CVE-2026-26047

Moodle: moodle: uncontrolled resource consumption in tex formula editor leading to denial of service

A denial-of-service vulnerability was identified in Moodle’s TeX formula editor. When rendering TeX content using mimetex, insufficient execution time limits could allow specially crafted formulas to consume excessive server resources. An authenticated user could abuse this behavior to degrade performance or cause service interruption.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Moodle

Products

Moodle

CVE-2026-40036

Unfurl < 2026.04 - Denial of Service via Unbounded zlib Decompression

Unfurl before 2026.04 contains an unbounded zlib decompression vulnerability in parse_compressed.py that allows remote attackers to cause denial of service. Attackers can submit highly compressed payloads via URL parameters to the /json/visjs endpoint that expand to gigabytes, exhausting server memory and crashing the service.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Dfir-unfurl Ryandfir

Products

Dfir-unfurl Unfurl

CVE-2026-25899

Fiber is Vulnerable to Denial of Service via Flash Cookie Unbounded Allocation

Fiber is an Express inspired web framework written in Go. In versions on the v3 branch prior to 3.1.0, the use of the `fiber_flash` cookie can force an unbounded allocation on any server. A crafted 10-character cookie value triggers an attempt to allocate up to 85GB of memory via unvalidated msgpack deserialization. No authentication is required. Every GoFiber v3 endpoint is affected regardless of whether the application uses flash messages. Version 3.1.0 fixes the issue.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Gofiber

Products

Fiber

CVE-2026-2845

Allocation of Resources Without Limits or Throttling in GitLab

An issue has been discovered in GitLab CE/EE affecting all versions from 11.2 before 18.7.5, 18.8 before 18.8.5, and 18.9 before 18.9.1 that could have allowed an authenticated user to cause denial of service by exploiting a Bitbucket Server import endpoint via repeatedly sending large responses.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Gitlab

Products

Gitlab

CVE-2026-27630

TinyWeb vulnerable to Remote Denial of Service via Thread/Connection Exhaustion (Slowloris)

TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. Versions prior to version 2.02 are vulnerable to a Denial of Service (DoS) attack known as Slowloris. The server spawns a new OS thread for every incoming connection without enforcing a maximum concurrency limit or an appropriate request timeout. An unauthenticated remote attacker can exhaust server concurrency limits and memory by opening numerous connections and sending data exceptionally slowly (e.g. 1 byte every few minutes). Anyone hosting services using TinyWeb is impacted. Version 2.02 fixes the issue. The patch introduces a `CMaxConnections` limit (set to 512) and a `CConnectionTimeoutSecs` idle timeout (set to 30 seconds). As a temporary workaround if upgrading is not immediately possible, consider placing the server behind a robust reverse proxy or Web Application Firewall (WAF) such as nginx, HAProxy, or Cloudflare, configured to buffer incomplete requests and aggressively enforce connection limits and timeouts.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Maximmasiutin Ritlabs

Products

Tinyweb Tinyweb

CVE-2026-27633

TinyWeb has Unbounded Content-Length Memory Exhaustion (DoS)

TinyWeb is a web server (HTTP, HTTPS) written in Delphi for Win32. Versions prior to version 2.02 have a Denial of Service (DoS) vulnerability via memory exhaustion. Unauthenticated remote attackers can send an HTTP POST request to the server with an exceptionally large `Content-Length` header (e.g., `2147483647`). The server continuously allocates memory for the request body (`EntityBody`) while streaming the payload without enforcing any maximum limit, leading to all available memory being consumed and causing the server to crash. Anyone hosting services using TinyWeb is impacted. Version 2.02 fixes the issue. The patch introduces a `CMaxEntityBodySize` limit (set to 10MB) for the maximum size of accepted payloads. As a temporary workaround if upgrading is not immediately possible, consider placing the server behind a Web Application Firewall (WAF) or reverse proxy (like nginx or Cloudflare) configured to explicitly limit the maximum allowed HTTP request body size (e.g., `client_max_body_size` in nginx).

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Maximmasiutin Ritlabs

Products

Tinyweb Tinyweb

CVE-2026-40395

Varnish: Varnish Enterprise: Denial of Service via workspace overflow

Varnish Enterprise before 6.0.16r12 allows a "workspace overflow" denial of service (daemon panic) for shared VCL. The headerplus.write_req0() function from vmod_headerplus updates the underlying req0, which is normally the original read-only request from which req is derived (readable and writable from VCL). This is useful in the active VCL, after amending req, to prepare a refined req0 before switching to a different VCL with the return (vcl(<label>)) action. This is for example how the Varnish Controller operates shared VCL deployments. If the amended req contained too many header fields for req0, this would have resulted in a workspace overflow that would in turn trigger a panic and crash the Varnish Enterprise server. This could be used as a Denial of Service attack vector by malicious clients.

