CVE-2025-6176

Name	CVE-2025-6176
Description	Scrapy versions up to 2.13.2 are vulnerable to a denial of service (DoS) attack due to a flaw in its brotli decompression implementation. The protection mechanism against decompression bombs fails to mitigate the brotli variant, allowing remote servers to crash clients with less than 80GB of available memory. This occurs because brotli can achieve extremely high compression ratios for zero-filled data, leading to excessive memory consumption during decompression.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
python-scrapy (PTS)	bullseye	2.4.1-2+deb11u1	vulnerable
	bookworm	2.8.0-2	vulnerable
	trixie	2.12.0-2	vulnerable
	forky, sid	2.13.4-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
python-scrapy	source	(unstable)	2.13.4-1	unimportant

Notes

https://huntr.com/bounties/2c26a886-5984-47ee-a421-0d5fe1344eb0
Fixed by: https://github.com/scrapy/scrapy/commit/c44b8df6c7f8a6650c9655e271da2ba3a764fa15 (2.13.4)
Negligible security impact