CVE-2020-35884 json
HTTP Request smuggling in tiny_http
published 2020-06-16 6 y ago modified 2026-06-17 4 mo ago also GHSA-7v2r-wxmg-mgvc , RUSTSEC-2020-0031 , EUVD-2021-1626
- cvss
- 6.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 65%
- public exploits
- 0
- none known
Summary
An issue was discovered in the tiny_http crate through 2020-06-16 for Rust. HTTP Request smuggling can occur via a malformed Transfer-Encoding header.
Patch / fix
- crates.io tiny_http 0.6.3, 0.8.0
- github.com/tiny-http/tiny-http@623b873 commit
- github.com/tiny-http/tiny-http#190 pull request
Exploit prediction
1.09% chance of exploitation in the next 30 days, higher than 65% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
| NVD | 2.0 | 6.4 | AV:N/AC:L/Au:N/C:P/I:P/A:N |
| OSV | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
| GitHub | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| crates.io | tiny_http | <0.8.0 >=0.0.0-0, <0.6.3 >=0.7.0-0, <0.8.0 |
0.8.0 0.6.3 |
Classification
- Weakness
-
- CWE-444 Inconsistent Interpretation of HTTP Requests
References
-
github.com
/tiny-http/tiny-http/pull/190
web
-
github.com
/tiny-http/tiny-http/commit/623b87397a569729c4bcabae747823c5668cce94
web
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/VO6SRTCEPEYO2OX647I3H5XUWLFDRDWL/
vendor-advisory
-
lists.fedoraproject.org
/archives/list/package-announce%40lists.fedoraproject.org/message/M3JDNRE5RXJOWZZZF5QSCG4GUCSLTHF2/
vendor-advisory
-
rustsec.org
/advisories/RUSTSEC-2020-0031.html
web, third-party-advisory, advisory
-
nvd.nist.gov
/vuln/detail/CVE-2020-35884
advisory
-
github.com
/tiny-http/tiny-http/issues/173
web, report
-
github.com
/tiny-http/tiny-http
package
-
lists.fedoraproject.org
/archives/list/package-announce@lists.fedoraproject.org/message/M3JDNRE5RXJOWZZZF5QSCG4GUCSLTHF2
web
-
lists.fedoraproject.org
/archives/list/package-announce@lists.fedoraproject.org/message/VO6SRTCEPEYO2OX647I3H5XUWLFDRDWL
web
-
crates.io
/crates/tiny_http
package
Sources
- CVE List CVE-2020-35884
- GitHub Advisory GHSA-7v2r-wxmg-mgvc
- NVD CVE-2020-35884
- OSV RUSTSEC-2020-0031
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.