How severe is CVE-2026-108789?

CVE-2026-108789 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2026-108789 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-108789?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2026-108789 published?

CVE-2026-108789 was published on 2026-10-12 and last updated on 2026-10-13.

CVE-2026-108789

CVE-2026-108789 is a medium-severity vulnerability with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-840.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 6.5
CVSS v4: 2.0
EPSS exploit prediction: 0% (7th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-840
Published: 2026-10-12
Last modified: 2026-10-13

Description

A vulnerability was identified in deepseek-ai deepseek-harness up to 0.1.1-rc.2. This affects the function agent of the component dsh-workflow-worker-thread. The manipulation leads to enforcement of behavioral workflow. The attack is possible to be carried out remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.

Frequently asked questions

What is CVE-2026-108789?: A vulnerability was identified in deepseek-ai deepseek-harness up to 0.1.1-rc.2. This affects the function agent of the component dsh-workflow-worker-thread. The manipulation leads to enforcement of behavioral workflow. The attack is possible to be carried out remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
How severe is CVE-2026-108789?: CVE-2026-108789 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2026-108789 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (7th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-108789?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2026-108789 published?: CVE-2026-108789 was published on 2026-10-12 and last updated on 2026-10-13.

References

Other CWE-840 vulnerabilities

CVE-2022-4719 — Critical (CVSS 9.8): Business Logic Errors in GitHub repository ikus060/rdiffweb prior to 2.5.5.
CVE-2022-3363 — Critical (CVSS 9.8): Business Logic Errors in GitHub repository ikus060/rdiffweb prior to 2.5.0a7.
CVE-2021-4171 — Critical (CVSS 9.8): calibre-web is vulnerable to Business Logic Errors
CVE-2024-39671 — Critical (CVSS 9.3): Access control vulnerability in the security verification module. Impact: Successful exploitation of this vulnerability…
CVE-2024-54098 — High (CVSS 8.5): Service logic error vulnerability in the system service module Impact: Successful exploitation of this vulnerability…
CVE-2026-58558 — High (CVSS 7.8): Permission control vulnerability in the file system. Impact: Successful exploitation of this vulnerability may affect…

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