Red Hat Security Advisory: firefox security update
Affects Red HatSource GCVE Database
Mentioned vulnerabilities
Not known to be exploited : upgrade to 8.8.1 soon.
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.
- Patch
- Available – fixed in 8.8.1
Exploitation evidence
Disclosed: evidence found.
CVE published 11 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
Upgrade Red Hat to 8.8.1.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Red Hat Product Security Red Hat | Affected
| Fixed in
|
AI-suggested
Red Hat has released updated Firefox packages that address these vulnerabilities. Users of Red Hat Enterprise Linux 8.8 Extended Update Support and related products should apply the Firefox update version 128.10.1-1.el8_8 or later as provided by Red Hat. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigation actions are indicated by the vendor advisory.
Description
Two security vulnerabilities affecting Mozilla Firefox and Thunderbird involve out-of-bounds access errors: one when resolving Promise objects (CVE-2025-4918) and another when optimizing linear sums (CVE-2025-4919). These issues were addressed in a security update provided by Red Hat for their Enterprise Linux 8.8 Extended Update Support and related products. The update is rated as important by Red Hat Product Security. No CVSS score is provided in the advisory. The vulnerabilities relate to improper memory access (CWE-787).
References
- access.redhat.com/errata/RHSA-2025:8807 (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_8807.json (opens in a new tab)