CVE-2025-6176
published 2025-10-31CVE-2025-6176: 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…
PriorityP342high7.5CVSS 3.0
AVNACLPRNUINSUCNINAH
EPSS
0.50%
40.2th percentile
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.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | python-scrapy | < python-scrapy 2.13.4-1 (forky) | python-scrapy 2.13.4-1 (forky) |
| scrapy | scrapy | >= 0 < 2.13.4 | 2.13.4 |
| scrapy | scrapy_scrapy | unspecified – latest | — |
CVSS provenance
nvdv3.07.5HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
osv7.5HIGH
vendor_debian7.5LOW
vendor_redhat7.5HIGH
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OSV
Scrapy is vulnerable to a denial of service (DoS) attack due to flaws in brotli decompression implementation
osv·2025-10-31
CVE-2025-6176 [HIGH] Scrapy is vulnerable to a denial of service (DoS) attack due to flaws in brotli decompression implementation
Scrapy is vulnerable to a denial of service (DoS) attack due to flaws in brotli decompression implementation
Scrapy versions up to 2.13.3 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. Mitigation for this vulnerability needs security enhancement added in brotli v1.2.0.
GHSA
Scrapy is vulnerable to a denial of service (DoS) attack due to flaws in brotli decompression implementation
ghsa·2025-10-31
CVE-2025-6176 [HIGH] CWE-400 Scrapy is vulnerable to a denial of service (DoS) attack due to flaws in brotli decompression implementation
Scrapy is vulnerable to a denial of service (DoS) attack due to flaws in brotli decompression implementation
Scrapy versions up to 2.13.3 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. Mitigation for this vulnerability needs security enhancement added in brotli v1.2.0.
OSV
CVE-2025-6176: Scrapy versions up to 2
osv·2025-10-31·CVSS 7.5
CVE-2025-6176 [HIGH] CVE-2025-6176: Scrapy versions up to 2
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.
Red Hat
Scrapy: python-scrapy: brotli: Python brotli decompression bomb DoS
vendor_redhat·2025-10-31·CVSS 7.5
CVE-2025-6176 [HIGH] CWE-400 Scrapy: python-scrapy: brotli: Python brotli decompression bomb DoS
Scrapy: python-scrapy: brotli: Python brotli decompression bomb DoS
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.
Scrapy 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
Debian
CVE-2025-6176: python-scrapy - Scrapy versions up to 2.13.2 are vulnerable to a denial of service (DoS) attack ...
vendor_debian·2025·CVSS 7.5
CVE-2025-6176 [HIGH] CVE-2025-6176: python-scrapy - Scrapy versions up to 2.13.2 are vulnerable to a denial of service (DoS) attack ...
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.
Scope: local
bookworm: open
bullseye: open
forky: resolved (fixed in 2.13.4-1)
sid: resolved (fixed in 2.13.4-1)
trixie: open
No detection rules found.
Bugzilla
CVE-2025-6176 mingw-brotli: Brotli decompression bomb DoS in scrapy/scrapy [fedora-42]
bugzilla·2025-12-05·CVSS 7.5
CVE-2025-6176 [HIGH] CVE-2025-6176 mingw-brotli: Brotli decompression bomb DoS in scrapy/scrapy [fedora-42]
CVE-2025-6176 mingw-brotli: Brotli decompression bomb DoS in scrapy/scrapy [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
It is Fedora's policy to close all bug r
Bugzilla
CVE-2025-6176 python-scrapy: Brotli decompression bomb DoS in scrapy/scrapy [fedora-43]
bugzilla·2025-11-01·CVSS 7.5
CVE-2025-6176 [HIGH] CVE-2025-6176 python-scrapy: Brotli decompression bomb DoS in scrapy/scrapy [fedora-43]
CVE-2025-6176 python-scrapy: Brotli decompression bomb DoS in scrapy/scrapy [fedora-43]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Discussion:
Updating brotli to 1.2.0 will expose the Python APIs necessary to mitigate this in scrapy. The actual fix will then be updating python-scrapy to 2.13.4, https://docs.scrapy.org/en/latest/news.html#sc
Bugzilla
CVE-2025-6176 python-scrapy: Brotli decompression bomb DoS in scrapy/scrapy [fedora-42]
bugzilla·2025-11-01·CVSS 7.5
CVE-2025-6176 [HIGH] CVE-2025-6176 python-scrapy: Brotli decompression bomb DoS in scrapy/scrapy [fedora-42]
CVE-2025-6176 python-scrapy: Brotli decompression bomb DoS in scrapy/scrapy [fedora-42]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Discussion:
Updating brotli to 1.2.0 will expose the Python APIs necessary to mitigate this in scrapy. The actual fix will then be updating python-scrapy to 2.13.4, https://docs.scrapy.org/en/latest/news.html#sc
Bugzilla
CVE-2025-6176 Scrapy: python-scrapy: brotli: Python brotli decompression bomb DoS
bugzilla·2025-10-31·CVSS 7.5
CVE-2025-6176 [HIGH] CVE-2025-6176 Scrapy: python-scrapy: brotli: Python brotli decompression bomb DoS
CVE-2025-6176 Scrapy: python-scrapy: brotli: Python brotli decompression bomb DoS
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.
Discussion:
This issue has been addressed in the following products:
Red Hat Enterprise Linux 10.0 Extended Update Support
Via RHSA-2026:0008 https://access.redhat.com/errata/RHSA-2026:0008
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This issue has been addressed in the following pr
2025-10-31
Published