Vulnerability · Published Oct 20, 2026 · Assigned by GitHub_M

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

Medium 5.6

In plain English

A medium-severity security flaw in ognl from orphan-oss. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 34% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.6Medium

Exploit odds (30 days)0.4%top 66.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	ognl	no fix listed	DEBIAN-CVE-2026-113730
Debian:13	ognl	no fix listed	DEBIAN-CVE-2026-113730
Debian:14	ognl	no fix listed	DEBIAN-CVE-2026-113730
Maven	ognl:ognl	3.4.13	GHSA-crwc-vw2r-qr6m
Ubuntu:22.04:LTS	ognl	no fix listed	UBUNTU-CVE-2026-113730
Ubuntu:24.04:LTS	ognl	no fix listed	UBUNTU-CVE-2026-113730
Ubuntu:26.04:LTS	ognl	no fix listed	UBUNTU-CVE-2026-113730
Ubuntu:26.10	ognl	no fix listed	UBUNTU-CVE-2026-113730

Affected products (as reported)

Vendor	Product	Versions
orphan-oss	ognl	< 3.4.13

Weakness: CWE-693 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

References

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