CVE-2018-25026 — Actix-Web
CRITICALCVE-2018-25026 is a critical-severity (CVSS 9.8) Out-of-bounds Write vulnerability in actix actix-web. A fix is available — see the affected versions and patch details below.
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.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2018-25026 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 385,386 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Description
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.
Affected Products
actix-webactixDetection & mitigation playbook
Vendor / applianceDetect
Inventory every actix actix-web deployment and check each version against the affected-products list above.
Fix
Apply the actix actix-web security patch or hotfix for CVE-2018-25026 on the affected version, following the vendor advisory for your exact build.
Workarounds
Constrain what reaches the vulnerable code: limit the size and shape of untrusted input, isolate the affected component in a sandboxed or least-privileged process, and enable the platform's memory-safety mitigations (ASLR, stack protector, hardened allocator) so an out-of-bounds access is more likely to fail closed than to be exploitable. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.
Frequently Asked Questions
Is CVE-2018-25026 being exploited in your environment?
Detect and block the exploit chain at execution, on systems you cannot patch yet.