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CVE-2026-119566medium6.3

Prometheus through 3.15.1 Credential Leak via remote_write Cross-Host Redirects

Impact

Prometheus through 3.15.1 has a credential leak vulnerability via remote_write cross-host redirects, allowing attackers to capture Azure AD or Google IAM bearer tokens. Attackers need control of the remote-write endpoint or a redirecting server. The impact is a potential credential leak.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Affected packages

This source has no supported package-version data for matching. You can read the advisory here, but this record alone cannot power a dependency check.

Affected products

Vendor version evidence. Product records are separate from automatic dependency matching.

prometheus · VulnCheck

prometheus

1 range
VulnCheck version evidence

Package identity

pkg:github/prometheus/prometheus

Identity supplied by VulnCheck. Version matching requires compatible range evidence.

Compare with this publisher’s ranges. This does not inspect your installation.

affected

0 → through 3.15.1

semver versions

unaffected

unknown

Other versions: unaffected

Original source description

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.

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-119566

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-522 ↗

Insufficiently Protected Credentials

VulnCheck

Related →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

VulnCheck · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:a:prometheus:prometheus:*:*:*:*:*:*:*:*

Through (inclusive): 3.15.1

Original applicability statements
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:a:prometheus:prometheus:*:*:*:*:*:*:*:*",
            "versionEndIncluding": "3.15.1"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 1
VulnCheck

Assigning organization

2026-10-30

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.

References

6 sources
github.com/prometheus/common/pull/901
relatedVulnCheck
github.com/prometheus/prometheus/blob/v3.15.1/storage/remote/azuread/azuread.go
technical-descriptionVulnCheck
github.com/prometheus/prometheus/blob/v3.15.1/storage/remote/client.go
technical-descriptionVulnCheck
abraxaslabs.tech/research/prometheus-bearer-redirect
third-party-advisoryVulnCheck
github.com/prometheus/prometheus
productVulnCheck
www.vulncheck.com/advisories/prometheus-through-3.15.1-credential-leak-via-remote-write-cross-host-redirects
third-party-advisoryVulnCheck