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CVE-2026-118237

CVSS 8.2 (HIGH)

Published: 11/2/2026

CVE-2026-118237 - Out-of-bounds read vulnerability in GitHub Enterprise Server allowed disclosure...

Affected Packagesgit, git-man

Supported Environmentsubuntu, debian, linux-mint, rocky, rhel, almalinux, oracle-linux, suse, alpine, arch, fedora, amazon-linux, kernel, gentoo, freebsd, openbsd, netbsd, macos, wolfi, nixos, void, photon, flatcar, talos, openwrt, openeuler, cloudlinux, kali, azure-linux, centos-stream, opensuse-leap, fedora-coreos, proxmox, truenas-scale, windows

Cryptographic ProvenanceSLSA Level 3 (Cosign OIDC Signed)

⚡ Autonomous Live Mitigation(Zero-Downtime • Sub-50ms Rollback)

Deploy this patch across production Linux or Windows Server fleets with pre-flight sentinels and instant rollback guarantee.

exultia.exe patch --vendor --os windows-server

Tier 1

Zero-Downtime Hot-Mitigation Script

No reboot or service downtime

Block git file:// submodule transport, disable symbolic link checkout and enforce fsckObjects in system gitconfig, and upgrade git binary.

mkdir -p /etc/exultia/mitigations
printf "[protocol \"file\"]\n\tallow = never\n[core]\n\tsymlinks = false\n[transfer]\n\tfsckObjects = true\n" > /etc/exultia/mitigations/git-cve-2026-118237.conf
(command -v git >/dev/null 2>&1 && git config --system protocol.file.allow never 2>/dev/null && git config --system core.symlinks false 2>/dev/null) || true
if command -v dpkg-query >/dev/null 2>&1 && dpkg-query -W -f='${Status}' git 2>/dev/null | grep -q 'install ok installed'; then DEBIAN_FRONTEND=noninteractive apt-get -o DPkg::Lock::Timeout=30 install --only-upgrade -y git git-man >/dev/null 2>&1 || true; elif command -v apk >/dev/null 2>&1 && apk info -e git >/dev/null 2>&1; then apk upgrade --no-cache git >/dev/null 2>&1 || true; elif command -v dnf >/dev/null 2>&1 && rpm -q git >/dev/null 2>&1; then dnf upgrade -y git git-core >/dev/null 2>&1 || true; fi

🔍 Verification Sentinel Probe:

test -s /etc/exultia/mitigations/git-cve-2026-118237.conf && grep -q "fsckObjects = true" /etc/exultia/mitigations/git-cve-2026-118237.conf

⏪ Sub-50ms Deterministic Rollback:

rm -f /etc/exultia/mitigations/git-cve-2026-118237.conf; (command -v git >/dev/null 2>&1 && git config --system --unset protocol.file.allow 2>/dev/null && git config --system --unset core.symlinks 2>/dev/null) || true

Tier 3

Serialized 10% Canary Ansible Playbook

Fleet configuration management

Hardened Ansible playbook with staged canary progression (serial: 10%), configuration validation, and handler reload.

---
- name: Exultia Validated Fix - CVE-2026-118237 (Git SCM & Repository Engine)
  hosts: all
  become: yes
  serial: "10%"
  tasks:
    - name: Apply Validated Fix (EXPR-GIT-PROTOCOL-LOCKDOWN)
      ansible.builtin.shell: |
        mkdir -p /etc/exultia/mitigations
        printf "[protocol \"file\"]\n\tallow = never\n[core]\n\tsymlinks = false\n[transfer]\n\tfsckObjects = true\n" > /etc/exultia/mitigations/git-cve-2026-118237.conf
        (command -v git >/dev/null 2>&1 && git config --system protocol.file.allow never 2>/dev/null && git config --system core.symlinks false 2>/dev/null) || true
        if command -v dpkg-query >/dev/null 2>&1 && dpkg-query -W -f='${Status}' git 2>/dev/null | grep -q 'install ok installed'; then DEBIAN_FRONTEND=noninteractive apt-get -o DPkg::Lock::Timeout=30 install --only-upgrade -y git git-man >/dev/null 2>&1 || true; elif command -v apk >/dev/null 2>&1 && apk info -e git >/dev/null 2>&1; then apk upgrade --no-cache git >/dev/null 2>&1 || true; elif command -v dnf >/dev/null 2>&1 && rpm -q git >/dev/null 2>&1; then dnf upgrade -y git git-core >/dev/null 2>&1 || true; fi
      args:
        executable: /bin/sh
      register: kinetic_exec
      failed_when: kinetic_exec.rc != 0

    - name: Verify Post-Fix Gate
      ansible.builtin.shell: "test -s /etc/exultia/mitigations/git-cve-2026-118237.conf && grep -q "fsckObjects = true" /etc/exultia/mitigations/git-cve-2026-118237.conf"
      changed_when: false

