CVE-2025-6176
A public proof of concept exists; no exploitation attested.
- Published2025-10-31
- Fixed in1.2.0
- WeaknessCWE-400
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
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.
Timeline
dates in UTC- 2025-10-3100:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-28 09:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2025-6176?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2025-6176?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 1.2 | < 1.2.0 | 1.2.0 | OSV |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 2.13 | < 2.13.4 | 2.13.4 | OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- brotliAlmaLinux:10all versions · fixed in 1.1.0-7.el10_1and 3 other packages
- brotliAlmaLinux:9all versions · fixed in 1.0.9-9.el9_7and 3 other packages
- brotliAlmaLinux:8all versions · fixed in 1.0.6-4.el8_10and 2 other packages
Vendor advisories
Red Hat Security Advisory: Satellite 6.16.7 Async Update
Red Hat Security Advisory: Satellite 6.17.7 Async Update
Red Hat Security Advisory: OpenShift Container Platform 4.12.86 bug fix and security update
Red Hat Security Advisory: OpenShift Container Platform 4.13.64 bug fix and security update
Red Hat Security Advisory: OpenShift Container Platform 4.14.62 bug fix and security update
Red Hat Security Advisory: New container image: rhceph-9.0
2 more advisories
Fix
- Update brotli to 1.2.0
- Vendor fix Red Hat Product Security RHSA-2026:5971 · 16 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
- Vendor fix Red Hat Product Security RHSA-2026:5970 · 87 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For detailed instructions how to apply this update, refer to: https://docs.redhat.com/en/documentation/red_hat_satellite/6.17/html/updating_red_hat_satellite/index
- Vendor fix Red Hat Product Security RHSA-2026:3861 · 1 productFor OpenShift Container Platform 4.12 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.…
- Vendor fix Red Hat Product Security RHSA-2026:3415 · 1 productFor OpenShift Container Platform 4.13 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.…
- Vendor fix Red Hat Product Security RHSA-2026:2974 · 4 productsFor OpenShift Container Platform 4.14 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.…
- Vendor fix Red Hat Product Security RHSA-2026:3406 · 4 productsThe container images provided by this update can be downloaded from the Red Hat container registry at registry.redhat.io using the "podman pull" command.
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2025-10-31
- Last Modified
- 2026-06-17
- NVD status
- Deferred
Frequently asked questions
What is CVE-2025-6176?
Is CVE-2025-6176 actively exploited?
What is the CVSS score for CVE-2025-6176?
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Go further
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.