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CVE-2025-4918VulnerabilityPublished Updated

Red Hat Security Advisory: firefox security update

Affects Red HatSource GCVE Database

0

Mentioned vulnerabilities

Not known to be exploited : upgrade to 9.2.1 soon.

Data as of 25 Oct 2026, 19:02 UTC

Severity
High

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 9.2.1

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 2 Jun 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 redhat/firefox to 9.2.1.

Affected software

ProductAffectedFixed in
Red Hatredhat/firefoxpkg:rpm/redhat/firefoxOther threatsAffected
  • <9.2.1 >=9.2
Fixed in
  • 9.2.1

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 that fix these vulnerabilities for Red Hat Enterprise Linux 9.2 Extended Update Support and related variants. Users should apply the provided security update as detailed in Red Hat advisory RHSA-2025:8369 and the referenced article https://access.redhat.com/articles/11258. No additional mitigation steps are indicated or required beyond applying the official update.

Description

Two security vulnerabilities (CVE-2025-4918 and CVE-2025-4919) affecting Mozilla Firefox and Thunderbird involve out-of-bounds access errors during Promise object resolution and linear sum optimization. These issues have been addressed in a security update released by Red Hat for Red Hat Enterprise Linux 9.2 Extended Update Support and related variants. The update is rated as Important by Red Hat Product Security. No CVSS score is provided in the advisory. The vulnerabilities relate to memory safety (CWE-787).

References

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