CVE-2026-10979 · Google Chrome ANGLE out-of-bounds read information disclosure

01 · The Real Story

This is a peephole in the browser wall, not a door kicked off its hinges

CVE-2026-10979 is an out-of-bounds read in Chrome's ANGLE graphics layer. In plain terms, a malicious webpage can steer the browser into reading memory it should not read and may expose sensitive data from the browser process. The affected range is Google Chrome versions prior to 149.0.7827.53; Google's early stable release notes show 149.0.7827.53/.54 as the fixed desktop train for Windows and Mac.

The vendor baseline of MEDIUM 6.5 is defensible in lab conditions, but it overstates enterprise urgency. The decisive downgrades are practical: the attacker must first win a browser visit to a crafted page, the bug is *information disclosure only* rather than code execution, and there is no reviewed evidence here of KEV listing or active exploitation. In real fleets, this looks much more like a useful exploit-chain primitive than a standalone breach engine.

"Wide browser footprint, but this is still a lure-required info leak, not a patch-everything-tonight Chrome event."

02 · The Attack Path

4 steps from start to impact.

STEP 01

Land the user on a malicious page

The attacker needs a user to browse to attacker-controlled HTML that exercises the vulnerable graphics path, most plausibly through WebGL/renderer activity that flows into ANGLE. The weaponized delivery is just a malicious webpage, not a listening network service, which means the bug is only reachable after a successful lure or redirect.

Conditions required:

Unauthenticated remote attacker
Target user opens attacker-controlled or attacker-influenced web content
Chrome version is older than 149.0.7827.53

Where this breaks in practice:

Requires user interaction (UI:R)
Enterprise web filtering, safe browsing controls, and ad/script controls reduce reach
Some users never hit the vulnerable rendering path during normal browsing

Detection/coverage: Version scanners can identify outdated Chrome builds, but they generally cannot prove exploit delivery. Web proxy, DNS, and browser telemetry are the realistic places to spot the lure domain.

STEP 02

Trigger the ANGLE out-of-bounds read

Once the page is rendered, crafted content drives the browser into the vulnerable ANGLE code path and causes an out-of-bounds read. The practical weapon here is the browser's own graphics stack; there is no shell, service endpoint, or credential step involved.

Conditions required:

Vulnerable Chrome build
Relevant graphics/renderer code path reachable on the endpoint

Where this breaks in practice:

Out-of-bounds read is weaker than out-of-bounds write or use-after-free for attacker impact
Graphics-path bugs can be sensitive to platform, driver, and runtime differences
Browser sandboxing and process isolation constrain what the primitive can directly expose

Detection/coverage: Crash telemetry and browser diagnostics may show renderer/GPU instability, but silent info disclosure is hard to distinguish from normal page activity.

STEP 03

Extract useful memory from the browser process

If the read primitive is reliable enough, the attacker may recover snippets of process memory containing sensitive data. That can matter for tokens, cross-origin secrets, or data useful for follow-on exploitation, but it is still a narrower outcome than direct code execution.

Conditions required:

The primitive must disclose attacker-useful memory rather than random noise
The victim session must actually hold valuable material in the affected process

Where this breaks in practice:

Modern site isolation and process separation limit blast radius
Many disclosures leak low-value or unstable memory fragments
Turning a memory leak into durable business impact usually needs a second bug or a very specific target condition

Detection/coverage: There is no dependable network signature for 'memory leaked from browser process.' Detection is mostly indirect: anomalous browsing, suspicious follow-on auth use, or exploit-chain telemetry.

STEP 04

Chain into something bigger

The realistic high-end use case is not 'data theft only' but pairing this leak with another browser flaw to improve reliability or bypass mitigations. Without that second stage, most enterprises are looking at contained confidentiality risk rather than workstation takeover.

Conditions required:

Attacker has a compatible second-stage exploit or a very targeted data-theft objective

Where this breaks in practice:

No reviewed source here shows an in-the-wild chain using this CVE
Exploit chaining materially raises attacker cost and narrows the target pool
EDR, browser isolation, and account controls can still blunt post-leak value

Detection/coverage: This CVE by itself is hard to detect; downstream stages are more likely to trip EDR, identity, or browser-protection telemetry.

03 · Compensating Control

Verify browser auto-update health — Confirm enterprise policies are not pinning users behind 149.0.7827.53/.54 and that update services are functioning. For a LOW verdict there is no formal noisgate mitigation SLA; do this during normal browser hygiene, not as an emergency change.

