CASCACascade Atlas

Evidence dossier

CVE-2023-4863

CVE-2023-4863

82.0–97.0Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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)

State
PUBLISHED
Published
Sep 12, 2023
Updated
Oct 21, 2025
Evidence coverage
85%
CISA KEVCatalog member

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

FIRST EPSS99.73%

2026-07-18 · v2026.06.15 · percentile 100.0%

Source stateNo scored conflict

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

Chromeoriginal assertion
container

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)

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

CISA KEVoriginal assertion
observed_exploitation

Google Chromium WebP Heap-Based Buffer Overflow Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.997350000000; percentile 0.999540000000

Applicability

Cited product scope

Trace impact →
GoogleChrome
[{"status": "affected", "version": "116.0.5845.187", "lessThan": "116.0.5845.187", "versionType": "custom"}]unknown
Googlelibwebp
[{"status": "affected", "version": "1.3.2", "lessThan": "1.3.2", "versionType": "custom"}]unknown
Unknown vendorUnknown product
cpe:2.3:a:bandisoft:honeyview:*:*:*:*:*:*:*:*; end excluding 5.51supported
Unknown vendorUnknown product
cpe:2.3:a:bentley:seequent_leapfrog:*:*:*:*:*:*:*:*; end excluding 2023.2supported
Unknown vendorUnknown product
cpe:2.3:a:google:chrome:*:*:*:*:*:*:*:*; end excluding 116.0.5845.187supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:edge_chromium:*:*:*:*:*:*:*:*; end excluding 116.0.1938.81supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:teams:*:*:*:*:desktop:*:*:*; end excluding 1.6.00.26474supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:teams:*:*:*:*:*:macos:*:*; end excluding 1.6.00.26463supported
Unknown vendorUnknown product
cpe:2.3:a:microsoft:webp_image_extension:*:*:*:*:*:*:*:*; end excluding 1.0.62681.0supported
Unknown vendorUnknown product
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*; end excluding 117.0.1supported
Unknown vendorUnknown product
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*; end excluding 102.15.1supported
Unknown vendorUnknown product
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*; start including 115.1.0; end excluding 115.2.1supported
Unknown vendorUnknown product
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*; end excluding 102.15.1supported
Unknown vendorUnknown product
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*; start including 115.0; end excluding 115.2.2supported
Unknown vendorUnknown product
cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*supported
Unknown vendorUnknown product
cpe:2.3:a:webmproject:libwebp:*:*:*:*:*:*:*:*; end excluding 1.3.2supported
Unknown vendorUnknown product
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*supported

Assessments

CVSS by origin

8.8
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8
134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8
CISA-ADPCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.