CVE catalog
CVE-2026-44432
urllib3 is an HTTP client library for Python. From 2.6.0 to before 2.7.0, urllib3 could decompress the whole response instead of the requested portion (1) during the second HTTPResponse.read(amt=N) ca
- Severity
- High · CVSS 8.9
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.68% · Oct 25, 2026
urllib3 is an HTTP client library for Python. From 2.6.0 to before 2.7.0, urllib3 could decompress the whole response instead of the requested portion (1) during the second HTTPResponse.read(amt=N) call when the response was decompressed using the official Brotli library or (2) when HTTPResponse.drain_conn() was called after the response had been read and decompressed partially (compression algorithm did not matter here). These issues could cause urllib3 to fully decode a small amount of highly compressed data in a single operation. This could result in excessive resource consumption (high CPU usage and massive memory allocation for the decompressed data) on the client side. This vulnerability is fixed in 2.7.0.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | python-urllib3 | sid | 2.8.0-2 | fixed |
| Debian | python-urllib3 | forky | 2.8.0-2 | fixed |
| Debian | python-urllib3 | trixie | 2.3.0-3+deb13u2 | not affected |
| Debian | python-urllib3 | trixie-security | 2.3.0-3+deb13u2 | not affected |
| Debian | python-urllib3 | bookworm | 1.26.12-1+deb12u4 | not affected |
| Debian | python-urllib3 | bookworm-security | 1.26.12-1+deb12u4 | not affected |
| Cpe | python-urllib3 | Not reported | 2.0.7-1ubuntu0.7 | fixed |
| Cpe | python3-urllib3 | Not reported | 2.0.7-1ubuntu0.7 | fixed |
| Cpe | urllib3 | Not reported | 2.7.0 | fixed |
| PyPI | urllib3 | Not reported | 2.7.0 | fixed |
| Cpe | urllib3 | Not reported | 2.7.0 | fixed |
| Opensuse | python-urllib3 | tumbleweed | 2.7.0-1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-urllib3 | source | sid | 2.7.0-1 | not yet assigned | Not reported | [1136654] |
| Debian | python-urllib3 | source | forky | 2.7.0-1 | not yet assigned | Not reported | [1136654] |
| Debian | python-urllib3 | source | trixie | Not affected | unimportant | Not reported | [1136654] |
| Debian | python-urllib3 | source | bookworm | Not affected | unimportant | Not reported | [1136654] |
| Cpe | python-urllib3 | cpe | Not reported | 2.0.7-1ubuntu0.7 | Not reported | Not reported | Not reported |
| Cpe | python3-urllib3 | cpe | Not reported | 2.0.7-1ubuntu0.7 | Not reported | Not reported | Not reported |
| Cpe | urllib3 | cpe | Not reported | 2.7.0 | Not reported | Not reported | Not reported |
| PyPI | urllib3 | PyPI | Not reported | 2.7.0 | Not reported | GHSA-MF9V-MFXR-J63J | Not reported |
| Cpe | urllib3 | cpe | Not reported | 2.7.0 | Not reported | NVD-CVE-2026-44432 | Not reported |
| Opensuse | python-urllib3 | rpm | tumbleweed | 2.7.0-1.1 | Not reported | OPENSUSE-SU-2026:10798-1 | Not reported |
OpenFactory catalog packages
[openSUSE Tumbleweed]
- [python313-urllib3]Unknown
Source package: [python-urllib3]
Details (1)
2.7.0-2.3· noarch · tumbleweedUnknown · Fixed:
2.7.0-1.1Version impact unknown
nvd · python-urllib3 · opensuse · tumbleweed
- [python314-urllib3]Unknown
Source package: [python-urllib3]
Details (1)
2.7.0-2.3· noarch · tumbleweedUnknown · Fixed:
2.7.0-1.1Version impact unknown
nvd · python-urllib3 · opensuse · tumbleweed
[Debian 12 (Bookworm)]
- [python3-urllib3]Not affected
Source package: [python-urllib3]
Details (4)
1.26.12-1+deb12u4· all · bookwormNot affected
nvd · python-urllib3 · debian · bookworm
1.26.12-1+deb12u4· all · bookwormNot affected
nvd · python-urllib3 · debian · bookworm
1.26.12-1+deb12u4· all · bookworm-securityNot affected
nvd · python-urllib3 · debian · bookworm
1.26.12-1+deb12u4· all · bookworm-securityNot affected
nvd · python-urllib3 · debian · bookworm
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/rhsa-2026_27929.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-44432]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-44432]
- [https://osv.dev/vulnerability/GHSA-mf9v-mfxr-j63j]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10798-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-44432]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44432.json]
- [https://ubuntu.com/security/notices/USN-8379-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-2455.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]