# CVE-2026-30873: OpenWrt Project jsonpath: Memory leak when processing strings, labels, and regexp tokens

> A memory leak in OpenWrt's jsonpath parser allows attackers to exhaust system memory, potentially causing denial of service on embedded devices.

- **Severity:** Low 2.4 (`CVSS:4.0/AV:A/AC:L/AT:N/PR:H/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 19 Mar 2026
- **Updated:** 21 Mar 2026
- **Also known as:** GHSA-rcc6-v4r6-gj4m

## What is CVE-2026-30873?

CVE-2026-30873 is a low-severity denial of service vulnerability in Openwrt Openwrt, published on 19 Mar 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

OpenWrt Project is a Linux operating system targeting embedded devices. In versions prior to both 24.10.6 and 25.12.1, the jp_get_token function, which performs lexical analysis by breaking input expressions into tokens, contains a memory leak vulnerability when extracting string literals, field labels, and regular expressions using dynamic memory allocation. These extracted results are stored in a jp_opcode struct, which is later copied to a newly allocated jp_opcode object via jp_alloc_op. During this transfer, if a string was previously extracted and stored in the initial jp_opcode, it is copied to the new allocation but the original memory is never freed, resulting in a memory leak. This issue has been fixed in versions 24.10.6 and 25.12.1.

Weakness: CWE-401 (Missing Release of Memory after Effective Lifetime)

## Which versions are affected by CVE-2026-30873?

It affects 1 product.


Products: Openwrt Openwrt.

## How do I fix CVE-2026-30873?

No fix has been published for CVE-2026-30873 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-30873 being exploited?

There is no known exploitation of CVE-2026-30873 in the wild and no public exploit code.

## Other vulnerabilities in Openwrt Openwrt

- [CVE-2020-28951](https://insights.sbomify.com/CVE-2020-28951/): Use after free in n/a (critical 9.8)
- [CVE-2026-62948](https://insights.sbomify.com/CVE-2026-62948/): Cross-site scripting in openwrt (critical 9.6)
- [CVE-2026-30871](https://insights.sbomify.com/CVE-2026-30871/): OpenWrt Project has Stack-based Buffer Overflow in DNS PTR Query (critical 9.5)
- [CVE-2026-30872](https://insights.sbomify.com/CVE-2026-30872/): OpenWrt Project has a Stack-based Buffer Overflow vulnerability via IPv6 reverse DNS lookup (critical 9.5)
- [CVE-2021-28961](https://insights.sbomify.com/CVE-2021-28961/): Command injection in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-30873 and fix it if it is affected.

What it is: CVE-2026-30873 is a low-severity denial of service vulnerability in Openwrt Openwrt, published on 19 Mar 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-30873 in the wild and no public exploit code.

Affected product: Openwrt Openwrt. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-30873/ (Markdown: https://insights.sbomify.com/CVE-2026-30873/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-30873
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-30873
- OSV: https://osv.dev/vulnerability/CVE-2026-30873

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-30873/
Summaries are generated and may contain mistakes; the official description above is the record.