CVSS 4.0
9.5 criticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:HCVE-2026-123870 [Eclipse CSI - otterdog] Unauthenticated remote code execution via eval() on format-string-injected webhook body when GITHUB_WEBHOOK_SECRET is unset
Critical (9.5) in eclipse foundation otterdog. EPSS 0.3% estimated probability of exploitation activity in the next 30 days.
On this page
The otterdog webapp evaluates a format-string built from the incoming GitHub webhook JSON body using Python's eval(). When the GITHUB_WEBHOOK_SECRET configuration value is unset or empty (the code default is None), the HMAC signature check is skipped entirely, allowing an unauthenticated network client to reach the eval() sink with attacker-controlled input and execute arbitrary Python on the webapp host.
Severity
- EPSS
- 0.3% estimated probability of exploitation activity in the next 30 days; 23rd percentile. Scored 2026-11-13. A forecast for this CVE across the internet, not for your own systems.
- CISA's assessment (SSVC)
- Exploitation: PoC · Automatable: no · Technical impact: total, assessed 2026-11-12. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
- CWE
- CWE-95 Improper Neutralization of Directives in Dynamically Evaluated Code (Eval Injection)
- OWASP Top 10
- A05:2025 Injection
- Published
- Modified
- Assigned by
- eclipse (CNA)
- NVD analysis
- Deferred: the NVD does not plan to analyze it
- Record from
- the NVD, synced
Ask an AI about this CVE
Show the prompt
Explain CVE-2026-123870 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-123870?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-123870?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-123870 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
Badge for a README or a site
An image that stays current: it is drawn from the data each time it is fetched (a host that proxies images, as GitHub does, may show its copy for a while). Markdown:
[](https://cve.bz/cve/CVE-2026-123870)
HTML:
<a href="https://cve.bz/cve/CVE-2026-123870"><img src="https://cve.bz/cve/badge/CVE-2026-123870.svg" alt="CVE-2026-123870"></a>
Affected
- eclipse foundation:otterdog
Versions
From the CNA's record in the CVE List.
| Product | Affected |
|---|---|
| Eclipse Foundation otterdog | from 0.9.0 before 1.3.2 |
Attack patterns (CAPEC)
- CAPEC-35 Leverage Executable Code in Non-Executable Files Likelihood: High · Severity: Very High
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.
History
- The NVD deferred its analysis
Changes since this site first stored the record. The same for every record: /api/public/changes.