CVE-2016-6581
CVE-2016-6581
This page contains facts from public vulnerability sources. Check the original advisory before updating.
A HTTP/2 implementation built using any version of the Python HPACK library between v1.0.0 and v2.2.0 could be targeted for a denial of service attack, specifically a so-called "HPACK Bomb" attack. This attack occurs when an attacker inserts a header field that is exactly the size of the HPACK dynamic header table into the dynamic header table. The attacker can then send a header block that is simply repeated requests to expand that field in the dynamic table. This can lead to a gigantic compression ratio of 4,096 or better, meaning that 16kB of data can decompress to 64MB of data on the target machine.
CVSS 8.7 · High · EPSS 1.9% · Fix available
- Published
- Updated
Affected products and versions
n/a
- Versions
- n/a: Affected
No fix published
python-hpack Debian:12
- Affected ranges
- ECOSYSTEM: < 2.3.0-1
Update to 2.3.0-1
python-hpack Debian:13
- Affected ranges
- ECOSYSTEM: < 2.3.0-1
Update to 2.3.0-1
python-hpack Debian:14
- Affected ranges
- ECOSYSTEM: < 2.3.0-1
Update to 2.3.0-1
hpack PyPI
- Versions
- 1.0.0
- 1.0.1
- 1.1.0
- 2.0.0
- 2.0.1
- 2.1.0
- 2.1.1
- 2.2.0
- Affected ranges
- ECOSYSTEM: ≥ 1.0.0, < 2.3.0
Update to 2.3.0
hpack PyPI
- Versions
- 1.0.0
- 1.0.1
- 1.1.0
- 2.0.0
- 2.0.1
- 2.1.0
- 2.1.1
- 2.2.0
- Affected ranges
- ECOSYSTEM: < 2.3.0
Update to 2.3.0
python-hpack Ubuntu:16.04:LTS
- Versions
- 1.1.0-1
- 2.0.1-1
- 2.1.0-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published