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 3 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 Hatredhat/firefoxpkg:rpm/redhat/firefoxOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Red Hat has released updated Firefox packages for Red Hat Enterprise Linux 7 Extended Lifecycle Support to address these vulnerabilities. Users should apply the provided security update (firefox-128.10.1-1.el7_9) as detailed in the Red Hat advisory RHSA-2025:8465 and the referenced update article (https://access.redhat.com/articles/11258). No additional mitigation steps are indicated by the vendor.
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 issues affect Red Hat Enterprise Linux 7 Extended Lifecycle Support versions. The vulnerabilities are rated as important by Red Hat Product Security. Updates are available to remediate these issues.
References
- access.redhat.com/errata/RHSA-2025:8465 (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_8465.json (opens in a new tab)