Red Hat Security Advisory: firefox security update
Red Hat has issued a security advisory for Mozilla Firefox addressing two vulnerabilities involving out-of-bounds access: one when resolving Promise objects (CVE-2025-4918) and another when optimizing linear sums (CVE-2025-4919). These vulnerabilities affect Red Hat Enterprise Linux 9 and its extended update and life cycle support variants across multiple architectures. The update is rated as Important by Red Hat Product Security. A security update is available to remediate these issues.
AI Analysis
Technical Summary
This advisory covers two out-of-bounds access vulnerabilities in Mozilla Firefox as packaged by Red Hat for Red Hat Enterprise Linux 9. The first vulnerability (CVE-2025-4918) occurs during the resolution of Promise objects, and the second (CVE-2025-4919) occurs when optimizing linear sums. Both issues could lead to memory safety violations. Red Hat has released updated Firefox packages to address these vulnerabilities across multiple supported architectures and variants of RHEL 9.
Potential Impact
The vulnerabilities involve out-of-bounds memory access, which can lead to memory corruption and potentially allow an attacker to cause a denial of service or execute arbitrary code. Red Hat rates the security impact as Important, indicating a high severity level but not critical. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released updated Firefox packages for Red Hat Enterprise Linux 9 and its extended update and life cycle support variants. Users should apply the provided security update as detailed in Red Hat advisory RHSA-2025:8049 and the referenced update article (https://access.redhat.com/articles/11258) to remediate these vulnerabilities. No additional mitigation steps are indicated by the vendor.
Red Hat Security Advisory: firefox security update
Description
Red Hat has issued a security advisory for Mozilla Firefox addressing two vulnerabilities involving out-of-bounds access: one when resolving Promise objects (CVE-2025-4918) and another when optimizing linear sums (CVE-2025-4919). These vulnerabilities affect Red Hat Enterprise Linux 9 and its extended update and life cycle support variants across multiple architectures. The update is rated as Important by Red Hat Product Security. A security update is available to remediate these issues.
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This advisory covers two out-of-bounds access vulnerabilities in Mozilla Firefox as packaged by Red Hat for Red Hat Enterprise Linux 9. The first vulnerability (CVE-2025-4918) occurs during the resolution of Promise objects, and the second (CVE-2025-4919) occurs when optimizing linear sums. Both issues could lead to memory safety violations. Red Hat has released updated Firefox packages to address these vulnerabilities across multiple supported architectures and variants of RHEL 9.
Potential Impact
The vulnerabilities involve out-of-bounds memory access, which can lead to memory corruption and potentially allow an attacker to cause a denial of service or execute arbitrary code. Red Hat rates the security impact as Important, indicating a high severity level but not critical. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Red Hat has released updated Firefox packages for Red Hat Enterprise Linux 9 and its extended update and life cycle support variants. Users should apply the provided security update as detailed in Red Hat advisory RHSA-2025:8049 and the referenced update article (https://access.redhat.com/articles/11258) to remediate these vulnerabilities. No additional mitigation steps are indicated by the vendor.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2025:8049
- Cve Count
- 2
- Additional Cves
- ["CVE-2025-4919"]
Threat ID: 6a4049e727e9c79719834c02
Added to database: 06/27/2026, 22:08:39 UTC
Last enriched: 06/27/2026, 22:35:19 UTC
Last updated: 09/10/2026, 19:36:50 UTC
Views: 20
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