- Exploited
- No known exploitation
- Fix
- Fixed in 3.20.2
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 3.20.2.
- Last modified
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 10/100 · provisional
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
The actix-http library is affected by a request smuggling flaw in its HTTP/1 chunked decoder, which accepts a malformed bare line feed after the final chunk as the start of a trailer. An attacker can exploit the parsing difference, when an upstream proxy reuses connections, to sneak requests past access controls enforced by a proxy or web application firewall.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
The HTTP/1 chunked decoder accepts a bare line feed after the final chunk as the start of a trailer instead of rejecting the malformed request.
When an upstream proxy reuses a connection and either pipelines the requests or does not take steps to validate the chunked stream, the decoder can consume the next request's headers as trailer data. It can then parse that request's body as a new request. An attacker can use this difference in request parsing to bypass access controls enforced by a proxy or web application firewall.
Upgrade to actix-http 3.20.2 or later.
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure?/25Unknown. No advisory context yet
- Reach10/20Affects crates.io packages
- Severity?/10Unknown. No CVSS score or vendor rating
- No patch0/5No signal
What would change the score
- Would score about 65 if added to CISA KEV
- Would score about 60 if CISA's SSVC rates exploitation active
- Would score about 32 if advisories confirm default setups are exposed
What to do
Upgrade to a fixed version: 3.20.2.
Timeline
- Advisory published
- Record last updated
- First seen by cve.now
Affected versions
- actix-httpcrates.io
From 0.0.0-0 · fixed in 3.20.2
Evidence 3
- Advisory
- Repository
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about RUSTSEC-2026-0446
Is RUSTSEC-2026-0446 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
Which versions are affected by RUSTSEC-2026-0446?
actix-http (crates.io): from 0.0.0-0 before 3.20.2.Source: cve.now feed data
How do I fix RUSTSEC-2026-0446?
Upgrade to a fixed version: 3.20.2.Source: cve.now feed data