CVE-2025-8396

mediumpriority · track · 0EPSS 0.004 · 33 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.39% (33rd) EPSS

CVSS 6.9 · medium

Is it mine?

6 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · osv

EPSS · scored 2026-10-27

Insufficiently specific bounds checking on authorization header could lead to denial of service in the Temporal server on all platforms due to excessive memory allocation.This issue affects all platforms and versions of OSS Server prior to 1.26.3, 1.27.3, and 1.28.1 (i.e., fixed in 1.26.3, 1.27.3, and 1.28.1 and later). Temporal Cloud services are not impacted.

cvss

Technical severity, 0–10. One row per scoring source.

6.9

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 2.7–6.9

v4.06.9mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/S:N/AU:Ysecondary · ENISA EU

v4.06.9mediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/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:N/AU:Y/R:X/V:X/RE:X/U:Xsecondary · security@temporal.io

v4.02.7lowCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:L/E:U/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:N/AU:Y/R:X/V:X/RE:X/U:Xsecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-770USCWE-770US

affected products (6)

Products and version ranges known to be affected.

Temporal OSS Server0 → 1.26.3enisa_euvdEU
Temporal OSS Server1.27.0 → 1.27.3enisa_euvdEU
Temporal OSS Server1.28.0 → 1.28.1enisa_euvdEU
Go go.temporal.io/server< 1.26.3osvUSpkg:golang/go.temporal.io/server
Go go.temporal.io/server1.27.0-126.0 → 1.27.3osvUSpkg:golang/go.temporal.io/server
Go go.temporal.io/server1.28.0-129.0 → 1.28.1osvUSpkg:golang/go.temporal.io/server

advisories (2)

Vendor and ecosystem advisories describing this.

GHSA-p768-c3pr-6459Temporal OSS Server Vulnerable to Allocation of Resources Without Limits or Throttling2025-09-15ghsa · osvUS
Insufficiently specific bounds checking on authorization header could lead to denial of service in the Temporal server on all platforms due to excessive memory allocation. This issue affects all platforms and versions of OSS Server prior to 1.26.3, 1.27.3, and 1.28.1 (i.e., fixed in 1.26.3, 1.27.3, and 1.28.1 and later). Temporal Cloud services are not impacted.
GO-2025-3953Temporal OSS Server Vulnerable to Allocation of Resources Without Limits or Throttling in go.temporal.io/server2025-09-17vendor · osvUS
Temporal OSS Server Vulnerable to Allocation of Resources Without Limits or Throttling in go.temporal.io/server

also known as (5)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv NVD CVE.org MITRE

published 2025-09-15modified 2026-06-17

references (10)

External citations — patches, advisories, analysis.

scry

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