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TI-2016-04559 Aliases CVE-2016-5261GHSA-jrqh-qj76-c265

Integer overflow in the WebSocketChannel class in the WebSockets subsystem in Mozilla…

Priority MEDIUM 45CWE-190Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-190 and the CVSS impact.

Summary

Integer overflow in the WebSocketChannel class in the WebSockets subsystem in Mozilla Firefox before 48.0 and Firefox ESR < 45.4 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via crafted packets that trigger incorrect buffer-resize operations during buffering.

Why it matters now

EPSS 0.04178 90th percentileScored 2026-11-07
Fix Fixed Red Hat: 1 advisory

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*up to 47.0.1VulnerableMozilla
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions up to 47.0.1 Vulnerable ·Mozilla

Remediation

Red Hat 1 advisory

  • RHSA-2016:1912 Released 2016-09-21 · Red Hat rating Critical
    firefox security update
    • Red Hat Enterprise Linux (v. 5 server) firefox-45.4.0-1.el5_11, firefox-45.4.0-1.el5_11.i386
    • Red Hat Enterprise Linux Client (v. 7) firefox-45.4.0-1.el7_2
    • Red Hat Enterprise Linux Client Optional (v. 7) firefox-45.4.0-1.el7_2
    • Red Hat Enterprise Linux Desktop (v. 5 client) firefox-45.4.0-1.el5_11, firefox-45.4.0-1.el5_11.i386
    • Red Hat Enterprise Linux Desktop (v. 6) firefox-45.4.0-1.el6_8
    • Red Hat Enterprise Linux Desktop Optional (v. 6) firefox-45.4.0-1.el6_8
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox-45.4.0-1.el6_8
    • Red Hat Enterprise Linux Server (v. 6) firefox-45.4.0-1.el6_8
    • Red Hat Enterprise Linux Server (v. 7) firefox-45.4.0-1.el7_2
    • Red Hat Enterprise Linux Server Optional (v. 6) firefox-45.4.0-1.el6_8, firefox-45.4.0-1.el6_8.ppc
    • Red Hat Enterprise Linux Server Optional (v. 7) firefox-45.4.0-1.el7_2, firefox-45.4.0-1.el7_2.ppc
    • Red Hat Enterprise Linux Workstation (v. 6) firefox-45.4.0-1.el6_8
    • Red Hat Enterprise Linux Workstation (v. 7) firefox-45.4.0-1.el7_2
    • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox-45.4.0-1.el6_8
    • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-45.4.0-1.el7_2

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux (v. 5 server)Fixed RHSA-2016:1912
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2016:1912
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2016:1912
Red Hat Enterprise Linux Desktop (v. 5 client)Fixed RHSA-2016:1912
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2016:1912
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2016:1912
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2016:1912
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2016:1912
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2016:1912
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2016:1912
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2016:1912
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2016:1912
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2016:1912
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2016:1912
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2016:1912
Not affected: 3 products
  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 7

Timeline

  1. 2026-10-02 Threatist record created from CVE-2016-5261
  2. 2026-10-03 Alias added: GHSA-jrqh-qj76-c265

References

Advisory 7

Other 3

  • TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
  • TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
  • TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
  • TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
  • TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences