DEBIAN-CVE-2026-17544: php8.4 security update

DEBIAN-CVE-2026-17544, released August 1, 2026, fixes 1 CVE in php8.4. None of them is reported as exploited. Patch Radar priority: Urgent.

Urgent

CVEs closed

1 rated Critical

Exploited

None reported

Highest CVSS

9.8

Base score, 0 to 10

Highest EPSS

0.0042

36th percentile

Fixed package versions

Product	Release	Fixed in
php8.4	Debian 13.5 (trixie)	8.4.24-1~deb13u1
php8.4	Debian 14	8.4.24-1

CVEs this fix closes

Priority	CVE	Title	CVSS	EPSS	Exploitation
Urgent	CVE-2026-17544	php8.4: Attacker-provided inputs to bccomp() could lead to an out-of-bounds write with stack and heap corruption in PHP versi...	9.8	0.0042	None reported

Also fixes CVE-2026-17544

SUSE-SU-2026:3509-1
apache2-mod_php8, php8, php8-embed and 3 more on sles 15.7
OPENSUSE-SU-2026:21532-1
apache2-mod_php8, php8, php8-embed and 3 more on opensuse-leap 16.0
SUSE-SU-2026:23144-1
apache2-mod_php8, php8, php8-embed and 2 more on sles 16.0
ALSA-2026:56969
php8.4, php8.4-bcmath, php8.4-cli and 22 more on almalinux 10
ALAS2023-2026-2041
php8.5, php8.5-bcmath, php8.5-bcmath-debuginfo and 53 more on amzn 2023
ALAS2023-2026-2042
php8.4, php8.4-bcmath, php8.4-bcmath-debuginfo and 55 more on amzn 2023
libapache2-mod-php8.5 8.5.4-0ubuntu1.3
libapache2-mod-php8.5 on Ubuntu 26.04.1 LTS (resolute)
libphp8.5-embed 8.5.4-0ubuntu1.3
libphp8.5-embed on Ubuntu 26.04.1 LTS (resolute)

Vendor advisory

https://security-tracker.debian.org/tracker/CVE-2026-17544

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