VDB
CVE-2026-109707
CVE-2026-109707
PUBLISHED
CVSS 9.6 CRITICAL
Sandbox escape due to use-after-free in the Networking component
Reported by mozilla · Published October 13, 2026
Sandbox escape due to use-after-free in the Networking component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, Thunderbird 153.5, and Firefox ESR 115.44.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| firefox-debuginfo | errata.rockylinux.org | 0:153.5.0-1.el9_8.x86_64, 0:153.5.0-1.el9_8.s390x, 0:153.5.0-1.el9_8.ppc64le, 0:153.5.0-1.el9_8.aarch64, 0:153.5.0-1.el8_10.x86_64, 0:153.5.0-1.el8_10.aarch64, 0:153.5.0-1.el10_2.x86_64, 0:153.5.0-1.el10_2.s390x, 0:153.5.0-1.el10_2.ppc64le, 0:153.5.0-1.el10_2.aarch64 |
| firefox-x11 | errata.rockylinux.org | 0:153.5.0-1.el9_8.x86_64, 0:153.5.0-1.el9_8.s390x, 0:153.5.0-1.el9_8.ppc64le, 0:153.5.0-1.el9_8.aarch64 |
| firefox | Amazon Linux | 153.5.0-1.amzn2023.0.1 |
| firefox-debugsource | errata.rockylinux.org | 0:153.5.0-1.el9_8.x86_64, 0:153.5.0-1.el9_8.s390x, 0:153.5.0-1.el9_8.ppc64le, 0:153.5.0-1.el9_8.aarch64, 0:153.5.0-1.el8_10.x86_64, 0:153.5.0-1.el8_10.aarch64, 0:153.5.0-1.el10_2.x86_64, 0:153.5.0-1.el10_2.s390x, 0:153.5.0-1.el10_2.ppc64le, 0:153.5.0-1.el10_2.aarch64 |
| firefox-esr-140 | Chainguard | 140.17.0-r2 |
| firefox | errata.rockylinux.org | 0:153.5.0-1.el9_8.x86_64, 0:153.5.0-1.el9_8.src, 0:153.5.0-1.el9_8.s390x, 0:153.5.0-1.el9_8.ppc64le, 0:153.5.0-1.el9_8.aarch64, 0:153.5.0-1.el8_10.x86_64, 0:153.5.0-1.el8_10.src, 0:153.5.0-1.el8_10.aarch64, 0:153.5.0-1.el10_2.x86_64, 0:153.5.0-1.el10_2.src, 0:153.5.0-1.el10_2.s390x, 0:153.5.0-1.el10_2.ppc64le, 0:153.5.0-1.el10_2.aarch64 |
| thunderbird-debugsource | errata.rockylinux.org | 0:153.5.0-1.el9_8.x86_64, 0:153.5.0-1.el9_8.s390x, 0:153.5.0-1.el9_8.ppc64le, 0:153.5.0-1.el9_8.aarch64 |
| thunderbird | errata.rockylinux.org | 0:153.5.0-1.el9_8.x86_64, 0:153.5.0-1.el9_8.src, 0:153.5.0-1.el9_8.s390x, 0:153.5.0-1.el9_8.ppc64le, 0:153.5.0-1.el9_8.aarch64 |
| thunderbird-debuginfo | errata.rockylinux.org | 0:153.5.0-1.el9_8.x86_64, 0:153.5.0-1.el9_8.s390x, 0:153.5.0-1.el9_8.ppc64le, 0:153.5.0-1.el9_8.aarch64 |
Risk scores
CVSS 3.1
9.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | 115.44, 153.5, 158 |
| Mozilla | Thunderbird | 153.5, 158 |
| amazon:2023 | firefox | 0 |
| chainguard | firefox-esr-140 | 0 |
| Mozilla | Firefox | 153.5, 158, 115.44 |
| Mozilla | Thunderbird | 158, 153.5 |
Timeline
- Oct 13, 2026 CVE Published
- Oct 14, 2026 EPSS Score (7 in total, the first dated here)
- Oct 27, 2026 CVE Updated
- Nov 4, 2026 Distribution Patch (4 in total, the first dated here)
- Nov 4, 2026 Security Advisory
Query this with the API
The same record, from the CLI:
vulnetix vdb vuln CVE-2026-109707
vulnetix vdb fixes CVE-2026-109707Or with curl, using the org id and key from your account page:
curl -s -H "Authorization: ApiKey ${VULNETIX_ORG_ID}:${VULNETIX_API_KEY}" \
"https://api.vdb.vulnetix.com/v2/vuln/CVE-2026-109707/fixes/registry"The Community plan is free and allows 50 queries a day. Get a free API key · API quickstart