Vulnerability advisory
EEF-CVE-2026-77831
Algorithmic-complexity denial of service in AshPaperTrail full-diff list tracking
Also known as CVE-2026-77831GHSA-7c66-59m8-723c
- CVSS 4.0
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Affected versions
| Affected | Fixed in |
|---|---|
0.1.1 to before 0.7.0 | 0.7.0Advisories → |
Repository
| Affected commits | Fixed by commit |
|---|---|
| GIT github.com/ash-project/ash_paper_trail ↗ | |
| 449cd2a93416853066378fa61c715e89f80dc854 to before e781f5d8840b07d57db99f9a4728298837d7b3a8 | e781f5d8840b07d57db99f9a4728298837d7b3a8 |
Also listed as affected (17)
| |
Description
Summary
Inefficient Algorithmic Complexity vulnerability in ash-project ash_paper_trail allows a user who can submit a large array attribute to a paper-trailed create or update action to cause a denial of service through excessive CPU and memory use.
With full-diff change tracking, AshPaperTrail.ChangeBuilders.FullDiff.ListChange pairs each prior array element against the new list by rebuilding the remaining-elements accumulator with acc ++ [tuple] on every step, copying the growing list each time, so the pairing scales cubically in the array length. Nothing bounds the length and the value comes straight from action input, so one request carrying a large accepted {:array, _} attribute forces tens of seconds of CPU and multi-gigabyte allocations.
This issue affects ash_paper_trail: from 0.1.1 before 0.7.0.
Configurations
The resource must use full-diff change tracking (change_tracking_mode :full_diff) and accept an array attribute with no effective maximum length, reached through a create or update action exposed to the input.