Reduce untrusted web execution paths — Use existing safe browsing, DNS/web filtering, and ad/script controls to cut down delivery of attacker-controlled pages. This helps immediately while the fleet naturally rolls forward, but for LOW there is no formal mitigation deadline beyond backlog hygiene.

Prefer browser isolation for high-risk users — Executives, admins, finance, and researchers who routinely open unknown links benefit most from remote browser isolation or equivalent hardened browsing paths. Treat this as risk-tier tuning during standard control maintenance, not a stop-the-line control deployment.

Watch version drift in unmanaged pockets — Kiosk systems, VDI gold images, stale lab Macs, and disconnected laptops are where Chrome lag hides. Sweep those pockets during routine maintenance because LOW severity still deserves closure where the fix is easy.

What doesn't work

MFA does not stop the browser from rendering a malicious page or leaking process memory.
External attack-surface scanning will not find this exposure because Chrome is a client, not an internet-facing service.
EDR alone is not a reliable control for silent browser memory disclosure; it is more useful against any second-stage payload than against this primitive itself.

04 · Intelligence Metadata

The supporting signals.

In-the-wild status	No confirmed active exploitation in reviewed sources. `CVE-2026-10979` is not listed in CISA KEV, and I found no credible campaign reporting tied to this specific CVE.
PoC availability	No credible public PoC surfaced in reviewed sources. That does not mean exploitability is impossible; it means there is no obvious commodity weaponization signal yet.
EPSS	0.00035 — extremely low predicted near-term exploitation probability. FIRST EPSS documentation/API supports pulling current score data for published CVEs.
KEV status	Not KEV-listed as reviewed against CISA's catalog. No KEV date applies.
CVSS vector readout	`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N` = remote triggerable through web content, but only after user interaction, with confidentiality impact only and no direct integrity/availability hit.
Affected versions	Google Chrome prior to `149.0.7827.53`. Google's early stable note shows the desktop fixed train as `149.0.7827.53/.54` for Windows and Mac.
Fixed versions	Desktop: `149.0.7827.53/.54` on the early stable track for Windows/Mac. For managed fleets, also verify that your channel policy is not pinning endpoints behind the fixed train.
Exposure/scanning reality	Shodan/Censys/FOFA data is not meaningful here. This is a client-side browser flaw, not an internet-facing service; external attack-surface tools will not tell you your true exposure.
Disclosure timing	There is a date discrepancy across visible sources: your prompt says 2026-06-04, while the reviewed VulDB entry shows MITRE/public visibility on 2026-06-05. Use June 4, 2026 as the vendor disclosure anchor you supplied, but note the public indexing lag.
Researcher / reporting	No public researcher attribution found in reviewed sources. Public release notes for this CVE batch did not expose a named reporter in the sources I reviewed.

Sources.

05 · The Call

Final Verdict

↓ DOWNGRADED to LOW (3.9/10)

Why this verdict

User interaction is mandatory: the attacker does not get a blind internet-to-host shot; they need the victim to render a crafted page first, which is a meaningful real-world choke point.
Impact is confidentiality-only: this is an out-of-bounds read, not a write/UAF/RCE. That sharply reduces standalone blast radius for enterprise endpoints.
Client-side, not perimeter-exposed: there is no internet-facing service to scan, worm, or mass-spray directly. Exposure depends on browsing behavior, not open ports.
No reviewed exploitation signal: not KEV-listed, EPSS is 0.00035, and I found no credible public campaign reporting for this CVE. That is strong downward pressure versus Chrome zero-day cases.
Exploit-chain dependency: to turn this into a workstation takeover or durable access, the attacker usually needs a second vulnerability or a very specific data target. That compounds friction.

Why not higher?

It is not higher because there is no direct code execution, no authentication bypass, no privilege gain, and no evidence in the reviewed sources that defenders are facing live exploitation pressure. The required victim browse step plus the information-disclosure-only outcome keeps this out of the urgent Chrome-emergency bucket.

Why not lower?

It is not lower because Chrome is ubiquitous, the trigger is remote through ordinary web content, and confidentiality bugs in browser internals can absolutely matter in targeted operations. If you run a large fleet, you still want the fixed build broadly deployed; this just does not justify panic-level change management.

06 · Verification

Crowdsourced verification payload.

