What’s Vulnerable › Vulnerabilities

CVE-2026-113730: OGNL stricter-invocation block list bypass via java.lang.reflect reflection proxies

• Severity: medium (CVSS 5.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-20 · updated 2026-10-22
• Weakness: CWE-693

Description

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 products

• orphan-oss ognl: before 3.4.13

References

• https://github.com/orphan-oss/ognl/commit/16396fa4b560221294c2ab9ca04b76b161115e7d
• https://github.com/orphan-oss/ognl/commit/f4c17f794754d516ea799c36ed8524d1b7fb98e2
• https://github.com/orphan-oss/ognl/releases/tag/OGNL_3_4_13
• https://github.com/orphan-oss/ognl/security/advisories/GHSA-crwc-vw2r-qr6m

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