What is CVE-2018-25026?

CVE-2018-25026 is a critical-severity vulnerability in Actix Actix-Web, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-12-27.

How severe is CVE-2018-25026?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Actix Actix-Web

CVE-2018-25026

An issue was discovered in the actix-web crate before 0.7.15 for Rust. It can add the Send marker trait to an object that cannot be sent between threads safely, leading to memory corruption.

Vulnerability class: Buffer Overflow

Published 2021-12-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.013 (69.8th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 70th percentile — 69.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Actix Actix-Web

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

rustsec.org/advisories/RUSTSEC-2018-0019.html (Third Party Advisory, Issue Tracking)
raw.githubusercontent.com/rustsec/advisory-db/main/crates/actix-web/RUSTSEC-201… (Third Party Advisory)

Frequently asked questions

What is CVE-2018-25026?: CVE-2018-25026 is a critical-severity vulnerability in Actix Actix-Web, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-12-27.
How severe is CVE-2018-25026?: Critical severity. CVSS v3 base score is 9.8 out of 10.