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PatchSiren cyber security CVE debrief

CVE-2023-4863 Google CVE debrief

CVE-2023-4863 is a Google Chromium WebP heap-based buffer overflow vulnerability that CISA added to its Known Exploited Vulnerabilities catalog on 2023-09-13. Because it is on the KEV list, defenders should treat remediation as urgent and follow vendor guidance for affected Chromium/WebP deployments.

Vendor
Google
Product
Chromium WebP
CVSS
HIGH 7.5
CISA KEV
Listed
Original CVE published
2023-09-13
Original CVE updated
2026-09-27
Advisory published
2026-09-27
Advisory updated
2026-09-27

Who should care

Browser and desktop patch-management teams, security operations teams, and administrators responsible for Chromium-based browsers or other software that depends on Chromium WebP handling.

Technical summary

The vulnerability is described as a heap-based buffer overflow in Chromium WebP handling. CISA’s KEV entry identifies it as actively exploited and directs defenders to apply vendor mitigations or discontinue use if mitigations are unavailable.

Defensive priority

Critical / immediate

Recommended defensive actions

  • Apply the relevant Google/Chromium security update as soon as possible.
  • Verify all Chromium-based browser installations and managed endpoints are on remediated versions.
  • Use only vendor-provided mitigation or upgrade guidance for affected deployments.
  • If no mitigation is available for a specific deployment, discontinue use per CISA KEV guidance.
  • Track remediation against the KEV due date of 2023-10-04 and treat any remaining exposure as overdue.

Evidence notes

This debrief is based only on the supplied CVE metadata and CISA KEV source item. The corpus identifies CVE-2023-4863 as a Google Chromium WebP heap-based buffer overflow, marks it as a KEV entry, and includes CISA’s required action text. The source item metadata also references the Google Chrome release note and the NVD record, but no additional advisory content was provided in the corpus.

Sources and references

Verified primary and authoritative sources

  • CVE-2023-4863 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2023-4863

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2023-4863 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2023-4863

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.