Vulnerability · Published Sep 25, 2026 · Assigned by php
CVE-2026-92842OOB read / info leak in convert.* stream filters when line-break-chars contains NUL
Medium 5.9
In plain English
A medium-severity heap buffer overflow in PHP from PHP Group. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)5.9Medium
Exploit odds (30 days)0.3%top 79.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
The convert.base64-encode, convert.quoted-printable-encode and convert.quoted-printable-decode stream filters accept a line-break-chars option whose length is tracked separately from the string itself. The filter constructors duplicate the value with pestrdup(), which stops at the first NUL byte, while keeping the original length. When the filter later emits a line break it copies the recorded length out of the truncated allocation, reading past its end and placing adjacent heap bytes into the filter output.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | apcu-panel | 5.1.18-1.module_el8.6.0+2750+78feabcb | ALSA-2026:87080 |
| AlmaLinux:8 | libzip | 1.6.1-1.module_el8.6.0+3239+bedf0508 | ALSA-2026:87080 |
| AlmaLinux:8 | libzip | 1.6.1-1.module_el8.6.0+2750+78feabcb | ALSA-2026:87080 |
| AlmaLinux:8 | libzip | 1.6.1-1.module_el8.10.0+3935+28808425 | ALSA-2026:87080 |
| AlmaLinux:8 | libzip-devel | 1.6.1-1.module_el8.6.0+2750+78feabcb | ALSA-2026:87080 |
| AlmaLinux:8 | libzip-devel | 1.6.1-1.module_el8.10.0+3935+28808425 | ALSA-2026:87080 |
| AlmaLinux:8 | libzip-devel | 1.6.1-1.module_el8.6.0+3239+bedf0508 | ALSA-2026:87080 |
| AlmaLinux:8 | libzip-tools | 1.6.1-1.module_el8.10.0+3935+28808425 | ALSA-2026:87080 |
| AlmaLinux:8 | libzip-tools | 1.6.1-1.module_el8.6.0+3239+bedf0508 | ALSA-2026:87080 |
| AlmaLinux:8 | php | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-bcmath | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-cli | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-common | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-dba | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-dbg | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-devel | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-embedded | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-enchant | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-ffi | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-fpm | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-gd | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-gmp | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-intl | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-json | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-ldap | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-mbstring | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-mysqlnd | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-odbc | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-opcache | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-pdo | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-pear | 1:1.10.13-1.module_el8.10.0+3935+28808425 | ALSA-2026:87080 |
| AlmaLinux:8 | php-pecl-apcu | 5.1.18-1.module_el8.10.0+3935+28808425 | ALSA-2026:87080 |
| AlmaLinux:8 | php-pecl-apcu | 5.1.18-1.module_el8.6.0+2750+78feabcb | ALSA-2026:87080 |
| AlmaLinux:8 | php-pecl-apcu-devel | 5.1.18-1.module_el8.6.0+2750+78feabcb | ALSA-2026:87080 |
| AlmaLinux:8 | php-pecl-apcu-devel | 5.1.18-1.module_el8.10.0+3935+28808425 | ALSA-2026:87080 |
| AlmaLinux:8 | php-pecl-rrd | 2.0.1-1.module_el8.6.0+2750+78feabcb | ALSA-2026:87080 |
| AlmaLinux:8 | php-pecl-rrd | 2.0.1-1.module_el8.6.0+3239+bedf0508 | ALSA-2026:87080 |
| AlmaLinux:8 | php-pecl-rrd | 2.0.1-1.module_el8.10.0+3935+28808425 | ALSA-2026:87080 |
