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Vulnerabilities

Vulnerability · RUSTSEC-2026-0455

Large-window Brotli bodies bypass decompression memory limits

Published Nov 6, 2026 · catalog updated Nov 6, 2026 · RustSec Rust

Last checked Nov 7, 2026. A connected source was read within the last 7 days.

Open the advisory

Exploitation likelihood is not on this record for RUSTSEC-2026-0455. A missing EPSS score is not a low risk. Compare RustSec Rust with the linked advisory before you change production.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
  • EPSS is missing. A missing score is not a low risk.

Same product and reporting

Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
Awaiting synchronization with FIRST
Remediation
Advisory link
Affected products
crates.io actix-http

With the feature enabled, the decoder accepts the non-standard large-window Brotli format. A crafted stream can cause its internal buffer to grow to about 1 GiB before the decoded output reaches the configured size limit. An 850-byte request can cause this allocation, and concurrent requests can exhaust process or host memory. Actix Web enables Brotli support by default. Applications that read request bodies through , , , or can be affected even when extractor size limits are configured. The allocation occurs before the handler runs, so authentication performed in the handler does not prevent it. Upgrade to actix-http 3.20.3 or later. As a workaround, reject requests with at a reverse proxy or in middleware before body extraction, or disable the feature throughout the dependency graph.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • crates.io actix-http0.0.0-0 → 3.20.3

How to fix RUSTSEC-2026-0455

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

Exploitation likelihood is not on this record for RUSTSEC-2026-0455. A missing EPSS score is not a low risk. Compare RustSec Rust with the linked advisory before you change production.

Which versions are affected?

Compare what you have installed with 0.0.0-0 → 3.20.3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS is not on this record yet. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Nov 6, 2026 · GitHub Advisory Database

    Detected

    With the feature enabled, the decoder accepts the non-standard large-window Brotli format. A crafted stream can cause its internal buffer to grow to about 1 GiB before the decoded output reaches the configured size limit. An 850-byte request can cause this allocation, and concurrent requests can exhaust process or host memory. Actix Web enables Brotli support by default. Applications that read req

  2. Nov 6, 2026 · GitHub Advisory Database

    Fix available

    actix-http fixed in 3.20.3

  3. Nov 6, 2026 · GitHub Advisory Database

    Fix available

    actix-http fixed in 3.20.3

  4. Nov 6, 2026 · GitHub Advisory Database

    Updated

    With the feature enabled, the decoder accepts the non-standard large-window Brotli format. A crafted stream can cause its internal buffer to grow to about 1 GiB before the decoded output reaches the configured size limit. An 850-byte request can cause this allocation, and concurrent requests can exhaust process or host memory. Actix Web enables Brotli support by default. Applications that read req

Sources

  • GitHub Advisory DatabasePackage advisoryGHSA-7p9w-p5qm-5gc5

    GitHub Advisory Database record mirrored by OSV.

    github.com
  • OpenSSF OSV / OSV ScannerPackage advisoryRUSTSEC-2026-0455

    Large-window Brotli bodies bypass decompression memory limits

    osv.dev
  • RustSec Advisory DBVendor advisoryRUSTSEC-2026-0455

    With the feature enabled, the decoder accepts the non-standard large-window Brotli format. A crafted stream can cause its internal buffer to grow to about 1 GiB before the decoded output reaches the configured size limit. An 850-byte request can cause this allocation, and concurr

    crates.io

References

Freshness

Last verified in this catalog Nov 6, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • GitHub Advisory DatabaseNov 7, 2026
  • OpenSSF OSV / OSV ScannerNov 7, 2026
  • RustSec Advisory DBNov 7, 2026