# QOS.CH logback-core Expression Language Injection vulnerability

Advisory record · `GHSA-pr98-23f8-jwxv`

- **Identifiers:** `GHSA-pr98-23f8-jwxv` · `CVE-2024-12798`
- **State:** Confirmed
- **Severity:** CVSS 5.9 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-917](https://cwe.mitre.org/data/definitions/917.html)
- **Tags:** [Code injection](https://agentprime.io/advisories/tag/code-injection.md)
- **Published:** 19 Dec 2024
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 19 Dec 2024, 18:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `ch.qos.logback:logback-core` (Maven): affected `>=1.4.0, <1.5.13 || <1.3.15`; fixed in `1.5.13`, `1.3.15`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Logback-core versions 1.3.15 and earlier in the 1.3 line, and 1.4.0 through 1.5.12, are vulnerable through the JaninoEventEvaluator extension. An attacker who can write to a logback configuration file, or set an environment variable that points to a malicious configuration file before the program starts, can execute arbitrary code. Upgrade to logback-core 1.5.13 or 1.3.15.

Written 2 Nov 2026.

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 5.9 Medium, CVSS 4.0: `CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:L/VI:H/VA:L/SC:L/SI:H/SA:L/RE:L/U:Clear`, from CNA (NCSC.ch)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0046, the 40th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:17 UTC: First seen by agentprime
- 31 Oct 2026, 14:17 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-pr98-23f8-jwxv)

## Sources

- [GitHub Advisory Database: GHSA-pr98-23f8-jwxv](https://github.com/advisories/GHSA-pr98-23f8-jwxv)
- [OSV: GHSA-pr98-23f8-jwxv](https://osv.dev/vulnerability/GHSA-pr98-23f8-jwxv)
- <https://nvd.nist.gov/vuln/detail/CVE-2024-12798>
- <https://github.com/qos-ch/logback/commit/2cb6d520df7592ef1c3a198f1b5df3c10c93e183>
- <https://github.com/qos-ch/logback>
- <https://logback.qos.ch/news.html#1.3.15>
- <https://logback.qos.ch/news.html#1.5.13>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-pr98-23f8-jwxv>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-pr98-23f8-jwxv/>. Everything for agents: <https://agentprime.io/llms.txt>.