| AlmaLinux:8 | php-pecl-xdebug | 2.9.5-1.module_el8.6.0+3239+bedf0508 | ALSA-2026:87080 |
| AlmaLinux:8 | php-pecl-xdebug | 2.9.5-1.module_el8.6.0+2750+78feabcb | ALSA-2026:87080 |
| AlmaLinux:8 | php-pecl-zip | 1.18.2-1.module_el8.6.0+2750+78feabcb | ALSA-2026:87080 |
| AlmaLinux:8 | php-pecl-zip | 1.18.2-1.module_el8.10.0+3935+28808425 | ALSA-2026:87080 |
| AlmaLinux:8 | php-pecl-zip | 1.18.2-1.module_el8.6.0+3239+bedf0508 | ALSA-2026:87080 |
| AlmaLinux:8 | php-pgsql | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-process | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-snmp | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-soap | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-xml | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| AlmaLinux:8 | php-xmlrpc | 7.4.33-8.module_el8.10.0+4321+cf5fd4bb | ALSA-2026:87080 |
| Alpine:v3.22 | php82 | 8.2.35-r0 | ALPINE-CVE-2026-92842 |
| Alpine:v3.22 | php83 | 8.3.36-r0 | ALPINE-CVE-2026-92842 |
| Alpine:v3.23 | php83 | 8.3.36-r0 | ALPINE-CVE-2026-92842 |
| Alpine:v3.24 | php83 | 8.3.35-r0 | ALPINE-CVE-2026-92842 |
| Alpine:v3.22 | php84 | 8.4.27-r0 | ALPINE-CVE-2026-92842 |
| Alpine:v3.23 | php84 | 8.4.27-r0 | ALPINE-CVE-2026-92842 |
| Alpine:v3.24 | php84 | 8.4.26-r0 | ALPINE-CVE-2026-92842 |
| Alpine:v3.23 | php85 | 8.5.12-r0 | ALPINE-CVE-2026-92842 |
| Alpine:v3.24 | php85 | 8.5.11-r0 | ALPINE-CVE-2026-92842 |
| Debian:12 | php8.2 | 8.2.34-1~deb12u1 | DEBIAN-CVE-2026-92842 |
| Debian:13 | php8.4 | 8.4.26-1~deb13u1 | DEBIAN-CVE-2026-92842 |
| Debian:14 | php8.4 | 8.4.26-1 | DEBIAN-CVE-2026-92842 |
| Rocky Linux:8 | libzip | 0:1.6.1-1.module+el8.10.0+1604+6558efc7 | RLSA-2026:87080 |
| Rocky Linux:8 | libzip | 0:1.6.1-1.module+el8.10.0+1912+72767185 | RLSA-2026:87080 |
| Rocky Linux:8 | php | 0:7.4.33-8.module+el8.10.0+40393+c071e357 | RLSA-2026:87080 |
| Rocky Linux:8 | php-pear | 1:1.10.13-1.module+el8.10.0+1605+02e07af7 | RLSA-2026:87080 |
| Rocky Linux:8 | php-pear | 1:1.10.13-1.module+el8.10.0+1912+72767185 | RLSA-2026:87080 |
| Rocky Linux:8 | php-pear | 1:1.10.13-1.module+el8.10.0+1604+6558efc7 | RLSA-2026:87080 |
| Rocky Linux:8 | php-pecl-apcu | 0:5.1.18-1.module+el8.10.0+1604+6558efc7 | RLSA-2026:87080 |
| Rocky Linux:8 | php-pecl-apcu | 0:5.1.18-1.module+el8.10.0+1912+72767185 | RLSA-2026:87080 |
| Rocky Linux:8 | php-pecl-rrd | 0:2.0.1-1.module+el8.10.0+1604+6558efc7 | RLSA-2026:87080 |
| Rocky Linux:8 | php-pecl-rrd | 0:2.0.1-1.module+el8.4.0+414+2e7afcdd | RLSA-2026:87080 |
| Rocky Linux:8 | php-pecl-rrd | 0:2.0.1-1.module+el8.10.0+1912+72767185 | RLSA-2026:87080 |
| Rocky Linux:8 | php-pecl-xdebug | 0:2.9.5-1.module+el8.10.0+1912+72767185 | RLSA-2026:87080 |
| Rocky Linux:8 | php-pecl-xdebug | 0:2.9.5-1.module+el8.10.0+1604+6558efc7 | RLSA-2026:87080 |
| Rocky Linux:8 | php-pecl-zip | 0:1.18.2-1.module+el8.10.0+1604+6558efc7 | RLSA-2026:87080 |
| Rocky Linux:8 | php-pecl-zip | 0:1.18.2-1.module+el8.10.0+1912+72767185 | RLSA-2026:87080 |
| Ubuntu:22.04:LTS | php8.1 | 8.1.2-1ubuntu2.27 | USN-8936-1 |
| Ubuntu:22.04:LTS | php8.1 | 8.1.2-1ubuntu2.27 | UBUNTU-CVE-2026-92842 |
| Ubuntu:24.04:LTS | php8.3 | 8.3.6-0ubuntu0.24.04.12 | UBUNTU-CVE-2026-92842 |
| Ubuntu:24.04:LTS | php8.3 | 8.3.6-0ubuntu0.24.04.12 | USN-8936-1 |
| Ubuntu:26.04:LTS | php8.5 | 8.5.4-0ubuntu1.4 | UBUNTU-CVE-2026-92842 |
| Ubuntu:26.04:LTS | php8.5 | 8.5.4-0ubuntu1.4 | USN-8936-1 |
| Ubuntu:26.10 | php8.5 | 8.5.9-0ubuntu2 | UBUNTU-CVE-2026-92842 |
| Ubuntu:26.10 | php8.5 | 8.5.9-0ubuntu2 | USN-8936-1 |
Affected products (as reported)
Weakness: CWE-122, CWE-125 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N