denial-of-service
Safeguard articles tagged "denial-of-service" — guides, analysis, and best practices for software supply chain and application security.
69 articles
ReDoS: Regular Expression Denial of Service in JavaScript
A single bad regex can freeze your entire Node.js event loop on one malicious request. Here is how catastrophic backtracking works, how to spot vulnerable patterns, and how to fix them without rewriting everything.
HTTP/2 CONTINUATION Flood: Inside CVE-2024-27316 and the Frame-Based DoS Class
A single TCP connection with no END_HEADERS flag was enough to crash major HTTP/2 servers — worse than Rapid Reset, and it took the industry a decade to check for it.
The security cost of long-lived HTTP connections
Keep-alive and HTTP/2 multiplexing cut handshake overhead but hold server resources open per connection — Slowloris and 2023's Rapid Reset attacks both exploited exactly that tradeoff.
ReDoS in Python and FastAPI: how one regex takes down an event loop
CVE-2024-3772 let a single crafted email string trigger catastrophic backtracking in Pydantic's own validator — the exact code path every FastAPI request body runs through.
What is ReDoS (Regular Expression Denial of Service)?
A single badly written regular expression can freeze an entire service under a short, crafted input. This is ReDoS — and it has taken down Cloudflare and Stack Overflow. Here's how to avoid it.
image-size npm Package: Vulnerability History and Safe Usage
The image-size npm package has shipped several infinite-loop denial-of-service bugs in 2025. Here is what happened, which versions are affected, and how to use it safely.
HTTP/2 Rapid Reset (CVE-2023-44487) Explained
A protocol-level flaw in HTTP/2 turned a normal feature into the largest DDoS attacks ever recorded. Here is how Rapid Reset works and which library versions fix it.
CVE-2022-24999: Prototype pollution / DoS in qs querystri...
CVE-2022-24999 exposes a prototype pollution and denial-of-service flaw in the qs querystring library used across the Node.js ecosystem.
CVE-2023-49083: NULL pointer dereference in python-crypto...
A NULL pointer dereference in python-cryptography's PKCS7 loader (CVE-2023-49083) lets malformed input crash applications. Here's what to patch and why.
CVE-2019-1010083: Denial of service in Flask via large mu...
CVE-2019-1010083 let attackers crash Flask apps with crafted multipart requests. Here's the impact, affected versions, and how to remediate the DoS flaw.
CVE-2023-25577: Denial of service in Werkzeug multipart p...
CVE-2023-25577 lets attackers trigger denial of service in Werkzeug's multipart parser via crafted uploads. Here's the impact, timeline, and fix.
CVE-2020-10109: Denial of service in Twisted via 100-cont...
CVE-2020-10109 lets attackers hang Twisted's HTTP server with malformed 100-continue requests, exhausting resources until it stops responding.
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