CVE-2026-119566
Prometheus through 3.15.1 Credential Leak via remote_write Cross-Host Redirects
Prometheus through 3.15.1 contains a credential leak vulnerability that allows attackers to capture Azure AD or Google IAM bearer tokens by redirecting remote_write requests to another host. Attackers controlling the remote-write endpoint or a redirecting server can return a 3xx to their host and replay the token, for example to write metrics to the victim's backend.
Fixes and workarounds
Fix
The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.
Source: CNA: VulnCheckAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| prometheus prometheus prometheus/prometheus
github |
≥ 0; ≤ 3.15.1 (affected, semver)
Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 6.3 medium |
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N | CNA: VulnCheck |
| 3.1 / 4.8 medium |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N | CNA: VulnCheck |
| 4.0 / 6.3 medium |
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD: [email protected] |
| 3.1 / 4.8 medium |
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/prometheus/prometheus/blob/v3.15.1/storage/remote/azuread/azuread.go#L326-L333CNA: VulnCheck · technical-description
- https://github.com/prometheus/prometheus/blob/v3.15.1/storage/remote/client.go#L205-L216CNA: VulnCheck · technical-description
- https://github.com/prometheus/common/pull/901CNA: VulnCheck · related, patch, issue-tracking
- https://abraxaslabs.tech/research/prometheus-bearer-redirectCNA: VulnCheck · third-party-advisory
- https://github.com/prometheus/prometheusCNA: VulnCheck · product
- https://www.vulncheck.com/advisories/prometheus-through-3.15.1-credential-leak-via-remote-write-cross-host-redirectsCNA: VulnCheck · third-party-advisory
- https://abraxaslabs.tech/research/prometheus-bearer-redirect[email protected]
- https://github.com/prometheus/common/pull/901[email protected]
- https://github.com/prometheus/prometheus[email protected]
- https://github.com/prometheus/prometheus/blob/v3.15.1/storage/remote/azuread/azuread.go#L326-L333[email protected]
- https://github.com/prometheus/prometheus/blob/v3.15.1/storage/remote/client.go#L205-L216[email protected]
- https://www.vulncheck.com/advisories/prometheus-through-3.15.1-credential-leak-via-remote-write-cross-host-redirects[email protected]
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