CVE-2020-7658
meinheld vulnerable to HTTP Request Smuggling
meinheld prior to 1.0.2 is vulnerable to HTTP Request Smuggling. HTTP pipelining issues and request smuggling attacks might be possible due to incorrect Content-Length and Transfer encoding header parsing.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
meinheld prior to 1.0.2 is vulnerable to HTTP Request Smuggling. HTTP pipelining issues and request smuggling attacks might be possible due to incorrect Content-Length and Transfer encoding header parsing.
- Record
CVE-2020-7658- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-444
- Updated
- 2026-11-02
CVE List No score
meinheld prior to 1.0.2 is vulnerable to HTTP Request Smuggling. HTTP pipelining issues and request smuggling attacks might be possible due to incorrect Content-Length and Transfer encoding header parsing.
- Record
CVE-2020-7658- Updated
- 2026-11-02
EUVDEUVD-2020-0109 No score
meinheld prior to 1.0.2 is vulnerable to HTTP Request Smuggling. HTTP pipelining issues and request smuggling attacks might be possible due to incorrect Content-Length and Transfer encoding header parsing.
- Record
EUVD-2020-0109- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-63h2-9cc8-fc7m
meinheld vulnerable to HTTP Request Smuggling
meinheld prior to 1.0.2 is vulnerable to HTTP Request Smuggling. HTTP pipelining issues and request smuggling attacks might be possible due to incorrect Content-Length and Transfer encoding header parsing.
- Record
GHSA-63h2-9cc8-fc7m- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-444
- Updated
- 2026-11-02
OSV
meinheld prior to 1.0.2 is vulnerable to HTTP Request Smuggling. HTTP pipelining issues and request smuggling attacks might be possible due to incorrect Content-Length and Transfer encoding header parsing.
- Record
CVE-2020-7658- CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVGHSA-63h2-9cc8-fc7m
meinheld vulnerable to HTTP Request Smuggling
meinheld prior to 1.0.2 is vulnerable to HTTP Request Smuggling. HTTP pipelining issues and request smuggling attacks might be possible due to incorrect Content-Length and Transfer encoding header parsing.
- Record
GHSA-63h2-9cc8-fc7m- CVSS 4.0
- 5.3 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N - CVSS 3.1
- 6.1 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-444
- Updated
- 2026-11-02
OSVPYSEC-2020-239 No score
meinheld prior to 1.0.2 is vulnerable to HTTP Request Smuggling. HTTP pipelining issues and request smuggling attacks might be possible due to incorrect Content-Length and Transfer encoding header parsing.
- Record
PYSEC-2020-239- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
meinheldPyPI |
before 1.0.2 | 1.0.2 |
meinheldPyPI |
before 1.0.2, plus listed versions 0.10.1.10.1.20.20.2.1 Show 34 moreShow less0.30.3.10.3.20.3.30.40.4.10.4.100.4.110.4.120.4.130.4.140.4.150.4.20.4.30.4.40.4.50.4.60.4.70.4.80.4.90.50.5.10.5.20.5.30.5.40.5.50.5.60.5.70.5.80.5.90.6.00.6.11.0.01.0.1 |
1.0.2 |
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-7658 is a medium vulnerability (CVSS 6.1) in Meinheld, published May 22, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.69%, the 52nd percentile. Fixed in meinheld 1.0.2.
References
github.com/mopemope/meinheld/blob/master/CHANGES.rst%2C
snyk.io/vuln/SNYK-PYTHON-MEINHELD-569140
nvd.nist.gov/vuln/detail/CVE-2020-7658
Show 6 moreShow less