CVE-2026-17543: SQL injection in ext-pgsql via E'...' backslash breakout

High 8.1 EPSS 0.3% PHP

Improper escaping of backslashes in attacker-provided parameters would allow for trivial SQL injection in PHP versions from 8.2.* before 8.2.33, from 8.3.* before 8.3.33, from 8.4.* before 8.4.24, and from 8.5.* before 8.5.9.

CVE-2026-17543CVE identifier
8.1CVSS 4.0 base score (high)
0.3%EPSS: chance of exploitation in the next 30 days (higher than 26% of CVEs)
2026-07-30published

What do these terms mean? CVE · CVSS score · exploited (KEV) · EPSS · backported fix · all terms

What to do now

Check whether you run PHP and which version (commands below).
Install the fixed version for your system: see “Patch it” below.
sudo systemctl restart php8.4-fpm (Debian; php8.5-fpm on Ubuntu 26.04) or php-fpm (RHEL/Fedora/Arch/Amazon); restart apache2/httpd when mod_php is used

Affected and fixed versions

Affected:

PHP Group PHP 8.2.* to before 8.2.33
PHP Group PHP 8.3.* to before 8.3.33
PHP Group PHP 8.4.* to before 8.4.24
PHP Group PHP 8.5.* to before 8.5.9

Patch it

Use the commands for your system. Distribution packages often keep an older version number with the fix backported, so compare with the fixed package versions in the table below, not only with the upstream version.

Debian

sudo apt update
sudo apt install --only-upgrade php8.4-fpm php8.4-cli libapache2-mod-php8.4

Ubuntu

sudo apt update
sudo apt install --only-upgrade php8.5-fpm php8.5-cli libapache2-mod-php8.5

RHEL, AlmaLinux, Rocky, Oracle

sudo dnf upgrade --refresh php-fpm php-cli (RHEL 10 also php8.4-*)

Fedora

sudo dnf upgrade --refresh php-fpm php-cli

SUSE / openSUSE

sudo zypper refresh
sudo zypper update php8 php8-fpm

Amazon Linux

sudo dnf upgrade --releasever=latest php8.4 php8.4-fpm (or the installed php8.x)

Arch Linux

sudo pacman -Syu

Alpine

apk update && apk upgrade php84 php84-fpm (or php83/php85)

FreeBSD

pkg update && pkg upgrade php84 (or php83/php85)

General update steps for every system are on the Linux and Unix & BSD pages; after updating, see which services to restart.

Fix status in Linux distributions

Release	Package	Status	Fixed version / advisory
Debian 12	`php8.2`	fixed	`8.2.33-1~deb12u1`
Debian 13	`php8.4`	fixed	`8.4.24-1~deb13u1`
Debian testing	`php8.4`	fixed	`8.4.24-1`
Red Hat Enterprise Linux 9	`php:8.3-9080020260806131732.9`	fixed	`RHSA-2026:57539`
Red Hat Enterprise Linux 9	`php-0:8.0.30-8.el9_8`	fixed	`RHSA-2026:61259`
Red Hat Enterprise Linux 9	`php:8.2-9080020260806120914.9`	fixed	`RHSA-2026:61903`
Red Hat Enterprise Linux 8	`php:8.2-8100020260806050858.f7998665`	fixed	`RHSA-2026:57574`
Red Hat Enterprise Linux 8	`php:7.4-8100020260805070257.f7998665`	fixed	`RHSA-2026:62334`
Red Hat Enterprise Linux 6	`php`	out of support scope
Red Hat Enterprise Linux 10	`php8.4-0:8.4.24-1.el10_2`	fixed	`RHSA-2026:56969`
Red Hat Enterprise Linux 10	`php-0:8.3.33-1.el10_2`	fixed	`RHSA-2026:62614`

From the Debian security tracker, Ubuntu CVE tracker and Red Hat Security Data API, refreshed every few hours.

Sources

Page generated automatically from official sources on 2026-11-03 18:05 UTC. Always confirm with your vendor's advisory.