Run this on the target endpoint or in your endpoint management tooling to check the locally installed Google Chrome version. Invoke with python3 check_chrome_cve_2026_10979.py on macOS/Linux or py check_chrome_cve_2026_10979.py on Windows; no admin rights are normally required, though registry access on locked-down Windows builds may benefit from standard user context with local read permissions.

noisgate-verify.py

PYTHONREAD-ONLYSAFE

#!/usr/bin/env python3
# check_chrome_cve_2026_10979.py
# Determine whether locally installed Google Chrome is vulnerable to CVE-2026-10979.
# Fixed version threshold: 149.0.7827.53
# Exit codes:
#   0 = PATCHED
#   1 = VULNERABLE
#   2 = UNKNOWN

import os
import platform
import re
import subprocess
import sys

FIXED = "149.0.7827.53"


def normalize_version(v):
    parts = re.findall(r"\d+", v or "")
    if not parts:
        return None
    return tuple(int(p) for p in parts)


def compare_versions(a, b):
    va = normalize_version(a)
    vb = normalize_version(b)
    if va is None or vb is None:
        return None
    maxlen = max(len(va), len(vb))
    va += (0,) * (maxlen - len(va))
    vb += (0,) * (maxlen - len(vb))
    if va < vb:
        return -1
    if va > vb:
        return 1
    return 0


def run_cmd(cmd):
    try:
        cp = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True, timeout=10)
        if cp.returncode == 0:
            return (cp.stdout or cp.stderr).strip()
    except Exception:
        pass
    return None


def extract_version(text):
    if not text:
        return None
    m = re.search(r"(\d+\.\d+\.\d+\.\d+)", text)
    return m.group(1) if m else None


def get_windows_version():
    try:
        import winreg
    except Exception:
        return None

    reg_paths = [
        (winreg.HKEY_CURRENT_USER, r"Software\Google\Chrome\BLBeacon", "version"),
        (winreg.HKEY_LOCAL_MACHINE, r"Software\Google\Chrome\BLBeacon", "version"),
        (winreg.HKEY_LOCAL_MACHINE, r"Software\WOW6432Node\Google\Chrome\BLBeacon", "version"),
    ]

    for hive, path, name in reg_paths:
        try:
            with winreg.OpenKey(hive, path) as key:
                val, _ = winreg.QueryValueEx(key, name)
                ver = extract_version(str(val))
                if ver:
                    return ver
        except Exception:
            continue

    candidates = [
        os.path.expandvars(r"%ProgramFiles%\Google\Chrome\Application\chrome.exe"),
        os.path.expandvars(r"%ProgramFiles(x86)%\Google\Chrome\Application\chrome.exe"),
        os.path.expandvars(r"%LocalAppData%\Google\Chrome\Application\chrome.exe"),
    ]
    for exe in candidates:
        if exe and os.path.exists(exe):
            out = run_cmd([exe, "--version"])
            ver = extract_version(out)
            if ver:
                return ver
    return None


def get_macos_version():
    app = "/Applications/Google Chrome.app/Contents/MacOS/Google Chrome"
    if os.path.exists(app):
        out = run_cmd([app, "--version"])
        ver = extract_version(out)
        if ver:
            return ver
    plist = "/Applications/Google Chrome.app/Contents/Info.plist"
    if os.path.exists(plist):
        out = run_cmd(["/usr/bin/defaults", "read", plist, "CFBundleShortVersionString"])
        ver = extract_version(out)
        if ver:
            return ver
    return None


def get_linux_version():
    binaries = [
        "google-chrome",
        "google-chrome-stable",
        "/opt/google/chrome/chrome",
        "/usr/bin/google-chrome",
        "/usr/bin/google-chrome-stable",
    ]
    for b in binaries:
        if os.path.isabs(b) and not os.path.exists(b):
            continue
        out = run_cmd([b, "--version"])
        ver = extract_version(out)
        if ver:
            return ver
    return None


def main():
    system = platform.system().lower()
    version = None

    if "windows" in system:
        version = get_windows_version()
    elif "darwin" in system:
        version = get_macos_version()
    elif "linux" in system:
        version = get_linux_version()

    if not version:
        print("UNKNOWN - Google Chrome version not found")
        sys.exit(2)

    cmp_result = compare_versions(version, FIXED)
    if cmp_result is None:
        print(f"UNKNOWN - Unable to compare detected version {version} to fixed version {FIXED}")
        sys.exit(2)

    if cmp_result < 0:
        print(f"VULNERABLE - Detected Google Chrome {version} (< {FIXED})")
        sys.exit(1)
    else:
        print(f"PATCHED - Detected Google Chrome {version} (>= {FIXED})")
        sys.exit(0)


if __name__ == "__main__":
    main()