CVE-2026-110865: Renovate HTTP header allowlist bypass in shared presets

CVE-2026-110865 · Severity: high · CVSS 7.1 · Published 2026-10-14

Renovate is a dependency management tool used by development teams to automatically update software libraries and dependencies in repositories. An allowlist bypass vulnerability allows repository users to inject custom HTTP headers into requests by placing restricted configuration inside shared presets, potentially exposing sensitive credentials or internal headers. This could let attackers intercept or manipulate requests to external services that Renovate communicates with.

Technologies: Mend Renovate-Ce, Mend Renovate-Ee-Server, Mend Renovate-Ee-Worker. Vendors: Mend.

Quick answers

Is CVE-2026-110865 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-110865 being exploited in the wild.
How severe is CVE-2026-110865?
High severity, with a CVSS score of 7.1, published 14 October 2026.
Which products and versions are affected?
Mend Renovate before 44.60.1; Mend Renovate-Ce before 15.5.0; Mend Renovate-Ee-Server before 15.5.0; Mend Renovate-Ee-Worker before 15.5.0.
Is there a fix for CVE-2026-110865?
Yes: fixed in Renovate 44.60.1, 44.119.0 (recommended for administrators setting headers); Renovate CE 15.5.0; Renovate EE Server 15.5.0; Renovate EE Worker 15.5.0; Mend Renovate CE Helm chart 15.5.0; Mend Renovate Enterprise Edition Helm chart 10.5.0. Until then: Self-hosted administrators restricting HTTP headers should upgrade to 44.119.0 or later, where administrator-set headers are implicitly allowed and no longer require allowlist entries, reducing exposure of the allowlist to repository users. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-110865 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-110865?
Check whether you run Mend Renovate, Mend Renovate-Ce, Mend Renovate-Ee-Server or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • Fixed in: Renovate 44.60.1, 44.119.0 (recommended for administrators setting headers); Renovate CE 15.5.0; Renovate EE Server 15.5.0; Renovate EE Worker 15.5.0; Mend Renovate CE Helm chart 15.5.0; Mend Renovate Enterprise Edition Helm chart 10.5.0

Self-hosted administrators restricting HTTP headers should upgrade to 44.119.0 or later, where administrator-set headers are implicitly allowed and no longer require allowlist entries, reducing exposure of the allowlist to repository users.

Technical details

The vulnerability is an improper input validation issue (CWE-424) where hostRules headers are validated when specified directly in repository configuration but not when included in shared presets. An attacker with repository access or control over a shared preset can bypass the allowedHeaders allowlist by placing hostRules[].headers entries in presets, allowing injection of unauthorized HTTP headers into outbound requests. This affects all versions before 44.60.1 (npm) and 15.5.0 (Docker distributions); no user interaction is required beyond normal Renovate operation.

Affected products

  • Mend Renovate before 44.60.1
  • Mend Renovate CE before 15.5.0
  • Mend Renovate EE Server before 15.5.0
  • Mend Renovate EE Worker before 15.5.0

Timeline

  • 2026-09-29: disclosed
  • 2026-10-14: advisory

References

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