Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Apereo CAS versions up to 5.2.6, specifically the org.apereo.cas:cas-server-core-configuration-metadata-repository package, are affected by an inefficient regular expression complexity issue. A remote attacker can trigger it by supplying a crafted Name argument, which can cause excessive resource use. The source gives few details, and no fixed version is listed.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 5.3 | Medium | 4.0 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | CNA (VulDB) |
- CISA KEV Not listed.
- EPSS 0.0065, the 51st percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:11 UTC First seen by agentprime
- 31 Oct 2026, 15:11 UTC Confirmed by OSV