Vulnerability · Published Jul 22, 2026 · Assigned by CERT-PL
CVE-2026-16270ReDoS in Open Mercato
Medium 6.9
In plain English
A medium-severity regular-expression denial of service in Open Mercato from Open Mercato. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities).
Severity (CVSS 4.0)6.9Medium
Exploit odds (30 days)0.5%top 58.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Open Mercato | Open Mercato | 0 – before 0.6.4 |
Weakness: CWE-1333 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
- https://cert.pl/posts/2026/07/CVE-2026-16270 third-party-advisory
- https://www.openmercato.com/ product
- https://github.com/open-mercato/open-mercato/pull/1996 patch