Red Hat Security Advisory: firefox security update
Affects Red HatSource GCVE Database
Mentioned vulnerabilities
Not known to be exploited.
Data as of 25 Oct 2026, 19:02 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- EPSS
- 9.5% chance of exploitation in 30 days – higher than 95% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 2 Jun 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-25.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Red Hat Product Security Red Hat | Affected
| Fixed in– |
AI-suggested
Red Hat has released an official security update for Firefox that addresses these vulnerabilities. Users of Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions should apply the Firefox update version 128.10.1-1.el9_0 or later as provided by Red Hat to remediate these issues. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigation actions are specified or required beyond applying the official update.
Description
Red Hat has issued a security advisory for Mozilla Firefox addressing two vulnerabilities involving out-of-bounds access in Firefox and Thunderbird. These vulnerabilities are identified as CVE-2025-4918 and CVE-2025-4919 and relate to resolving Promise objects and optimizing linear sums, respectively. The vulnerabilities are rated with an important security impact by Red Hat. Updates are available for Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions across multiple architectures including x86_64, ppc64le, aarch64, and s390x. Users are advised to apply the provided security update to remediate these issues.
References
- access.redhat.com/errata/RHSA-2025:8371 (opens in a new tab)
- access.redhat.com/security/updates/classification/ (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2367016 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2367018 (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_8371.json (opens in a new tab)