CVSS 3.1 · 4 Medium EPSS < 1% KEV · Not listed

Vendors

Varnish-software

Products

Varnish Enterprise

CVE-2026-27932

joserfc PBES2 p2c Unbounded Iteration Count enables Denial of Service (DoS)

joserfc is a Python library that provides an implementation of several JSON Object Signing and Encryption (JOSE) standards. In 1.6.2 and earlier, a resource exhaustion vulnerability in joserfc allows an unauthenticated attacker to cause a Denial of Service (DoS) via CPU exhaustion. When the library decrypts a JSON Web Encryption (JWE) token using Password-Based Encryption (PBES2) algorithms, it reads the p2c (PBES2 Count) parameter directly from the token's protected header. This parameter defines the number of iterations for the PBKDF2 key derivation function. Because joserfc does not validate or bound this value, an attacker can specify an extremely large iteration count (e.g., 2^31 - 1), forcing the server to expend massive CPU resources processing a single token. This vulnerability exists at the JWA layer and impacts all high-level JWE and JWT decryption interfaces if PBES2 algorithms are allowed by the application's policy.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Authlib Hsiaoming

Products

Joserfc Joserfc

CVE-2026-3520

Multer vulnerable to Denial of Service via uncontrolled recursion

Multer is a node.js middleware for handling `multipart/form-data`. A vulnerability in Multer prior to version 2.1.1 allows an attacker to trigger a Denial of Service (DoS) by sending malformed requests, potentially causing stack overflow. Users should upgrade to version 2.1.1 to receive a patch. No known workarounds are available.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Expressjs

Products

Multer

CVE-2026-26998

Traefik: unbounded io.ReadAll on auth server response body causes OOM denial of service(DOS)

Traefik is an HTTP reverse proxy and load balancer. Prior to versions 2.11.38 and 3.6.9, there is a potential vulnerability in Traefik managing the ForwardAuth middleware responses. When Traefik is configured to use the ForwardAuth middleware, the response body from the authentication server is read entirely into memory without any size limit. There is no maxResponseBodySize configuration to restrict the amount of data read from the authentication server response. If the authentication server returns an unexpectedly large or unbounded response body, Traefik will allocate unlimited memory, potentially causing an out-of-memory (OOM) condition that crashes the process. This results in a denial of service for all routes served by the affected Traefik instance. This issue has been patched in versions 2.11.38 and 3.6.9.

CVSS 3.1 · 4.4 Medium EPSS < 1% KEV · Not listed

Vendors

Traefik

Products

Traefik

CVE-2026-28452

OpenClaw < 2026.2.14 - Denial of Service via Unguarded Archive Extraction in extractArchive

OpenClaw versions prior to 2026.2.14 contain a denial of service vulnerability in the extractArchive function within src/infra/archive.ts that allows attackers to consume excessive CPU, memory, and disk resources through high-expansion ZIP and TAR archives. Remote attackers can trigger resource exhaustion by providing maliciously crafted archive files during install or update operations, causing service degradation or system unavailability.

CVSS 4.0 · 6.7 Medium EPSS < 1% KEV · Not listed

Vendors

Openclaw

Products

Openclaw

CVE-2026-28478

OpenClaw < 2026.2.13 - Denial of Service via Unbounded Webhook Request Body Buffering

OpenClaw versions prior to 2026.2.13 contain a denial of service vulnerability in webhook handlers that buffer request bodies without strict byte or time limits. Remote unauthenticated attackers can send oversized JSON payloads or slow uploads to webhook endpoints causing memory pressure and availability degradation.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Vendors

Openclaw

Products

Openclaw

CVE-2026-30827

express-rate-limit: IPv4-mapped IPv6 addresses bypass per-client rate limiting (all IPv4 clients share one bucket on dual-stack servers)

express-rate-limit is a basic rate-limiting middleware for Express. In versions starting from 8.0.0 and prior to versions 8.0.2, 8.1.1, 8.2.2, and 8.3.0, the default keyGenerator in express-rate-limit applies IPv6 subnet masking (/56 by default) to all addresses that net.isIPv6() returns true for. This includes IPv4-mapped IPv6 addresses (::ffff:x.x.x.x), which Node.js returns as request.ip on dual-stack servers. Because the first 80 bits of all IPv4-mapped addresses are zero, a /56 (or any /32 to /80) subnet mask produces the same network key (::/56) for every IPv4 client. This collapses all IPv4 traffic into a single rate-limit bucket: one client exhausting the limit causes HTTP 429 for all other IPv4 clients. This issue has been patched in versions 8.0.2, 8.1.1, 8.2.2, and 8.3.0.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Express-rate-limit Express-rate-limit Project

