What is CVE-2026-88883?

CVE-2026-88883 is a high-severity vulnerability in Renovatebot Renovate, classified under Insertion of Sensitive Information into Log File. CVSS score: 7.7/10. Published 2026-09-10.

How severe is CVE-2026-88883?

High severity. CVSS v3 base score is 7.7 out of 10.

Information disclosure in Renovatebot Renovate

CVE-2026-88883

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.

Published 2026-09-10 · last modified 2026-09-29.

CVSS v3 metric

CVSS v3 base score 7.7 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (31.5th percentile), scored 2026-10-25.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 31st percentile — 31.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Renovatebot Renovate

Weakness classification (CWE)

CWE-532 — Insertion of Sensitive Information into Log File

References

github.com/renovatebot/renovate/security/advisories/GHSA-4hmw-qw74-vrhm (vendor-advisory)
www.vulncheck.com/advisories/renovate-before-44.14.4-tls-private-key-log-saniti… (third-party-advisory)

Frequently asked questions

What is CVE-2026-88883?: CVE-2026-88883 is a high-severity vulnerability in Renovatebot Renovate, classified under Insertion of Sensitive Information into Log File. CVSS score: 7.7/10. Published 2026-09-10.
How severe is CVE-2026-88883?: High severity. CVSS v3 base score is 7.7 out of 10.