CVE-2026-88883 Renovate before 44.14.4 TLS Private Key Log Sanitisation
Incomplete log sanitization allows attackers with log access to recover TLS private keys when Mutual TLS is configured without using the secrets feature.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-88883?
CVE-2026-88883 is a high-severity vulnerability in mend-renovate-ce, published on 10 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Renovate is an automated dependency update tool. In versions before 44.14.4 (and Mend Renovate CE/EE images before 15.4.0 and the mend-renovate-enterprise-edition Helm chart before 10.4.0), log sanitisation for TLS private keys used for Mutual TLS was incomplete. While the value of hostRules[].httpsPrivateKey was redacted in the field itself, the same private key value was not redacted if it also appeared elsewhere — for example in another configuration option or in a log message under a key other than httpsPrivateKey — causing the full private key to be written to Renovate's logs in cleartext. This affects deployments that configure Mutual TLS through hostRules[].httpsPrivateKey without passing the value through the documented `secrets` configuration. Anyone able to read the resulting logs can recover the private key. The issue is fixed in Renovate 44.14.4, which redacts any value supplied as hostRules[].httpsPrivateKey wherever it appears in the logs; as a workaround, supply the key via the `secrets` configuration.
Weakness: CWE-532
Which versions are affected by CVE-2026-88883?
How do I fix CVE-2026-88883?
No fix has been published for CVE-2026-88883 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-88883 being exploited?
There is no known exploitation of CVE-2026-88883 in the wild and no public exploit code.
Sources
Also known as GHSA-4hmw-qw74-vrhm, GHSA-qfw4-mmpc-67w5.