High [CVE-2026-111497] Out-of-Bounds Write in Google Brotli Decoder
This high-severity Red Hat Linux advisory covers CVE-2026-111497; related products: Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 10.
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Summary
Out-of-Bounds Write in Google Brotli Decoder. Red Hat rates this important (CVSS 8.1).
Weakness: CWE-787. Red Hat lists fixing advisory RHSA-2026:10757 with package thunderbird-0:140.10.0-1.el8_10, brotli-0:1.0.9-10.el9_8.1, firefox-0:140.10.0-1.el10_1, firefox-0:140.10.0-1.el10_0.
Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 10.
CISA Known Exploited Vulnerability
- Listed:
- Oct 27, 2026 · federal remediation due Nov 10, 2026
- 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.
KEV is a prioritization signal from CISA. Remediation detail comes from the vendor advisory.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
- thunderbird-0:140.10.0-1.el8_10
- brotli-0:1.0.9-10.el9_8.1
- firefox-0:140.10.0-1.el10_1
- firefox-0:140.10.0-1.el10_0
- brotli-0:1.1.0-8.el10_2.1
- brotli-0:1.0.6-5.el8_10
- thunderbird-0:140.10.0-1.el8_4
- firefox-0:140.10.0-1.el9_0
- thunderbird-0:140.10.0-1.el9_2
- firefox-0:140.10.0-1.el9_2
- firefox-0:140.10.0-1.el8_4
- thunderbird-0:140.10.0-1.el9_0
- firefox-0:140.10.0-1.el9_4
- firefox-0:140.10.0-1.el8_6
- firefox-0:140.10.0-1.el9_6
- brotli-main-1.2.1-0.1.hum1
- firefox-0:140.10.0-1.el8_8
- firefox-0:140.10.0-1.el9_7
- firefox-0:140.10.0-1.el8_10
- thunderbird-0:140.10.0-1.el8_8
- RHSA-2026:10757
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
Mitigation checklist
- Limit exposure of services that decompress Brotli from untrusted peers, and restrict network access to those services where practical. Prefer not accepting or auto-decoding Content-Encoding: br from untrusted sources when the application allows that configuration.
Official advisory · high-confidence parse· fetched 5 days ago·verify at source
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