CVE-2024-39702

Severity: medium (CVSS 5.9 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-07-23 · updated 2026-06-17
Weakness: CWE-407

Description

In lj_str_hash.c in OpenResty 1.19.3.1 through 1.25.3.1, the string hashing function (used during string interning) allows HashDoS (Hash Denial of Service) attacks. An attacker could cause excessive resource usage during proxy operations via crafted requests, potentially leading to a denial of service with relatively few incoming requests. This vulnerability only exists in the OpenResty fork in the openresty/luajit2 GitHub repository. The LuaJIT/LuaJIT repository. is unaffected.

Affected products

openresty: from 1.19.3.1 before 1.19.9.2; from 1.21.4.1 before 1.21.4.4; 1.25.3.1 — fixed in 1.19.9.2, 1.21.4.4

How to fix

Upgrade to a fixed version: openresty 1.19.9.2, 1.21.4.4. Check the vendor advisory for mitigations.

References

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