CVE-2026-14355: In PHP versions 8.2.* before 8.2.32, 8.3.* before 8.3.32, 8.4.* before 8.4.23, 8.5.* before 8.5.8, the AES-WRA

Routine

MEDIUM 5.6REMOTEWATCHLISTUPGRADEMITIGATE

CVE-2026-14355 is a medium-severity flaw (CVSS 5.6) affecting php, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In PHP versions 8.2.* before 8.2.32, 8.3.* before 8.3.32, 8.4.* before 8.4.23, 8.5.* before 8.5.8, the AES-WRAP-PAD algorithm implementation in OpenSSL extension contains a buffer allocation flaw. The output buffer for the AES key-wrap-with-padding operation is sized from the plaintext length without accounting for RFC 5649 expansion. This may cause OpenSSL to write beyond allocated memory, corrupting heap metadata and triggering application abor

Why this priority

Remotely exploitable, no login, no user action
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.6 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-122
Published	2026-07-03
Last modified	2026-07-08

Publisher (CNA): PHP Group · Vendor: debian · php

Last updated 2026-07-08 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-03 21:16 UTCPublished CVE record published
2026-07-08 20:11 UTCUpdated Record last modified

php php UPGRADE

Affected: >= 8.2.0 and < 8.2.32 · >= 8.3.0 and < 8.3.32 · >= 8.4.0 and < 8.4.23 · >= 8.5.0 and < 8.5.8

Fixed in: 8.2.32, 8.3.32, 8.4.23, 8.5.8

Safe to downgrade to: a release before 8.2.0

1. Check installed version

apt-cache policy php || rpm -q php || php --version

2. UPGRADE to 8.2.32 (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 8.2.0 (Debian / Ubuntu)

apt-cache madison php sudo apt install php=<VERSION_BEFORE_8.2.0> 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_8.2.0> 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.

debian debian linux MITIGATE

Affected: 12.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.0

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.

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.

Quick answers

How do I fix CVE-2026-14355?

php: upgrade to 8.2.32, 8.3.32, 8.4.23, 8.5.8; debian linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-14355 being exploited?

CVE-2026-14355 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-14355 affect?

CVE-2026-14355 affects php, debian linux. Severity is medium (CVSS 5.6). In PHP versions 8.2.* before 8.2.32, 8.3.* before 8.3.32, 8.4.* before 8.4.23, 8.5.* before 8.5.8, the AES-WRAP-PAD algorithm implementation in OpenSSL extension contains a buffer allocation flaw. The output buffer for the AES key-wrap-with

How urgent is CVE-2026-14355?

Priority 35/100. Remotely exploitable, no login, no user action; On your watchlist

Software pages

OpenSSL vulnerabilities · PHP vulnerabilities · Debian vulnerabilities

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References

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