Temporal OSS Server Vulnerable to Allocation of Resources Without Limits or Throttling

published 2025-09-15 13 mo ago modified 2026-09-10 1 mo ago also GHSA-p768-c3pr-6459 , GO-2025-3953 , EUVD-2025-29200

cvss: 6.9; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits: 0; none known

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.

Patch / fix

fixed in 2 distros 2 links 3

go go.temporal.io/server 1.26.3, 1.27.3, 1.28.1
Temporal OSS Server 1.26.3, 1.27.3, 1.28.1

suse opensuse

govulncheck-vulndb SLE Module for Package Hub 15 SP6, openSUSE Leap 15.6 0.0.20250918T182144-150000.1.107.1

suse advisories SUSE-SU-2025:03289-1

govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
govulncheck-vulndb openSUSE Tumbleweed 0.0.20250917T170349-1.1

opensuse advisories openSUSE-SU-2026:21483-1 openSUSE-SU-2025:15564-1

CISA SSVC

Exploitation: none
Automatable: yes
Technical impact: partial
Assessed: 13 mo ago (2025-09-15)

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	6.9	CVSS: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
CNA	4.0	6.9	CVSS: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

Affected packages

ecosystem	package	affected	fixed in
go	go.temporal.io/server	<1.26.3 >=1.27.0-126.0, <1.27.3 >=1.28.0-129.0, <1.28.1	1.26.3 1.27.3 1.28.1

Affected products

Temporal OSS Server

Classification

Weakness

CWE-770 Allocation of Resources Without Limits or Throttling

References

github.com /temporalio/temporal/releases/tag/v1.26.3
web
github.com /temporalio/temporal/releases/tag/v1.27.3
web
github.com /temporalio/temporal/releases/tag/v1.28.1
web
nvd.nist.gov /vuln/detail/CVE-2025-8396
advisory
github.com /temporalio/temporal
package
github.com /advisories/GHSA-p768-c3pr-6459
advisory

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary