CVE-2026-87491
Exploitation confirmed. First attested on 2026-09-09 by CISA-ADP, CISA KEV, GCVE · previdian.
- Published2026-09-09
- Fixed in153.0.8010.36
- WeaknessCWE-787
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
Out of bounds write in V8 in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to execute arbitrary code inside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
Timeline
dates in UTCObserved activity
isMalicious corpus · updated 2026-10-27 15:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-87491?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-87491?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 153.0 | < 153.0.8010.36 | 153.0.8010.36 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Vendor advisories
- CVE-2026-87491 Red Hat Product Security
chromium-browser: chromium-browser: Out of bounds write in V8
Fix
- Update Google chrome to 153.0.8010.36
- CISA’s required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.due 2026-09-23
Advisories and patches
- chromereleases.googleblog.comRelease Notes · Vendor Advisory
Detection
read 2026-10-27 00:21 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- 1 repository, unverifiedSneakyNachos/CVE-2026-87491-and-CVE-2026-85046-the-bagel-fell-off-the-counter PoC-in-GitHub
CISA Known Exploited Vulnerability
- Date Added
- 2026-09-09
- Patch Due Date
- 2026-09-23
- Ransomware Use
- Unknown
- Required Action
- Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Sources
- NVDCVE recordread 2026-10-23
- CISA KEVKEV entry2026-09-09
- GCVEexploitation2026-09-09
- CISA-ADPSSVC decisionactive2026-09-10
- OpenCVESSVC decisionactive—
- CISA-ADPCVSS 3.18.82026-09-09
- CNAweakness (CWE)CWE-787read 2026-10-23
- FIRST EPSSEPSS score3.5 %2026-10-26
- PoC-in-GitHubproof of concept1read 2026-10-27
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Published
- 2026-09-09
- Last Modified
- 2026-09-21
- NVD status
- Analyzed
Frequently asked questions
What is CVE-2026-87491?
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What is the CVSS score for CVE-2026-87491?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.