Patch Forecast
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CVE-2026-121187

Observable discrepancy in Paint in Google Chrome prior to 157.0.8103.38 allowed a remote attacker…

Risk score
40/100
CVSS
5.3 v3.1
Exploit chance (30 days)
0.3%
Published
3 Nov 2026

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What to know

What it is
Observable discrepancy in Paint in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to obtain sensitive information via a crafted HTML page. (Chromium security severity: Medium)
Affected
Chrome before 157.0.8103.38
Fix
Upgrade Chrome to 157.0.8103.38 or later.
Exploitation
Public proof of concept

Story map

Story map: ChromeTHE FLAWSTHE FIXCVE-2026-121187Observable discrepancy in Paintin Google Chrome prior to157.0.8103.38 allowed a…CVSS 5.3 · EPSS 0%CVE-2026-110136Use-after-free can lead toremote code executionCVSS 9.6 · EPSS 0%CVE-2026-106329Incorrect authorisation canlead to remote code executionCVSS 9.6 · EPSS 0%CVE-2026-106417Integer overflow can lead toremote code executionCVSS 9.6 · EPSS 0%Upgrade Chrome157.0.8103.38 · 155.0.8059.79 ·155.0.8059.39or later on your release lineWho is exposedChrome before 155.0.8059.79AMBER · PATCH THIS WEEKChromeUse after free in PDF in GoogleChrome prior to 155.0.8059.79allowed a remote attacker toexecute arbitrary code outsidethe sandbox via a crafted HTMLpage. (Chromium securityseverity: Critical)Where it standsPublic proof of conceptHOW IT UNFOLDEDOfficial record on the left, the press on the right, oldest first.16 Oct · Microsoft Security Response CenterChromium CVE-2026-110136: Use after free16 Oct · Microsoft Security Response CenterChromium CVE-2026-106329: Incorrectauthorization16 Oct · Microsoft Security Response CenterChromium CVE-2026-106417: Integer overflowCONNECTS TOSame weaknessCWE-203 (CWE-203)26 other warnings in 30 days →Same productEarlier Chrome warnings397 in the last 90 days →
Story map: the flaws, the fix, how it unfolded and what it connects to. Boxes link to the record or article.

At a glance

Chrome: Amber, patch this week. Use after free in PDF in Google Chrome prior to 155.0.8059.79 allowed a remote attacker to execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Critical)

The flaws

  • CVE-2026-121187: Observable discrepancy in Paint in Google Chrome prior to 157.0.8103.38 allowed a remote attacker… (CVSS 5.3 · EPSS 0%)
  • CVE-2026-110136: Use-after-free can lead to remote code execution (CVSS 9.6 · EPSS 0%)
  • CVE-2026-106329: Incorrect authorisation can lead to remote code execution (CVSS 9.6 · EPSS 0%)
  • CVE-2026-106417: Integer overflow can lead to remote code execution (CVSS 9.6 · EPSS 0%)

The fix

Upgrade Chrome: 157.0.8103.38 · 155.0.8059.79 · 155.0.8059.39 or later on your release line

Who is exposed: Chrome before 155.0.8059.79

Where it stands

  • Public proof of concept

How it unfolded

  1. 16 Oct, Microsoft Security Response Center (official): Chromium CVE-2026-110136: Use after free
  2. 16 Oct, Microsoft Security Response Center (official): Chromium CVE-2026-106329: Incorrect authorization
  3. 16 Oct, Microsoft Security Response Center (official): Chromium CVE-2026-106417: Integer overflow

Connects to

Why it is Yellow

  • CVSS 5.3 medium
  • Public exploit or proof of concept referenced

References

Original description

Observable discrepancy in Paint in Google Chrome prior to 157.0.8103.38 allowed a remote attacker to obtain sensitive information via a crafted HTML page. (Chromium security severity: Medium)

Last activity 3 Nov 2026. Patch Forecast updates every hour.