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Response snapshot Nov 2, 2026, 23:56 UTC

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VulnerabilityCVE-2026-89091

A flaw was found in ansible-core.

A flaw was found in ansible-core. When installing a collection with ansible-galaxy collection install, the archive extractor validates member paths using lexical path normalisation (os.path.abspath) instead of resolving symbolic links (os.path.

At a glance

Exploited
Not known
Severity
8.8 High (CVSS 3.1)
Chance of exploitation
0.5% in the next 30 days
Sources
1 source

What to do

Check the vendor advisory for affected versions and fixes.

Read NVD CVE-2026-89091 (opens a new tab)

What happened

A flaw was found in ansible-core. When installing a collection with ansible-galaxy collection install, the archive extractor validates member paths using lexical path normalisation (os.path.abspath) instead of resolving symbolic links (os.path.realpath), and it performs no containment check on symlink-typed directory members before creating them.

A crafted collection tarball can chain symlink directory entries so that a subsequent file member is written outside the intended destination directory. This allows an attacker who can get a victim to install a malicious collection to overwrite arbitrary files with the privileges of the user running ansible-galaxy, leading to code execution on the control node. This is a bypass of the fix for CVE-2020-10691.

Scores and how they were measured

CVSS base severity

8.8

Version 3.1As of

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

0.5%

Scored Percentile 41.4%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Sources

  1. Primary source

    NVD CVE-2026-89091 (opens a new tab)

    NVD record: description, CVSS (the CNA score is preferred), affected products, and publication date. Not evidence of exploitation.

    Published Checked

  2. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  3. Primary source

    NVD CVE API 2.0 (opens a new tab)

    The NVD API page that supplied this CVE record.

    Published Date not suppliedChecked

  4. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-89091, scored 2026-11-02. This is a model estimate, not proof of exposure.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, November 2). A flaw was found in ansible-core. (CVE-2026-89091). https://kevwire.com/record/CVE-2026-89091

MLA

"A flaw was found in ansible-core. (CVE-2026-89091)." KEVWire, 2 Nov. 2026, kevwire.com/record/CVE-2026-89091.

Chicago

KEVWire. "A flaw was found in ansible-core. (CVE-2026-89091)." Last modified November 2, 2026. https://kevwire.com/record/CVE-2026-89091.

Evidence summary (plain text)

A flaw was found in ansible-core. (Oct 8, 2026).
A flaw was found in ansible-core. When installing a collection with
ansible-galaxy collection install, the archive extractor validates member
paths using lexical path normalisation (os.path.abspath) instead of resolving
symbolic links (os.path.realpath), and it performs no containment check on
symlink-typed directory members before creating them. A crafted collection
tarball can chain symlink directory entries so that a subsequent file member is
written outside the intended destination directory.
CVSS 8.8 (version 3.1; evidence as of Nov 2, 2026; https://nvd.nist.gov/vuln/detail/CVE-2026-89091).
EPSS 0.5% for the following 30 days, scored Nov 2, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-89091&date=2026-11-02).
Sources:
NVD CVE-2026-89091: https://nvd.nist.gov/vuln/detail/CVE-2026-89091
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-11-02T22:20:58.510Z&lastModEndDate=2026-11-02T23:55:56.101Z&resultsPerPage=500&startIndex=0
NVD CVE API 2.0: https://services.nvd.nist.gov/rest/json/cves/2.0?lastModStartDate=2026-11-02T21:45:58.195Z&lastModEndDate=2026-11-02T23:20:55.960Z&resultsPerPage=500&startIndex=0
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-89091&date=2026-11-02
Record ID: CVE-2026-89091.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Nov 2, 2026, 23:21 UTC. Ingestion is not an independent editorial investigation.

NVD status: Awaiting Analysis. Publication in the NVD is not evidence of exploitation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

Record JSON

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Record details

Record detail