CVE-2026-117880
published 2026-10-27CVE-2026-117880: Use-after-free in the XML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
PriorityP427high7.5
EPSS
0.19%
8.3th percentile
Use-after-free in the XML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
Affected
7 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 159 | Firefox 159 |
| mozilla | firefox | — | — |
| mozilla | firefox_esr | < Firefox ESR 115.44 | Firefox ESR 115.44 |
| mozilla | firefox_esr | < Firefox ESR 153.6 | Firefox ESR 153.6 |
| mozilla | thunderbird | < Thunderbird 159 | Thunderbird 159 |
| mozilla | thunderbird | < Thunderbird 153.6 | Thunderbird 153.6 |
| rhel10 | firefox-flatpak | — | — |
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Red Hat
firefox: Use-after-free in the XML component
vendor_redhat·2026-10-27·CVSS 7.5
CVE-2026-117880 [HIGH] CWE-825 firefox: Use-after-free in the XML component
firefox: Use-after-free in the XML component
Use-after-free in the XML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, Firefox ESR 153.6, Thunderbird 159, and Thunderbird 153.6.
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
Use-after-free in the XML component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: firefox (Red Hat Enterprise Linux 6) - Out of support scope
Package: firefox (Red Hat Enterprise Linux 7) - Affected
Package: firefox (Red Hat Enterprise Linux 8) - Affected
Packa
Mozilla
Mozilla Foundation Security Advisory 2026-119: CVE-2026-117880
vendor_mozilla
CVE-2026-117880 Mozilla Foundation Security Advisory 2026-119: CVE-2026-117880
Mozilla Foundation Security Advisory 2026-119
CVE: CVE-2026-117880
Product: Firefox ESR
Impact: low
Fixed in: Firefox ESR 115.44
Mozilla
Mozilla Foundation Security Advisory 2026-118: CVE-2026-117880
vendor_mozilla
CVE-2026-117880 Mozilla Foundation Security Advisory 2026-118: CVE-2026-117880
Mozilla Foundation Security Advisory 2026-118
CVE: CVE-2026-117880
Product: Firefox
Impact: low
Fixed in: Firefox 159
Mozilla
Mozilla Foundation Security Advisory 2026-121: CVE-2026-117880
vendor_mozilla
CVE-2026-117880 Mozilla Foundation Security Advisory 2026-121: CVE-2026-117880
Mozilla Foundation Security Advisory 2026-121
CVE: CVE-2026-117880
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 159
Mozilla
Mozilla Foundation Security Advisory 2026-120: CVE-2026-117880
vendor_mozilla
CVE-2026-117880 Mozilla Foundation Security Advisory 2026-120: CVE-2026-117880
Mozilla Foundation Security Advisory 2026-120
CVE: CVE-2026-117880
Product: Firefox ESR
Impact: low
Fixed in: Firefox ESR 153.6
Mozilla
Mozilla Foundation Security Advisory 2026-122: CVE-2026-117880
vendor_mozilla
CVE-2026-117880 Mozilla Foundation Security Advisory 2026-122: CVE-2026-117880
Mozilla Foundation Security Advisory 2026-122
CVE: CVE-2026-117880
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 153.6
VulDB
Mozilla Firefox up to 115.43/153.5/158 XML use after free (Nessus ID 373648)
vuldb·2026-10-30
CVE-2026-117880 [CRITICAL] Mozilla Firefox up to 115.43/153.5/158 XML use after free (Nessus ID 373648)
A vulnerability was found in Mozilla Firefox up to 115.43/153.5/158. It has been rated as critical. Impacted is an unknown function of the component XML. Performing a manipulation results in use after free.
This vulnerability is known as CVE-2026-117880. Remote exploitation of the attack is possible. No exploit is available.
Upgrading the affected component is advised.
GHSA
Use-after-free in the XML component.
ghsa_unreviewed·2026-10-27
CVE-2026-117880 Use-after-free in the XML component.
Use-after-free in the XML component. This vulnerability was fixed in Firefox 159, Firefox ESR 115.44, and Firefox ESR 153.6.
No detection rules found.
No public exploits indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=2075996https://www.mozilla.org/security/advisories/mfsa2026-118/https://www.mozilla.org/security/advisories/mfsa2026-119/https://www.mozilla.org/security/advisories/mfsa2026-120/https://www.mozilla.org/security/advisories/mfsa2026-121/https://www.mozilla.org/security/advisories/mfsa2026-122/
2026-10-27
Published