CVE-2026-17544

⛔ critical

Summary

Attacker-provided inputs to bccomp() could lead to an out-of-bounds write with stack and heap corruption in PHP versions from 8.4.* before 8.4.24 and from 8.5.* before 8.5.9.

CVSS Score

9.8

Critical

EPSS Score

0.5

Exploit Probability

Published Date

2026-07-30

First Seen: 2026-07-31

📊 Relative Risk Intelligence

This CVE is Very High Risk - more severe than 90.5% of all 350,976 vulnerabilities in our database.

#33,444

Top 10% most severe

Severity Percentile

🎯 CISA SSVC Assessment Updated: Jul 30, 2026

🔍 Exploitation Status

None

No known exploits

⚙️ Automatable

YES

Can be exploited automatically

💥 Technical Impact

Total

Complete system compromise possible

🏆 Discovered By

Recep Asan Ilija Tovilo - The PHP Foundation (analyst) Saki Takamachi - The PHP Foundation (remediation reviewer)

SSVC data provided by CISA

Last Modified 2026-08-05

Source NVD 🔗

CVSS Vector 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS Vector 4.0

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:N/R:X/V:X/RE:X/U:X

CWE IDs (Weakness Types)

CWE-787

📦 Affected Products 2

Vendor	Product	Status	Affected Versions
php	php	Affected	> 8.4.0 < 8.4.24
php	php	Affected	> 8.5.0 < 8.5.9

🔗 References 1

https://github.com/php/php-src/security/advisories/G...

Vendor Advisory

🔗 Related CVEs 6

CVE ID	Severity	CVSS	EPSS	Summary	Published
CVE-2026-17543	⛔ critical	9.8	0.5	Improper escaping of backslashes in attacker-provided parameters would allow for trivial SQL injection in PHP versions ...	2026-07-30
CVE-2026-7260	🔶 medium	5.5	0.2	Circular symbolic links in phar archives could lead to unbounded recursion, exhausting the C stack and crashing the PHP ...	2026-07-30
CVE-2026-14355	🔶 medium	5.6	0.3	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 algo...	2026-07-03
CVE-2025-14179	⛔ critical	9.8	0.4	In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the PDO Firebird ...	2026-05-10
CVE-2026-6722	⛔ critical	9.8	0.9	In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, the SOAP extensio...	2026-05-10
CVE-2026-6735	🔶 medium	6.1	0.2	In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, 8.5.* before 8.5.6, due to improper sanit...	2026-05-10

These CVEs affect the same products