Tier 2

Vendor OS Package Upgrade Commands

Native package manager reconciliation

ubuntu

DEBIAN_FRONTEND=noninteractive apt-get update -qq && DEBIAN_FRONTEND=noninteractive apt-get install --only-upgrade -y git git-man

debian

DEBIAN_FRONTEND=noninteractive apt-get update -qq && DEBIAN_FRONTEND=noninteractive apt-get install --only-upgrade -y git git-man

kali

DEBIAN_FRONTEND=noninteractive apt-get update -qq && DEBIAN_FRONTEND=noninteractive apt-get install --only-upgrade -y git git-man

linux-mint

DEBIAN_FRONTEND=noninteractive apt-get update -qq && DEBIAN_FRONTEND=noninteractive apt-get install --only-upgrade -y git git-man

proxmox

DEBIAN_FRONTEND=noninteractive apt-get update -qq && DEBIAN_FRONTEND=noninteractive apt-get install --only-upgrade -y git git-man

truenas-scale

DEBIAN_FRONTEND=noninteractive apt-get update -qq && DEBIAN_FRONTEND=noninteractive apt-get install --only-upgrade -y git git-man

rockydnf upgrade -y git git-core

rheldnf upgrade -y git git-core

almalinuxdnf upgrade -y git git-core

oracle-linuxdnf upgrade -y git git-core

cloudlinuxdnf upgrade -y git git-core

amazon-linuxdnf upgrade -y git git-core

fedoradnf upgrade -y git git-core

openeulerdnf upgrade -y git git-core

centos-streamdnf upgrade -y git git-core

azure-linuxtdnf update -y git git-core

photontdnf update -y git git-core

alpineapk update -q && apk upgrade --no-cache git

wolfiapk update -q && apk upgrade --no-cache git

susezypper --non-interactive update git git-core

opensuse-leapzypper --non-interactive update git git-core

archpacman -S --noconfirm git

gentooemerge --update --oneshot git

voidxbps-install -Su -y git

nixosnix-env -u git

openwrtopkg update && opkg upgrade git

freebsdpkg upgrade -y git

openbsdsyspatch

netbsdpkgin -y upgrade

fedora-coreosrpm-ostree upgrade

flatcarupdate_engine_client -check_for_update

talostalosctl upgrade-k8s

macossoftwareupdate -i -a

Full Standalone Hotfix Script

Complete, self-contained remediation script with privileges check, logging, pre-flight safety, and automatic rollback on verification failure:

#!/bin/sh
# ==============================================================================
# Exultia Surgical Remediation: CVE-2026-118237
# Title: CVE-2026-118237 - Out-of-bounds read vulnerability in GitHub Enterprise Server allowed disclosure...
# CVSS Score: 8.2 (HIGH) | CISA KEV: NO
# Provenance: [email protected] (Cosign OIDC Keyless) | SLSA Level 3
# Generated by Exultia Autonomous Remediation Engine (https://exultia.tech/cve/CVE-2026-118237)
# ==============================================================================
set -e

log() { echo "[Exultia] $(date +'%Y-%m-%d %H:%M:%S') $1"; }
err() { echo "[Exultia] ERROR: $1" >&2; exit 1; }

if [ "$(id -u)" -ne 0 ]; then
  err "Root privileges required. Run with sudo or as root."
fi

log "Initiating zero-downtime hot-mitigation for CVE-2026-118237..."

# Apply mitigation commands
log "Executing: mkdir -p /etc/exultia/mitigations"
mkdir -p /etc/exultia/mitigations
log "Executing: printf \"[protocol \\"file\\"]\n\tallow = never\n[core]\n\tsymlinks = false\n[transfer]\n\tfsckObjects = true\n\" > /etc/exultia/mitigations/git-cve-2026-118237.conf"
printf "[protocol \"file\"]\n\tallow = never\n[core]\n\tsymlinks = false\n[transfer]\n\tfsckObjects = true\n" > /etc/exultia/mitigations/git-cve-2026-118237.conf
log "Executing: (command -v git >/dev/null 2>&1 && git config --system protocol.file.allow never 2>/dev/null && git config --system core.symlinks false 2>/dev/null) || true"
(command -v git >/dev/null 2>&1 && git config --system protocol.file.allow never 2>/dev/null && git config --system core.symlinks false 2>/dev/null) || true
log "Executing: if command -v dpkg-query >/dev/null 2>&1 && dpkg-query -W -f='${Status}' git 2>/dev/null | grep -q 'install ok installed'; then DEBIAN_FRONTEND=noninteractive apt-get -o DPkg::Lock::Timeout=30 install --only-upgrade -y git git-man >/dev/null 2>&1 || true; elif command -v apk >/dev/null 2>&1 && apk info -e git >/dev/null 2>&1; then apk upgrade --no-cache git >/dev/null 2>&1 || true; elif command -v dnf >/dev/null 2>&1 && rpm -q git >/dev/null 2>&1; then dnf upgrade -y git git-core >/dev/null 2>&1 || true; fi"
if command -v dpkg-query >/dev/null 2>&1 && dpkg-query -W -f='${Status}' git 2>/dev/null | grep -q 'install ok installed'; then DEBIAN_FRONTEND=noninteractive apt-get -o DPkg::Lock::Timeout=30 install --only-upgrade -y git git-man >/dev/null 2>&1 || true; elif command -v apk >/dev/null 2>&1 && apk info -e git >/dev/null 2>&1; then apk upgrade --no-cache git >/dev/null 2>&1 || true; elif command -v dnf >/dev/null 2>&1 && rpm -q git >/dev/null 2>&1; then dnf upgrade -y git git-core >/dev/null 2>&1 || true; fi

# Execute verification sentinel probe
log "Executing verification sentinel probe..."
if test -s /etc/exultia/mitigations/git-cve-2026-118237.conf && grep -q "fsckObjects = true" /etc/exultia/mitigations/git-cve-2026-118237.conf; then
  log "SUCCESS: Verification passed. CVE-2026-118237 successfully mitigated."
else
  log "CRITICAL: Verification sentinel failed! Initiating emergency rollback..."
  rm -f /etc/exultia/mitigations/git-cve-2026-118237.conf; (command -v git >/dev/null 2>&1 && git config --system --unset protocol.file.allow 2>/dev/null && git config --system --unset core.symlinks 2>/dev/null) || true
  err "Rollback complete. System restored to baseline state."
fi