6.9

CVE-2025-8396: temporal oss server

Deferred
AliasesCGA-576c-g3jx-p6hqCGA-5x9v-w998-p5gmCGA-hjr7-372g-4rgq
Published 15-09-2025Last modified 15-09-2025

Vulnerability summary

CVE-2025-8396 is a medium (CVSS 6.9) vulnerability in temporal oss server. EPSS estimates a 0.39% chance of exploitation in the next 30 days, higher than 32.9% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 6.9, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.9/10
010
Medium · v4.0 (CVE.org)
EPSS score
0.39%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 3 · Related 6
OPENSUSE-SU-2025:15564-1OPENSUSE-SU-2026:21483-1SUSE-SU-2025:03289-1CGA-7639-FG56-Q8FFCGA-8X4G-GPPR-MXJCCGA-CJ3M-8J94-3MR6

Timeline

  1. 15-09-2025
    PublishedVulnerability first disclosed.
  2. 15-09-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.39%

Chance of exploitation in the next 30 days

Percentile

33%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.39% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard4 products
  • temporal< 1.4.1-r3
  • temporal-compat< 1.4.1-r3
  • temporal-compat-fips< 1.4.1-r3
  • temporal-fips< 1.4.1-r3
Wolfi2 products
  • temporal< 1.4.1-r3
  • temporal-compat< 1.4.1-r3
Go.temporal.io1 product
  • server< 1.26.3 | ≥ 1.27.0-126.0, < 1.27.3 | ≥ 1.28.0-129.0, < 1.28.1
Temporal1 product
  • oss server< 1.26.3 | ≥ 1.27.0, < 1.27.3 | ≥ 1.28.0, < 1.28.1

4 vendors · 8 products

References

7 links