CVE-2026-44432
CVE-2026-44432 · urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API
This page contains facts from public vulnerability sources. Check the original advisory before updating.
This page shows selected source facts. See the linked advisories for the complete description and affected versions.
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.
CVSS 8.9 · High · EPSS 0.9% · Fix available
- Published
- Updated
Affected products and versions
urllib3
- Versions
- >= 2.6.0, < 2.7.0: Affected
No fix published
python-urllib3 Debian:14
- Versions
- 2.3.0-3
- 2.5.0-1
- 2.5.0-1.1
- 2.5.0-2
- 2.6.3-1
- 2.6.3-2
- Affected ranges
- ECOSYSTEM: < 2.7.0-1
Update to 2.7.0-1
urllib3 PyPI
- Versions
- 2.6.0
- 2.6.1
- 2.6.2
- 2.6.3
- Affected ranges
- ECOSYSTEM: ≥ 2.6.0, < 2.7.0
Update to 2.7.0
python-pip Ubuntu:Pro:14.04:LTS
- Versions
- 1.4.1-2
- 1.5.4-1
- 1.5.4-1ubuntu1
- 1.5.4-1ubuntu3
- 1.5.4-1ubuntu4
- 1.5.4-1ubuntu4+esm1
- 1.5.4-1ubuntu4+esm2
- 1.5.4-1ubuntu4+esm3
- 1.5.4-1ubuntu4+esm4
- 1.5.4-1ubuntu4+esm5
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-pip Ubuntu:Pro:16.04:LTS
- Versions
- 1.5.6-7ubuntu1
- 1.5.6-7ubuntu2
- 8.0.2-7
- 8.0.3-1
- 8.0.3-2
- 8.1.0-1
- 8.1.0-2
- 8.1.1-1
- 8.1.1-2
- 8.1.1-2ubuntu0.1
- 8.1.1-2ubuntu0.2
- 8.1.1-2ubuntu0.4
- 8.1.1-2ubuntu0.6
- 8.1.1-2ubuntu0.6+esm2
- 8.1.1-2ubuntu0.6+esm3
- 8.1.1-2ubuntu0.6+esm4
- 8.1.1-2ubuntu0.6+esm5
- 8.1.1-2ubuntu0.6+esm6
- 8.1.1-2ubuntu0.6+esm8
- 8.1.1-2ubuntu0.6+esm10
- 8.1.1-2ubuntu0.6+esm11
- 8.1.1-2ubuntu0.6+esm12
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-pip Ubuntu:Pro:18.04:LTS
- Versions
- 9.0.1-2
- 9.0.1-2.3~ubuntu1
- 9.0.1-2.3~ubuntu1.18.04.1
- 9.0.1-2.3~ubuntu1.18.04.2
- 9.0.1-2.3~ubuntu1.18.04.3
- 9.0.1-2.3~ubuntu1.18.04.4
- 9.0.1-2.3~ubuntu1.18.04.5
- 9.0.1-2.3~ubuntu1.18.04.5+esm2
- 9.0.1-2.3~ubuntu1.18.04.5+esm3
- 9.0.1-2.3~ubuntu1.18.04.6
- 9.0.1-2.3~ubuntu1.18.04.6+esm1
- 9.0.1-2.3~ubuntu1.18.04.7
- 9.0.1-2.3~ubuntu1.18.04.7+esm1
- 9.0.1-2.3~ubuntu1.18.04.8
- 9.0.1-2.3~ubuntu1.18.04.8+esm1
- 9.0.1-2.3~ubuntu1.18.04.8+esm2
- 9.0.1-2.3~ubuntu1.18.04.8+esm4
- 9.0.1-2.3~ubuntu1.18.04.8+esm6
- 9.0.1-2.3~ubuntu1.18.04.8+esm7
- 9.0.1-2.3~ubuntu1.18.04.8+esm8
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-pip Ubuntu:Pro:20.04:LTS
- Versions
- 18.1-5
- 18.1-5build1
- 18.1-5ubuntu1
- 20.0.2-2
- 20.0.2-4
- 20.0.2-5
- 20.0.2-5ubuntu1
- 20.0.2-5ubuntu1.1
- 20.0.2-5ubuntu1.3
- 20.0.2-5ubuntu1.4
- 20.0.2-5ubuntu1.5
- 20.0.2-5ubuntu1.6
- 20.0.2-5ubuntu1.7
- 20.0.2-5ubuntu1.8
- 20.0.2-5ubuntu1.9
- 20.0.2-5ubuntu1.10
- 20.0.2-5ubuntu1.10+esm2
- 20.0.2-5ubuntu1.11
- 20.0.2-5ubuntu1.11+esm2
- 20.0.2-5ubuntu1.11+esm3
- 20.0.2-5ubuntu1.11+esm4
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-pip Ubuntu:Pro:22.04:LTS
- Versions
- 20.3.4-4
- 21.3.1+dfsg-3
- 22.0.2+dfsg-1
- 22.0.2+dfsg-1ubuntu0.1
- 22.0.2+dfsg-1ubuntu0.2
- 22.0.2+dfsg-1ubuntu0.3
- 22.0.2+dfsg-1ubuntu0.4
- 22.0.2+dfsg-1ubuntu0.5
- 22.0.2+dfsg-1ubuntu0.6
- 22.0.2+dfsg-1ubuntu0.7
- 22.0.2+dfsg-1ubuntu0.7+esm1
- 22.0.2+dfsg-1ubuntu0.7+esm2
- 22.0.2+dfsg-1ubuntu0.7+esm3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-pip Ubuntu:Pro:24.04:LTS
- Versions
- 23.2+dfsg-1
- 23.3+dfsg-1
- 24.0+dfsg-1
- 24.0+dfsg-1ubuntu1
- 24.0+dfsg-1ubuntu1.1
- 24.0+dfsg-1ubuntu1.2
- 24.0+dfsg-1ubuntu1.3
- 24.0+dfsg-1ubuntu1.3+esm1
- 24.0+dfsg-1ubuntu1.3+esm2
- 24.0+dfsg-1ubuntu1.3+esm3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-pip Ubuntu:25.10
- Versions
- 25.0+dfsg-1
- 25.1.1+dfsg-1
- 25.1.1+dfsg-1ubuntu1
- 25.1.1+dfsg-1ubuntu2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-pip Ubuntu:26.10
- Versions
- 25.1.1+dfsg-1ubuntu2
- 26.1.2+dfsg-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
python-urllib3 Ubuntu:26.04:LTS
- Versions
- 2.3.0-3
- 2.5.0-1
- 2.5.0-1ubuntu1
- 2.5.0-1ubuntu2
- 2.6.3-1ubuntu1
- Affected ranges
- ECOSYSTEM: < 2.6.3-1ubuntu1.1
Update to 2.6.3-1ubuntu1.1
python-pip Ubuntu:Pro:26.04:LTS
- Versions
- 25.1.1+dfsg-1ubuntu2
- 25.1.1+dfsg-1ubuntu2+esm1
- 25.1.1+dfsg-1ubuntu2+esm2
- 25.1.1+dfsg-1ubuntu2+esm3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
Original sources
- https://github.com/urllib3/urllib3/security/advisories/GHSA-mf9v-mfxr-j63j
- https://access.redhat.com/security/cve/CVE-2026-44432
- https://bugzilla.redhat.com/show_bug.cgi?id=2477154
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-44432.json
- https://access.redhat.com/errata/RHSA-2026:42078
- https://access.redhat.com/errata/RHSA-2026:34160
- https://access.redhat.com/errata/RHSA-2026:42079
- https://access.redhat.com/errata/RHSA-2026:27929
- https://access.redhat.com/errata/RHSA-2026:32992
- https://access.redhat.com/errata/RHSA-2026:28159
- https://access.redhat.com/errata/RHSA-2026:28157
- https://access.redhat.com/errata/RHSA-2026:28000
- https://access.redhat.com/errata/RHSA-2026:60362
- https://access.redhat.com/errata/RHSA-2026:60371
- https://access.redhat.com/errata/RHSA-2026:59409
- https://access.redhat.com/errata/RHSA-2026:28158
- https://access.redhat.com/errata/RHSA-2026:30078
- https://access.redhat.com/errata/RHSA-2026:30089
- https://access.redhat.com/errata/RHSA-2026:30088
- https://access.redhat.com/errata/RHSA-2026:30087
- https://access.redhat.com/errata/RHSA-2026:24542
- https://access.redhat.com/errata/RHSA-2026:24540
- https://access.redhat.com/errata/RHSA-2026:24544
- https://nvd.nist.gov/vuln/detail/CVE-2026-44432