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Vulnerabilities

Vulnerability · CVE-2023-4863

Google Chromium WebP Heap-Based Buffer Overflow Vulnerability

Published Sep 6, 2023 · catalog updated Jun 16, 2026 · Google Chromium WebP

Patch now

CVE-2023-4863 is in the CISA known-exploited catalog, due Oct 4, 2023. Confirm Google Chromium WebP against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
High8.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
99.98%
Remediation
Remediation guidance
Affected products
cpe bentley/seequent leapfrog · cpe debian/debian linux · cpe fedoraproject/fedora · cpe google/chrome · cpe microsoft/edge chromium · cpe mozilla/firefox

Google Chromium WebP contains a heap-based buffer overflow vulnerability that allows a remote attacker to perform an out-of-bounds memory write via a crafted HTML page. This vulnerability can affect applications that use the WebP Codec.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe bentley/seequent leapfrogversion unspecified
  • cpe debian/debian linux10.0
  • cpe debian/debian linux11.0
  • cpe debian/debian linux12.0
  • cpe fedoraproject/fedora37
  • cpe fedoraproject/fedora38
  • cpe fedoraproject/fedora39
  • cpe google/chromeversion unspecified
  • cpe microsoft/edge chromiumversion unspecified
  • cpe mozilla/firefoxversion unspecified
  • cpe netapp/active iq unified managerversion unspecified
  • cpe webmproject/libwebpversion unspecified
  • vendor Google Chromium WebPversion unspecified

How to fix CVE-2023-4863

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2023-4863 is in the CISA known-exploited catalog, due Oct 4, 2023. Confirm Google Chromium WebP against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with debian/debian linux 10.0; debian/debian linux 11.0; debian/debian linux 12.0. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

What should an analyst verify?

CWE-787: Out-of-bounds Write. EPSS 99.98%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 12, 2023 · Catalog

    Detected

    Google Chromium WebP contains a heap-based buffer overflow vulnerability that allows a remote attacker to perform an out-of-bounds memory write via a crafted HTML page. This vulnerability can affect applications that use the WebP Codec.

  2. Sep 13, 2023 · CISA KEV

    Known exploited

    Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

  3. Oct 4, 2023 · CISA KEV

    Remediation due

    Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

  4. Jun 16, 2026 · Catalog

    Updated

    Google Chromium WebP contains a heap-based buffer overflow vulnerability that allows a remote attacker to perform an out-of-bounds memory write via a crafted HTML page. This vulnerability can affect applications that use the WebP Codec.

Sources

  • CISA KEVConfirmed exploitationCVE-2023-4863

    Google Chromium WebP contains a heap-based buffer overflow vulnerability that allows a remote attacker to perform an out-of-bounds memory write via a crafted HTML page. This vulnerability can affect applications that use the WebP Codec.

    cisa.gov
  • CVE.orgVulnerability recordCVE-2023-4863

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2023-4863

    30-day exploitation probability 100.0%

    first.org
  • NIST NVDVulnerability recordCVE-2023-4863

    Heap buffer overflow in libwebp in Google Chrome prior to 116.0.5845.187 and libwebp 1.3.2 allowed a remote attacker to perform an out of bounds memory write via a crafted HTML page. (Chromium security severity: Critical)

    nvd.nist.gov
  • VulnCheck KEVConfirmed exploitationCVE-2023-4863

    Google Chromium WebP contains a heap-based buffer overflow vulnerability that allows a remote attacker to perform an out-of-bounds memory write via a crafted HTML page. This vulnerability can affect applications that use the WebP Codec.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.