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CVE-2026-109618: PHP uses longjmp() for out-of-memory (OOM) errors to exit the current context and abort handling of the reques

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CRITICAL 9.8REMOTEUPGRADEMITIGATEUPGRADE

CVE-2026-109618 is a critical-severity flaw (CVSS 9.8) affecting php, ruggedcom ape1808 firmware, pan-os. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

PHP uses longjmp() for out-of-memory (OOM) errors to exit the current context and abort handling of the request. Some contexts may not properly account for this scenario and leave request memory in an uninitialized state before performing an allocation. The subsequent request cleanup procedure may read or branch on this memory. Multiple OOM strategies can consistently trigger this condition and lead to remote code execution (RCE).

Why this priority

  • Critical severity
  • EPSS top 4%: very likely to be exploited
  • Public exploit reference
  • Covered by 11 security sources
  • Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score9.8 (Critical)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededNone
User interactionNone
EPSS exploit chance11.6% (top 4%)
CISA exploited listNo
WeaknessCWE-416, CWE-755, CWE-824, CWE-1325
Published2026-10-21
Last modified2026-10-23
Publisher (CNA): PHP Group · Vendor: paloaltonetworks · php · siemens

Am I affected?

Timeline

php php UPGRADE
Affected: >= 7.3.0 and < 8.2.35 · >= 8.3.0 and < 8.3.36 · >= 8.4.0 and < 8.4.27 · >= 8.5.0 and < 8.5.12
Fixed in: 8.2.35, 8.3.36, 8.4.27, 8.5.12
Safe to downgrade to: a release before 7.3.0
1. Check installed version
apt-cache policy php || rpm -q php || php --version
2. UPGRADE to 8.2.35 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade php
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade php
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 7.3.0 (Debian / Ubuntu)
apt-cache madison php sudo apt install php=<VERSION_BEFORE_7.3.0> sudo apt-mark hold php
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list php sudo dnf downgrade php-<VERSION_BEFORE_7.3.0> sudo dnf versionlock add php
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
siemens ruggedcom ape1808 firmware MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
paloaltonetworks pan-os UPGRADE
Affected: >= 10.2.0 and < 10.2.7 · 10.2.7 · 10.2.7 h1 · 10.2.7 h10 · 10.2.7 h11 · 10.2.7 h12 · 10.2.7 h13 · 10.2.7 h14
Fixed in: 10.2.7, 11.1.4, 11.2.4, 12.1.4, 12.2.4
Safe to downgrade to: a release before 10.2.0
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.
paloaltonetworks panorama virtual appliance MITIGATE
Affected: all versions
Fixed in: no fixed release known
Safe to downgrade to: no unaffected older release
1. Check installed version
apt-cache policy panorama-virtual-appliance || rpm -q panorama-virtual-appliance || panorama-virtual-appliance --version
No fixed or unaffected release known
Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.
Fedora 46 · python-openslide · FIXED · 1.4.7-1.fc46 · FEDORA-2026-336bea884e · source
sudo dnf upgrade --advisory=FEDORA-2026-336bea884e
Fedora ELN · valgrind · FIXED · 3.28.0-1.eln159 · FEDORA-2026-c593ef1d15 · source
sudo dnf upgrade --advisory=FEDORA-2026-c593ef1d15
Ubuntu 20.04 · php7.4 · FIXED · 7.4.3-4ubuntu2.29+esm5
sudo apt update && sudo apt install --only-upgrade php7.4 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' php7.4)" ge "7.4.3-4ubuntu2.29+esm5" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 22.04 · php8.1 · FIXED · 8.1.2-1ubuntu2.28
sudo apt update && sudo apt install --only-upgrade php8.1 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' php8.1)" ge "8.1.2-1ubuntu2.28" && echo PATCHED || echo STILL-VULNERABLE
Ubuntu 24.04 · php8.3 · FIXED · 8.3.6-0ubuntu0.24.04.13
sudo apt update && sudo apt install --only-upgrade php8.3 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' php8.3)" ge "8.3.6-0ubuntu0.24.04.13" && echo PATCHED || echo STILL-VULNERABLE
Debian 12 · php8.2 · FIXED · 8.2.35-1~deb12u1
sudo apt update && sudo apt install --only-upgrade php8.2 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' php8.2)" ge "8.2.35-1~deb12u1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · php8.4 · FIXED · 8.4.27-1~deb13u1
sudo apt update && sudo apt install --only-upgrade php8.4 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' php8.4)" ge "8.4.27-1~deb13u1" && echo PATCHED || echo STILL-VULNERABLE
RHEL 10 · php · FIXED · php-8.3.36-1.el10_2
sudo dnf upgrade --advisory=RHSA-2026:87070 rpm -q php
RHEL 10 · php8.4 · FIXED · php8.4-8.4.27-1.el10_2
sudo dnf upgrade --advisory=RHSA-2026:87071 rpm -q php8.4
RHEL 10.0 Extended Update Support · php · FIXED · php-8.3.19-1.el10_0.2
sudo dnf upgrade --advisory=RHSA-2026:88561 rpm -q php
RHEL 9 · php · FIXED · php-8.0.30-8.el9_8.1
sudo dnf upgrade --advisory=RHSA-2026:87151 rpm -q php
RHEL 9.2 Update Services for SAP Solutions · php · FIXED · php-8.0.30-1.el9_2.2
sudo dnf upgrade --advisory=RHSA-2026:88659 rpm -q php
Alpine 3.21 · php82 · FIXED · php82-8.2.35-r0
apk add --upgrade php82 apk info -v php82
Alpine 3.22 · php82 · FIXED · php82-8.2.35-r0
apk add --upgrade php82 apk info -v php82
Alpine 3.22 · php83 · FIXED · php83-8.3.36-r0
apk add --upgrade php83 apk info -v php83
Alpine 3.22 · php84 · FIXED · php84-8.4.27-r0
apk add --upgrade php84 apk info -v php84
Amazon Linux 2023 · see advisory · FIXED · ALAS2023-2026-3304 · source
sudo dnf update --advisory=ALAS2023-2026-3304

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Advisories and coverage

Official advisories

Research and news

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Related CVEs

References

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