CVE-2020-26281: http-rs async-h1 HTTP Request/Response Smuggling
CVSS: 6.8v3.1MediumModified
AliasesGHSA-4vr9-8cjf-vf9cCVE-2020-36202GHSA-c8rq-crxj-mj9mRUSTSEC-2020-0093
Published 21-12-2020Last modified 04-08-2024
Vulnerability summary
CVE-2020-26281 is a medium (CVSS 6.8) HTTP Request/Response Smuggling vulnerability in http-rs async-h1. EPSS estimates a 1.02% chance of exploitation in the next 30 days, higher than 62.8% of scored vulnerabilities.
CVSS score
6.8/10
010
Medium · v3.1 (CVE.org)EPSS score
1.02%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 21-12-2020PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in the async-h1 crate before 2.3.0 for Rust. Request smuggling can occur when used behind a reverse proxy.
CVSS metrics
4 scores · 3 sources · 2 versionsMedium 6.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:NSources3 sources · 6.1–6.8
- OSV · Crates.ioEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NDiffers
- NVDNIST6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NDiffers
Medium 4.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:N/I:P/A:NSourcesSingle source
EPSS trend
Probability
1.02%
Chance of exploitation in the next 30 days
Percentile
63%
Versus all other CVEs
30-day change
0.00 pp
From 1.02% on 20-09-2026
20-09-202620-10-2026
EPSS score1.02%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-444Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.
- CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
Affected systems
Crates.Io1 product
- async-h1< 2.3.0 | ≥ 0.0.0-0, < 2.3.0
Http-rs1 product
- async-h1< 2.3.0
Rust-lang1 product
- async-h1< 2.3.0
3 vendors · 3 products
References
7 links- github.com/http-rs/async-h1/security/advisories/GHSA-4vr9-8cjf-vf9cX Refsource CONFIRMWEBThird Party Advisory
- github.com/http-rs/async-h1PACKAGE
- crates.io/crates/async-h1PACKAGE