by Kastro
Paper/Archive/CVE-2026-123870

CVE-2026-123870

Eclipse Foundation otterdog — [Eclipse CSI - otterdog] Unauthenticated remote code execution via eval() on format-string-injected webhook body when GITHUB_WEBHOOK_SECRET is unset

CVSS 9.5
critical.is priorityof 100
29
CVSS 9.5 (CNA)9.5 / 10 × 3028.5Not in CISA KEV+300.0No EPSS score.000 × 200.0No public exploit+100.0SSVC exploitation: unknown+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
otterdog0.9.0 – < 1.3.21.3.2CNA

Scores by source

eclipse (CNA)9.5CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

References

refgitlab.eclipse.org/security/cve-assignment/-/work_items/554refgithub.com/eclipse-csi/otterdog/security/advisories/GHSA-32xf-7j44-xq72refgithub.com/eclipse-csi/otterdog/commit/bbc9e3ced3665f09fc4632f11b5867524eda7f72