DaystoPatch

GoogleExploited incident

Google Chromium V8 Out of Bounds Write Vulnerability

CVE-2026-87491High, CVSS 8.8In CISA's Known Exploited Vulnerabilities catalog since 9 Sep 2026

Automated timeline. Not yet checked by a researcher, so it doesn't count toward any grade.

FixedFixed for every supported version under an hour after the first public report.

Response

Silence
0h
First public report to first vendor statementUnverified source
Exposure
0h
First public report to first fixUnverified source
Follow-through
<1h
First public report to a fix for every supported versionUnverified source
  • Vendor silent
  • Vendor statement, no fix
  • Fixed for some versions
  • Fixed when disclosed
  • Date only, no time of day

Timeline and evidence

Open a moment to see its source and archived quote.

  1. First public report

    Unverified: quote not found in the archived copy

    Google advisory chrome-2312771101612558943/CVE-2026-87491ClaimedQuote not found in archive

    The Chrome team is delighted to announce the promotion of Chrome 153 to the stable channel for Windows, Mac and Linux.

    Vendor advisory was the first public report.

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    sha256:5786fecfe0bf3cf0…
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    6 more sources for this moment
    Google advisory chrome-2312771101612558943/CVE-2026-87491ClaimedQuote verified8 Sep 2026, 21:24 UTC

    The Chrome team is delighted to announce the promotion of Chrome 153 to the stable channel for Windows, Mac and Linux. This will roll out over the coming days/weeks. Chrome 153.0.8010.36 (Linux)

    The vendor's own disclosure.

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    CISA KEV (CVE-2026-87491)ClaimedQuote verified9 Sep 2026

    Google Chromium V8 Out of Bounds Write Vulnerability

    Added to CISA's KEV catalog on 2026-09-09.

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    sha256:ef8fffede5c47200…
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    CVE.org record CVE-2026-87491ClaimedQuote verified9 Sep 2026, 00:09 UTC

    Out of bounds write in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

    CVE record published.

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    sha256:09f710e603c1dff8…
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    Bluesky postClaimedQuote not checked yet9 Sep 2026, 00:17 UTC

    Google patched a Chrome zero-day, CVE-2026-87491, exploited in the wild. Chrome 153 fixes 230 flaws including critical WebGL bugs. Update now.

    Earliest third-party post we hold.

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    Bluesky post social
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    Mastodon postClaimedQuote not checked yet9 Sep 2026, 09:45 UTC

    Google Patches Actively Exploited Chrome Zero-Day Enabling Sandbox Code Execution Google just patched a major vulnerability in Chrome that allowed hackers to execute malicious code inside the

    Earliest third-party post we hold.

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    Mastodon post social
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    Research: volexityClaimedQuote verified9 Sep 2026, 17:36 UTC

    the Type confusion vulnerability (CVE-2026-85046), then combines a separate WebAssembly defect to escape the V8 sandbox ( CVE-2026-87491 ). It then exploits a third vulnerability in the Windows kernel ( CVE-2026-85880 ) to escape Chrome’s sandboxed renderer process and inject code into the Chrome

    Earliest mention we hold (a vetted outlet).

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    Research: volexity research
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    sha256:67e4b8f33d82c4b8…
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  2. Vendor statement

    at disclosureUnverified: quote not found in the archived copy

    Google advisory chrome-2312771101612558943/CVE-2026-87491ClaimedQuote not found in archive

    The Chrome team is delighted to announce the promotion of Chrome 153 to the stable channel for Windows, Mac and Linux.

    From the advisory's revision history.

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    1 more source for this moment
    Google advisory chrome-2312771101612558943/CVE-2026-87491ClaimedQuote verified8 Sep 2026, 21:24 UTC

    The Chrome team is delighted to announce the promotion of Chrome 153 to the stable channel for Windows, Mac and Linux. This will roll out over the coming days/weeks. Chrome 153.0.8010.36 (Linux)

    Recorded time
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    Claimed. The date the source gives.
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    Found in the archived copy
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    sha256:b805fef4ef6d01e2…
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    No, kept for the record
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  3. First workaround

    No official mitigation found yet.

  4. First fix

    at disclosureUnverified: quote not found in the archived copy

    Google advisory chrome-2312771101612558943/CVE-2026-87491ClaimedQuote not found in archive

    The Chrome team is delighted to announce the promotion of Chrome 153 to the stable channel for Windows, Mac and Linux.

    Stable Channel Update for Desktop: build fixing the listed CVEs (one candidate per channel/platform)

    Recorded time
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    To the minute
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    Claimed. The date the source gives.
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    Not found in the archived copy. Treat with caution.
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    sha256:5786fecfe0bf3cf0…
    Used in metrics
    Yes
    Dispute this timestamp
    1 more source for this moment
    Google advisory chrome-2312771101612558943/CVE-2026-87491Inferred8 Sep 2026, 21:24 UTC

    The Chrome team is delighted to announce the promotion of Chrome 153 to the stable channel for Windows, Mac and Linux. This will roll out over the coming days/weeks. Chrome 153.0.8010.36 (Linux)

    Patch-day rule: Google ships fixes in the advisory that discloses a bug, and this advisory states that fixed versions exist. So the vendor statement, first fix and fix for all versions all take the advisory's publication time.

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    sha256:b805fef4ef6d01e2…
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  5. Fixed for all versions

    +<1hUnverified: derived by rule, not read from a source

    Google advisory chrome-2312771101612558943/CVE-2026-87491Inferred

    The Chrome team is delighted to announce the promotion of Chrome 153 to the stable channel for Windows, Mac and Linux. This will roll out over the coming days/weeks. Chrome 153.0.8010.36 (Linux)

    Patch-day rule: Google ships fixes in the advisory that discloses a bug, and this advisory states that fixed versions exist. So the vendor statement, first fix and fix for all versions all take the advisory's publication time.

    Recorded time
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    To the minute
    Origin
    Inferred. Derived by a documented rule.
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    Found in the archived copy
    Snapshot
    sha256:b805fef4ef6d01e2…
    Used in metrics
    Yes
    Dispute this timestamp

Send this to your boss

No brief for this incident yet. We write one for every open incident and every critical bug exploited before a fix.

Affected products

  • Chromium V8
  • Chrome

Related

Google report card