Products

Express-rate-limit Express-rate-limit

CVE-2026-5439

Memory Exhaustion via Forged ZIP Metadata

A memory exhaustion vulnerability exists in ZIP archive processing. Orthanc automatically extracts ZIP archives uploaded to certain endpoints and trusts metadata fields describing the uncompressed size of archived files. An attacker can craft a small ZIP archive containing a forged size value, causing the server to allocate extremely large buffers during extraction.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Orthanc Orthanc-server

Products

Dicom Server Orthanc

CVE-2026-32288

Unbounded allocation for old GNU sparse in archive/tar

tar.Reader can allocate an unbounded amount of memory when reading a maliciously-crafted archive containing a large number of sparse regions encoded in the "old GNU sparse map" format.

CVSS 3.1 · 5.5 Medium EPSS < 1% KEV · Not listed

Vendors

Go Standard Library Golang

Products

Archive/tar Go

CVE-2026-34826

Rack: Unbounded Range Count in get_byte_ranges Enables DoS

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Utils.get_byte_ranges parses the HTTP Range header without limiting the number of individual byte ranges. Although the existing fix for CVE-2024-26141 rejects ranges whose total byte coverage exceeds the file size, it does not restrict the count of ranges. An attacker can supply many small overlapping ranges such as 0-0,0-0,0-0,... to trigger disproportionate CPU, memory, I/O, and bandwidth consumption per request. This results in a denial of service condition in Rack file-serving paths that process multipart byte range responses. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.

CVSS 3.1 · 5.3 Medium EPSS < 1% KEV · Not listed

Vendors

Rack

Products

Rack

CVE-2026-34829

Rack: Denial of Service via Unbounded Multipart File Upload Without Content-Length

Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Multipart::Parser only wraps the request body in a BoundedIO when CONTENT_LENGTH is present. When a multipart/form-data request is sent without a Content-Length header, such as with HTTP chunked transfer encoding, multipart parsing continues until end-of-stream with no total size limit. For file parts, the uploaded body is written directly to a temporary file on disk rather than being constrained by the buffered in-memory upload limit. An unauthenticated attacker can therefore stream an arbitrarily large multipart file upload and consume unbounded disk space. This results in a denial of service condition for Rack applications that accept multipart form data. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Rack

Products

Rack

CVE-2026-25985

Memory allocation with excessive without limits in the internal SVG decoder

ImageMagick is free and open-source software used for editing and manipulating digital images. Prior to versions 7.1.2-15 and 6.9.13-40, a crafted SVG file containing an malicious element causes ImageMagick to attempt to allocate ~674 GB of memory, leading to an out-of-memory abort. Versions 7.1.2-15 and 6.9.13-40 contain a patch.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Imagemagick

Products

Imagemagick

CVE-2026-27204

Wasmtime WASI implementations are vulnerable to guest-controlled resource exhaustion

Wasmtime is a runtime for WebAssembly. Prior to versions 24.0.6, 36.0.6, 4.0.04, 41.0.4, and 42.0.0, Wasmtime's implementation of WASI host interfaces are susceptible to guest-controlled resource exhaustion on the host. Wasmtime did not appropriately place limits on resource allocations requested by the guests. This serves as a Denial of Service vector. Wasmtime 24.0.6, 36.0.6, 40.0.4, 41.0.4, and 42.0.0 have all been released with the fix for this issue. These versions do not prevent this issue in their default configuration to avoid breaking preexisting behaviors. All versions of Wasmtime have appropriate knobs to prevent this behavior, and Wasmtime 42.0.0-and-later will have these knobs tuned by default to prevent this issue from happening. There are no known workarounds for this issue without upgrading. Embedders are recommended to upgrade and configure their embeddings as necessary to prevent possibly-malicious guests from triggering this issue.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed

Vendors

Bytecodealliance

Products

Wasmtime

CVE-2026-25673

Potential denial-of-service vulnerability in URLField via Unicode normalization on Windows

An issue was discovered in 6.0 before 6.0.3, 5.2 before 5.2.12, and 4.2 before 4.2.29. `URLField.to_python()` in Django calls `urllib.parse.urlsplit()`, which performs NFKC normalization on Windows that is disproportionately slow for certain Unicode characters, allowing a remote attacker to cause denial of service via large URL inputs containing these characters. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Seokchan Yoon for reporting this issue.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed

Vendors

Djangoproject

Products

Django