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CVE-2023-4863

Out-of-bounds Write: Is CVE-2023-4863 real, exploitable, or a false positive? Here's the community verdict.

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signals

public sources

Exploited in wild
Yes
CISA KEV · Sep 13, 2023
Public exploit
PoC (unverified)
Metasploit/EDB/PoC
Base severity
8.8 High
CVSS
Exploitation prob.
100%
FIRST EPSS
Weakness
CWE-787 · Out-of-bounds Write
CWE

Confirmed exploited in the wild. Patch this first, regardless of the base score.

cisa ssvc

CISA Vulnrichment · assessed

Exploitation
Active
in the wild
Automatable
No
at scale
Technical impact
Total
on success

CISA decision, by how critical the affected system is to you:

  • low impact → Track
  • medium impact → Attend
  • high impact → Act

Track: normal patch cycle · Track*: watch closely · Attend: patch sooner · Act: patch now. About SSVC ↗

public exploits

links to sources — we don’t host code
GitHub PoC(6)unverified

Unverified proof-of-concept code has been published. It may or may not be functional — assess before relying on it.

affected packages

GHSA-j7hp-h8jx-5ppr · GitHub rates it high
  • crates.iolibwebp-sys2
    Vulnerable
    < 0.1.8
    Fixed in
    0.1.8
  • crates.iolibwebp-sys
    Vulnerable
    < 0.9.3
    Fixed in
    0.9.3
  • npmelectron
    Vulnerable
    ≥ 22.0.0, < 22.3.24; ≥ 24.0.0, < 24.8.3; ≥ 25.0.0, < 25.8.1; ≥ 26.0.0, < 26.2.1; ≥ 27.0.0-beta.1, < 27.0.0-beta.2
    Fixed in
    22.3.24, 24.8.3, 25.8.1, 26.2.1, 27.0.0-beta.2
  • NuGetSkiaSharp
    Vulnerable
    ≥ 2.0.0, < 2.88.6
    Fixed in
    2.88.6
  • Gogithub.com/chai2010/webp
    Vulnerable
    ≥ 1.1.2, < 1.4.0; < 0.0.0-20250406010349-76805d5a8860; ≥ 0.0.0, < 1.1.2-0.20250406010349-76805d5a8860
    Fixed in
    1.4.0, 0.0.0-20250406010349-76805d5a8860, 1.1.2-0.20250406010349-76805d5a8860
  • PyPIpillow
    Vulnerable
    < 10.0.1
    Fixed in
    10.0.1
7 more packages
  • crates.iowebp
    Vulnerable
    < 0.2.6
    Fixed in
    0.2.6
  • NuGetmagick.net-q16-anycpu
    Vulnerable
    < 13.3.0
    Fixed in
    13.3.0
  • NuGetmagick.net-q16-hdri-anycpu
    Vulnerable
    < 13.3.0
    Fixed in
    13.3.0
  • NuGetmagick.net-q16-x64
    Vulnerable
    < 13.3.0
    Fixed in
    13.3.0
  • NuGetmagick.net-q8-anycpu
    Vulnerable
    < 13.3.0
    Fixed in
    13.3.0
  • NuGetmagick.net-q8-openmp-x64
    Vulnerable
    < 13.3.0
    Fixed in
    13.3.0
  • NuGetmagick.net-q8-x64
    Vulnerable
    < 13.3.0
    Fixed in
    13.3.0

Source: GitHub Advisory Database (CC-BY 4.0), via OSV.dev. Check your lockfile version against the ranges above.

baseline read

auto · not a community verdict

Real — exploited in the wild

CISA confirms active exploitation. Treat scanner hits as true positives unless your specific version or config is unaffected.

Based on CISA KEV

Confirm or dispute →
Affected:GoogleFedoraprojectDebianMozillaMicrosoftWebmprojectNetappBentley

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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)

References

NVD MITRE CVE.org CISA KEV VulnCheck KEV

Published · Added to CISA KEV (1 day after publication)

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timeline

  1. CISA SSVC assessment · exploitation: active
  2. Added to CISA KEV · confirmed exploited in the wild
  3. Published by NVD
  4. Added to VulnCheck KEV · reported exploited in the wild

Score and exploit changes tracked since .

Community ground truth

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In your experience, is this finding real and exploitable?

awaiting field verdicts
Real, but not a risk here
Not a real issue

Curated baseline: TruePositive's read from public sources is Real & exploitable — a starting point, not a community verdict.

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Field notes & remediation

Verdicts are the quick signal. Notes are the evidence and fixes behind them.

  • 0
    Field note · TruePositive EditorialCurated

    Google Chromium WebP Heap-Based Buffer Overflow Vulnerability — 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. Listed in the CISA KEV catalog (added 2023-09-13) — confirmed exploited in the wild, not theoretical. FIRST EPSS puts the chance of exploitation in the next 30 days at ~100%. Treat it as real and prioritize remediation over triage.

  • 0
    Remediation · TruePositive EditorialCurated

    Required action for Google Chromium WebP: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. CISA set a federal remediation due date of 2023-10-04. After patching, verify the vulnerable path is no longer reachable before closing the finding.

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Related CVEs

Same weakness: CWE-787 · Out-of-bounds Write.