Описание
libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.
A flaw was found in libexpat. The library's handling of custom encoding callbacks lacks proper tracking of handler call depth, which can lead to a use-after-free vulnerability. This memory corruption flaw could allow a local attacker to cause a denial of service or potentially execute arbitrary code.
Отчет
Red Hat ships libexpat (packaged as "expat") across many products. All versions of expat prior to 2.8.4 are affected by this use-after-free vulnerability. Exploitation requires triggering the vulnerable code path through custom encoding callbacks, which is not a common usage pattern.
Меры по смягчению последствий
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Затронутые пакеты
| Платформа | Пакет | Состояние | Рекомендация | Релиз |
|---|---|---|---|---|
| Red Hat Enterprise Linux 10 | expat | Fix deferred | ||
| Red Hat Enterprise Linux 10 | firefox | Fix deferred | ||
| Red Hat Enterprise Linux 10 | thunderbird | Fix deferred | ||
| Red Hat Enterprise Linux 6 | compat-expat1 | Fix deferred | ||
| Red Hat Enterprise Linux 6 | expat | Fix deferred | ||
| Red Hat Enterprise Linux 7 | expat | Fix deferred | ||
| Red Hat Enterprise Linux 7 | firefox | Fix deferred | ||
| Red Hat Enterprise Linux 8 | expat | Fix deferred | ||
| Red Hat Enterprise Linux 8 | firefox | Fix deferred | ||
| Red Hat Enterprise Linux 8 | mingw-expat | Fix deferred |
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Дополнительная информация
Статус:
EPSS
4.9 Medium
CVSS3
Связанные уязвимости
libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.
libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.
libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.
libexpat before 2.8.4 lacks handler call depth tracking with custom en ...
libexpat before 2.8.4 lacks handler call depth tracking with custom encoding callbacks. Thus, a use-after-free can occur. NOTE: this is similar to CVE-2026-50219, CVE-2026-56131 and CVE-2026-56412.
EPSS
4.9 Medium
CVSS3