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CVE-2025-8396

Insufficiently specific bounds checking on authorization header could lead to denial of service in the Temporal server on all platforms…

Medium6.9EPSS 0.39%
Published
Updated
Reserved
Assigned by
Temporal

Description

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.

Scores

CVSS scores of CVE-2025-8396, by who scored it
Scored byCVSSScoreVector
TemporalCNA (assigner)4.0Medium6.9CVSS: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:Y
NVDNVD · Deferred4.0Medium6.9CVSS: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:X
EPSS (exploitation in 30 days)
0.39% · top 67% of all CVEs (6 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: yes · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.9.

Weakness

Affected products

  • Temporal · OSS Server

    • affected < 1.26.3
    • affected 1.27.0 – < 1.27.3
    • affected 1.28.0 – < 1.28.1

Affected packages

From reviewed advisories of the GitHub Advisory Database.

What to do

Solution: Upgrade to a fixed release: v1.26.3, v1.27.3, v1.28.1 or later (latest recommended).

Workaround: Use mTLS, or bring your own claim mapper.

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .