CVE-2026-123870 The otterdog webapp evaluates a format-string built from the incoming GitHub webhook JSON body using Python's eval().
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-123870?
CVE-2026-123870 is a critical vulnerability in Eclipse Foundation otterdog, published on 9 Nov 2026.
Official description
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.
Weakness: CWE-95
Which versions are affected by CVE-2026-123870?
How do I fix CVE-2026-123870?
No fix has been published for CVE-2026-123870 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-123870 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-123870 exists.
Sources
Also known as GHSA-32xf-7j44-xq72.