- Exploited
- No known exploitation
- Fix
- Fixed in 4.18.2
- Who is exposed
- Not reported
Do first: Upgrade to a fixed version: 4.18.2.
- 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
Compressed request bodies handled by the actix-web and actix-http Rust web frameworks can exhaust server memory or CPU before size limits are enforced, causing denial of service. The flaw is reachable remotely by sending a small compressed request body, and it only affects applications that have the matching compression feature enabled.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
Body extractors do not pass their size limits to the decompression layer. A small compressed request can therefore cause a large allocation before the extractor rejects the decoded body. A remote attacker can use this to exhaust memory or CPU resources and cause denial of service.
This affects applications that read compressed request bodies with the corresponding compression feature enabled.
Upgrade to actix-web 4.18.2 or later with actix-http 3.20.1 or later. As a workaround, reject compressed request bodies at a reverse proxy or in middleware before body extraction.
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: 4.18.2.
Timeline
- Advisory published
- Record last updated
- First seen by cve.now
Affected versions
- actix-webcrates.io
From 0.0.0-0 · fixed in 4.18.2
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-2026-0447
Is RUSTSEC-2026-0447 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-2026-0447?
actix-web (crates.io): from 0.0.0-0 before 4.18.2.Source: cve.now feed data
How do I fix RUSTSEC-2026-0447?
Upgrade to a fixed version: 4.18.2.Source: cve.now feed data