PHP up to 8.2.34/8.3.35/8.4.26/8.5.11 PHP2Shell race condition

Summaryinfo

A vulnerability classified as very critical has been found in PHP up to 8.2.34/8.3.35/8.4.26/8.5.11. The affected element is an unknown function. Performing a manipulation results in race condition. This vulnerability is known as CVE-2026-109619. Remote exploitation of the attack is possible. No exploit is available. Due to its background and reception, this vulnerability has an historic impact. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in PHP up to 8.2.34/8.3.35/8.4.26/8.5.11. It has been classified as very critical. This affects some unknown processing. The manipulation with an unknown input leads to a race condition vulnerability. CWE is classifying the issue as CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

PHP has various global state that temporarily points into request memory. In some scenarios, global state may not be correctly reset, or may be repopulated after being reset. The global state may then refer to request memory even after it has been freed. Subsequent requests may read or branch on this stale state before it is fully initialized. Multiple strategies can trigger this condition and produce remote code execution (RCE).

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-109619 since 10/12/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 10/21/2026). Due to its background and reception, this vulnerability has a historic impact.

We expect the 0-day to have been worth approximately .

Upgrading to version 8.2.35, 8.3.36, 8.4.27 or 8.5.12 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-107265). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

• Programming Language Software

Name

• PHP

Version

• 8.2.0
• 8.2.1
• 8.2.2
• 8.2.3
• 8.2.4
• 8.2.5
• 8.2.6
• 8.2.7
• 8.2.8
• 8.2.9
• 8.2.10
• 8.2.11
• 8.2.12
• 8.2.13
• 8.2.14
• 8.2.15
• 8.2.16
• 8.2.17
• 8.2.18
• 8.2.19
• 8.2.20
• 8.2.21
• 8.2.22
• 8.2.23
• 8.2.24
• 8.2.25
• 8.2.26
• 8.2.27
• 8.2.28
• 8.2.29
• 8.2.30
• 8.2.31
• 8.2.32
• 8.2.33
• 8.2.34
• 8.3.0
• 8.3.1
• 8.3.2
• 8.3.3
• 8.3.4
• 8.3.5
• 8.3.6
• 8.3.7
• 8.3.8
• 8.3.9
• 8.3.10
• 8.3.11
• 8.3.12
• 8.3.13
• 8.3.14
• 8.3.15
• 8.3.16
• 8.3.17
• 8.3.18
• 8.3.19
• 8.3.20
• 8.3.21
• 8.3.22
• 8.3.23
• 8.3.24
• 8.3.25
• 8.3.26
• 8.3.27
• 8.3.28
• 8.3.29
• 8.3.30
• 8.3.31
• 8.3.32
• 8.3.33
• 8.3.34
• 8.3.35
• 8.4.0
• 8.4.1
• 8.4.2
• 8.4.3
• 8.4.4
• 8.4.5
• 8.4.6
• 8.4.7
• 8.4.8
• 8.4.9
• 8.4.10
• 8.4.11
• 8.4.12
• 8.4.13
• 8.4.14
• 8.4.15
• 8.4.16
• 8.4.17
• 8.4.18
• 8.4.19
• 8.4.20
• 8.4.21
• 8.4.22
• 8.4.23
• 8.4.24
• 8.4.25
• 8.4.26
• 8.5.0
• 8.5.1
• 8.5.2
• 8.5.3
• 8.5.4
• 8.5.5
• 8.5.6
• 8.5.7
• 8.5.8
• 8.5.9
• 8.5.10
• 8.5.11

License

• open-source

Website

• Product: https://www.php.org/

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Be aware that VulDB is the high quality source for vulnerability data.

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