CVE-2026-128242

HIGH 7.5

actix-http before 3.20.1 and actix-web before 4.18.2 Decompression Bomb DoS via encoding::Decoder

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

actix-http before 3.20.1 and actix-web before 4.18.2 contain an unbounded decompression vulnerability in encoding::Decoder that lets remote attackers exhaust memory and CPU via compressed bodies. Attackers can send small highly compressed gzip, deflate, Brotli or zstd request bodies to Json, Form, Bytes or String extractors, or serve them to awc clients, causing denial of service.

CWE	CWE-409
Vendor	actix
Product	actix-http
Published	Nov 13, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

actix / actix-http

0 < 3.20.1

actix / actix-web

0 < 4.18.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/actix/actix-web/security/advisories/GHSA-qph8-7859-gq2f rustsec.org: https://rustsec.org/advisories/RUSTSEC-2026-0448.html github.com: https://github.com/actix/actix-web/commit/41b54d23ea04f66758c15de7e4ab18325cd25280 github.com: https://github.com/actix/actix-web/commit/0d0be61bd757027bfcecbc53df1b7a600f21ecd0 github.com: https://github.com/actix/actix-web/blob/actix-http-v3.20.0/actix-http/src/encoding/decoder.rs#L239-L301 github.com: https://github.com/actix/actix-web/releases/tag/actix-http-v3.20.1 github.com: https://github.com/actix/actix-web/releases/tag/actix-web-v4.18.2 github.com: https://github.com/actix/actix-web vulncheck.com: https://www.vulncheck.com/advisories/actix-http-before-3.20.1-and-actix-web-before-4.18.2-decompression-bomb-dos-via-encoding-decoder

Credits

Stapat diandiandia lboynton calbebop Rob Ede