CVE-2026-16270: ReDoS in Open Mercato

Severity: medium (CVSS 6.9 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-22 · updated 2026-07-22
Weakness: CWE-1333

Description

Open Mercato does not validate regex rules. An attacker with privileges to create the regex rule can add an unsafe regex to a field. When someone provide the proper string it can result in a DoS attack. This issue was fixed in version 0.6.4.

Affected products

Open Mercato: before 0.6.4 — fixed in 0.6.4

How to fix

Upgrade to a fixed version: Open Mercato 0.6.4. Check the vendor advisory for mitigations.

References

https://cert.pl/posts/2026/07/CVE-2026-16270
https://github.com/open-mercato/open-mercato/pull/1996
https://www.openmercato.com/

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