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CVE-2026-119566

Prometheus through 3.15.1 Credential Leak via remote_write Cross-Host Redirects

6.3 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.20%Unchanged since Oct 31, 2026
90%50%10%1%

What each source reports

CVE List Score used 6.3

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.

Record
CVE-2026-119566
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-522
Updated
2026-11-04
EUVDEUVD-2026-113831 6.3

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.

Record
EUVD-2026-113831
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-04
GitHub AdvisoriesGHSA-597x-6fqq-75wr 6.3

Prometheus through 3.15.1 contains a credential leak vulnerability that allows attackers to...

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.

Record
GHSA-597x-6fqq-75wr
CVSS 4.0
6.3 MediumCVSS: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
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-522
Updated
2026-11-02
NVD 6.3

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.

Record
CVE-2026-119566
CVSS 4.0
6.3 MediumCVSS: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
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Weakness
CWE-522
Updated
2026-11-05
OSV 6.3

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.

Record
CVE-2026-119566
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-522
Updated
2026-11-05
OSVDEBIAN-CVE-2026-119566 6.3

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.

Record
DEBIAN-CVE-2026-119566
CVSS 4.0
6.3 MediumCVSS: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
Updated
2026-11-05
OSVUBUNTU-CVE-2026-119566 6.3

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.

Record
UBUNTU-CVE-2026-119566
CVSS 4.0
6.3 MediumCVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
4.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Updated
2026-11-05
OSVAZL-112688 No score

CVE-2026-119566 affecting package telegraf 1.31.0-36

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.

Record
AZL-112688
Updated
2026-11-05

Affected products

Affected packages

Affected packages
PackageAffectedFixed
telegraf
Azure Linux:3
through 1.31.0-36 None known
golang-github-prometheus-common
Debian:12
All versions, plus listed versions
0.39.0-20.42.0-10.42.0-20.44.0-10.44.0-2
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0.44.0-30.44.0-40.45.0-10.45.0-20.45.0-30.46.0-10.47.0-10.47.0-20.48.0-10.49.0-10.50.0-10.51.0-10.52.2-10.53.0-10.55.0-10.55.0-20.57.0-10.59.1-10.59.1-20.60.0-10.60.1-10.61.0-10.62.0-10.62.0-20.62.0-30.63.0-10.63.0-20.65.0-10.67.4-10.67.5-10.68.1-10.69.0-1
None known
golang-github-prometheus-common
Debian:13
All versions, plus listed versions
0.62.0-30.63.0-10.63.0-20.65.0-10.67.4-10.67.5-10.68.1-10.69.0-1
None known
golang-github-prometheus-common
Debian:14
before 0.69.0-1, plus listed versions
0.62.0-30.63.0-10.63.0-20.65.0-10.67.4-10.67.5-10.68.1-1
0.69.0-1
golang-github-prometheus-common
Ubuntu:16.04:LTS
All versions, plus listed versions
0+git20160104.0a3005b-1
None known
golang-github-prometheus-common
Ubuntu:18.04:LTS
All versions, plus listed versions
0+git20170707.3e6a763-10+git20171117.2e54d0b-10+git20180110.89604d1-1
None known
golang-github-prometheus-common
Ubuntu:20.04:LTS
All versions, plus listed versions
0+git20181119.b36ad28-20.7.0-1
None known
golang-github-prometheus-common
Ubuntu:22.04:LTS
All versions, plus listed versions
0.15.0-2ubuntu10.32.1-50.32.1-5ubuntu1
None known
golang-github-prometheus-common
Ubuntu:24.04:LTS
All versions, plus listed versions
0.44.0-40.45.0-30.46.0-10.47.0-2
None known
golang-github-prometheus-common
Ubuntu:26.04:LTS
All versions, plus listed versions
0.62.0-30.67.4-1
None known

History

History
RecordedChangedSources
affected, aliases, referencesCVE List, EUVD, NVD, OSV
affected, aliases, facts, referencesOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-119566 is a medium vulnerability (CVSS 6.3) in Prometheus, published October 30, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.20%, the 10th percentile. Fixed in golang-github-prometheus-common 0.69.0-1.

References

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