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Advisory severityMedium5.3Red Hat Linux

Medium [CVE-2026-59856] Arbitrary code execution via crafted PHP file in omni-completion

This medium-severity Red Hat Linux advisory covers CVE-2026-59856 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions, Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-59856 Source published Source updated

VulniPulse record published Record updated

CVE-2026-59856
Affected products & platforms
Red Hat LinuxRed Hat Enterprise Linux
Open source advisory

Summary

Vim is an open source, command line text editor. Prior to 9.2.0736, the PHP omni-completion script in runtime/autoload/phpcomplete.vim interpolates a class or trait name, taken from the contents of the edited buffer, into a search() pattern that is run via win_execute() without escaping.

A name containing a single quote can terminate the search() string argument early, and because the bar is honored as an Ex command separator, the remainder of the name is run as Ex commands; via the:! command this allows arbitrary operating-system command execution when a victim opens a crafted PHP file and invokes omni-completion.

This issue is fixed in version 9.2.0736. The PHP omni-completion script improperly handles specially crafted input.

Red Hat Product Security has rated this vulnerability as having a Moderate impact. While successful exploitation allows for arbitrary operating-system command execution when a user opens a crafted PHP file and triggers omni-completion, this feature is disabled by default in Red Hat products.

The requirement for a non-default configuration, combined with mandatory user interaction, significantly reduces the real-world risk." Red Hat severity: Moderate — CVSS 5.3 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L). Weakness: CWE-94.

Is CVE-2026-59856 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-59856 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-59856?

Upgrade to a fixed release named by Red Hat:

  • 9.2.0736
  • vim-2:9.1.083-9.el10_2.12
  • vim-2:9.1.083-5.el10_0.4
  • vim-2:8.2.2637-26.el9_8.13
  • vim-2:8.2.2637-20.el9_2.3
  • vim-2:8.2.2637-20.el9_4.4
  • vim-2:8.2.2637-22.el9_6.4
  • openshift/ose-rhel-coreos-9:4.22.9.8.202608130832-0
  • rhaiis/model-opt-cuda-rhel9:1790621714
  • rhaiis/vllm-cuda-rhel9:1790621718
  • rhaiis/vllm-rocm-rhel9:1790621713
  • rhaii/vllm-rocm-rhel9:1791425869

38 more fixed releases are listed below.

Confirm against the vendor advisory before you patch.

Affected versions
  • < 9.2.0736

Official advisory · high-confidence parse· fetched 9 days ago·verify at source

Fixed versions
  • 9.2.0736
  • vim-2:9.1.083-9.el10_2.12
  • vim-2:9.1.083-5.el10_0.4
  • vim-2:8.2.2637-26.el9_8.13
  • vim-2:8.2.2637-20.el9_2.3
  • vim-2:8.2.2637-20.el9_4.4
  • vim-2:8.2.2637-22.el9_6.4
  • openshift/ose-rhel-coreos-9:4.22.9.8.202608130832-0
  • rhaiis/model-opt-cuda-rhel9:1790621714
  • rhaiis/vllm-cuda-rhel9:1790621718
  • rhaiis/vllm-rocm-rhel9:1790621713
  • rhaii/vllm-rocm-rhel9:1791425869
  • rhaii/vllm-gaudi-rhel9:1791427182
  • rhaii/model-opt-cuda-rhel9:1791803821
  • rhaii/vllm-cuda-rhel9:1791473631
  • rhaii/vllm-spyre-rhel9:1791818357
  • rhaii/vllm-cpu-rhel9:1791473614
  • vim-main-9.2.780-1.hum1
  • insights-proxy/insights-proxy-container-rhel9:1786433656
  • rhai/base-image-rocm-rhel9:1790276886
  • rhai/base-image-tpu-rhel9:1790276884
  • rhai/base-image-cpu-rhel9:1790277045
  • rhai/base-image-spyre-rhel9:1790276889
  • rhai/base-image-cuda-rhel9:1790276974
  • rhai/base-image-tpu-rhel9:1790703497
  • rhai/base-image-rocm-rhel9:1790703506
  • rhai/base-image-cpu-rhel9:1790703590
  • rhai/base-image-spyre-rhel9:1790703568
  • rhai/base-image-cuda-rhel9:1790703586
  • rhai/base-image-rocm-rhel9:1790703494
  • rhai/base-image-cpu-rhel9:1790703615
  • rhai/base-image-tpu-rhel9:1790703516
  • rhai/base-image-rocm-6.4-rhel9:1790703524
  • rhai/base-image-cuda-13.0-rhel9:1790703601
  • rhai/base-image-rocm-7.0-rhel9:1790703516
  • rhai/base-image-cuda-12.9-rhel9:1790703608
  • rhai/base-image-spyre-rhel9:1790703579
  • rhai/base-image-neuron-rhel9:1790703516
  • rhai/base-image-cuda-13.0-rhel9:1791231820
  • rhai/base-image-cuda-12.9-rhel9:1791232257
  • rhai/base-image-neuron-rhel9:1790703542
  • RHSA-2026:48650
  • RHSA-2026:55431
  • RHSA-2026:47982
  • RHSA-2026:72466
  • RHSA-2026:72465
  • RHSA-2026:70818
  • RHSA-2026:54769
  • RHSA-2026:73859
  • RHSA-2026:73929

Official advisory · high-confidence parse· fetched 9 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Users should exercise caution when opening untrusted PHP files and avoid invoking omni-completion on them. To prevent exploitation, the PHP omni-completion script can be disabled by moving or renaming `phpcomplete.vim`. For example, execute `mv /usr/share/vim/vim*/autoload/phpcomplete.vim /usr/share/vim/vim*/autoload/phpcomplete.vim.bak`. This action will disable PHP omni-completion functionality. A restart of Vim is necessary for this change to take effect.

Official advisory · high-confidence parse· fetched 9 days ago·verify at source

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