CVE-2026-113730

OGNL stricter-invocation block list bypass via java.lang.reflect reflection proxies

OGNL is an Object Graph Navigation Library for Java. Prior to 3.4.13, the optional stricter-invocation mode in OgnlRuntime.invokeMethod checks the declaring class of the method that OGNL invokes but does not block java.lang.reflect.Method, java.lang.reflect.Constructor, or java.lang.reflect.Field. An attacker-controlled expression can invoke one of these reflection objects as a proxy for a method on a blocked class, causing the real operation to execute inside JDK reflection without passing through the stricter-invocation check again. Exploitation requires an application to evaluate untrusted OGNL expressions, use the default or an equivalently permissive MemberAccess that permits reflection, and rely on stricter invocation as a sandbox. Applications using a restrictive MemberAccess, including Apache Struts with SecurityMemberAccess, are not affected by this bypass. This issue is fixed in 3.4.13.

Affected

orphan-oss · ognl

CVSS v3.1 GITHUB

5.6 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

EPSS

0.39% chance of exploitation in the next 30 days, 34th percentile

Published

2026-10-20

Updated

2026-10-21

Proof-of-concept exploits (1)

• advisories/GHSA-crwc-vw2r-qr6mfind archive

CVE references

• orphan-oss/ognl/commit/16396fa4b560221294c2ab9ca04b76b161115e7dREFERENCE
• orphan-oss/ognl/commit/f4c17f794754d516ea799c36ed8524d1b7fb98e2REFERENCE
• orphan-oss/ognl/releases/tag/OGNL_3_4_13REFERENCE
• orphan-oss/ognl/security/advisories/GHSA-crwc-vw2r-qr6mREFERENCE

References

• CVE Record
• NVD entry