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CVE-2026-52860 vim CVE debrief

CVE-2026-52860 is a high-severity vulnerability in Vim's Python omni-completion feature. Prior to version 9.2.0597, Vim's Python omni-completion executes reconstructed function and class definitions from the current buffer with exec() as part of populating the completion dictionary. This allows a hostile buffer to execute attacker-controlled Python expressions during omni-completion. The existing g:pythoncomplete_allow_import mitigation does not cover this path, as the attacker-controlled code is not a harvested import/from statement.

Vendor
vim
Product
Unknown
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-11
Original CVE updated
2026-08-24
Advisory published
2026-06-11
Advisory updated
2026-08-24

Who should care

Users of Vim, especially those who work with untrusted or user-supplied content, should be aware of this vulnerability and take steps to mitigate it.

Technical summary

The vulnerability exists in Vim's Python omni-completion feature, which executes reconstructed function and class definitions from the current buffer with exec(). This allows a hostile buffer to execute attacker-controlled Python expressions during omni-completion.

Defensive priority

High

Recommended defensive actions

  • Update Vim to version 9.2.0597 or later.
  • Avoid editing untrusted or user-supplied content in Vim.

Evidence notes

The CVE-2026-52860 vulnerability has been patched in Vim version 9.2.0597. References to additional information can be found at [ref-4](https://github.com/vim/vim/commit/c8c63673bc4253212820626aeeb75999d9a539d2), [ref-5](https://github.com/vim/vim/releases/tag/v9.2.0597), [ref-6](https://github.com/vim/vim/security/advisories/GHSA-52mc-rq6p-rc7c), and [ref-7](https://github.com/vim/vim/security/advisories/GHSA-65p9-mwwx-7468).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-52860 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-52860

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-52860 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-52860

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.