vulnerable to resource exhaustion. A specially crafted form body can bypass the Request.maxformmemorysize setting. The Request.maxcontentlength setting, as well as resource limits provided by deployment software and platforms,...

PYSEC-2026-1306 Reverb use after free vulnerability

There exists a use after free vulnerability in Reverb. Reverb supports the VARIANT datatype, which is supposed to represent an arbitrary object in C++. When a tensor proto of type VARIANT is unpacked, memory is first allocated to store the entire tensor, and a ctor is called on each instance...

PYSEC-2026-1599 Mage AI Path Traversal vulnerability

Mage AI allows remote users with the "Viewer" role to leak arbitrary files from the Mage server due to a path traversal in the "Git Content" request...

PYSEC-2026-1601 Mage AI Path Traversal vulnerability

Mage AI allows remote users with the "Viewer" role to leak arbitrary files from the Mage server due to a path traversal in the "File Content" request...

PYSEC-2026-1914 Sentry vulnerable to stored Cross-Site Scripting (XSS)

Impact An unsanitized payload sent by an Integration platform integration allows the storage of arbitrary HTML tags on the Sentry side. This payload could subsequently be rendered on the Issues page, creating a Stored Cross-Site Scripting XSS vulnerability. This vulnerability might lead to the...

PYSEC-2026-1302 TinyMCE Cross-Site Scripting (XSS) vulnerability using noscript elements

Impact A cross-site scripting XSS vulnerability was discovered in TinyMCE’s content parsing code. This allowed specially crafted noscript elements containing malicious code to be executed when that content was loaded into the editor. Patches This vulnerability has been patched in TinyMCE 7.2.0,...