How severe is CVE-2026-27905?

CVE-2026-27905 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-27905 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27905?

CVE-2026-27905 affects Bentoml. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27905?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-27905 have an EU (EUVD) identifier?

Yes. CVE-2026-27905 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9343.

When was CVE-2026-27905 published?

CVE-2026-27905 was published on 2026-03-03 and last updated on 2026-06-17.

CVE-2026-27905

CVE-2026-27905 is a high-severity vulnerability in Bentoml with a CVSS 3.x base score of 7.8. 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-59.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v4: 8.6
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9343
Weakness: CWE-59
Affected product: Bentoml
Published: 2026-03-03
Last modified: 2026-06-17

Description

BentoML is a Python library for building online serving systems optimized for AI apps and model inference. Prior to 1.4.36, the safe_extract_tarfile() function validates that each tar member's path is within the destination directory, but for symlink members it only validates the symlink's own path, not the symlink's target. An attacker can create a malicious bento/model tar file containing a symlink pointing outside the extraction directory, followed by a regular file that writes through the symlink, achieving arbitrary file write on the host filesystem. This vulnerability is fixed in 1.4.36.

Frequently asked questions

What is CVE-2026-27905?: BentoML is a Python library for building online serving systems optimized for AI apps and model inference. Prior to 1.4.36, the safe_extract_tarfile() function validates that each tar member's path is within the destination directory, but for symlink members it only validates the symlink's own path, not the symlink's target. An attacker can create a malicious bento/model tar file containing a symlink pointing outside the extraction directory, followed by a regular file that writes through the symlink, achieving arbitrary file write on the host filesystem. This vulnerability is fixed in 1.4.36.
How severe is CVE-2026-27905?: CVE-2026-27905 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-27905 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27905?: CVE-2026-27905 affects Bentoml. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27905?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-27905 have an EU (EUVD) identifier?: Yes. CVE-2026-27905 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9343.
When was CVE-2026-27905 published?: CVE-2026-27905 was published on 2026-03-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:bentoml:bentoml:*:*:*:*:*:*:*:*

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