CVE-2026-17543: SQL injection in ext-pgsql via E'...' backslash breakout
CVE-2026-17543 is a vulnerability in SQL injection in ext-pgsql via E'...' backslash breakout, rated Important by Microsoft, with a CVSS 3.1 base score of 9.8 (Critical). An attacker can exploit it remotely over the network, without any privileges and without user interaction. Microsoft has not reported exploitation in the wild. The EPSS model estimates a 0.33% probability of exploitation activity in the next 30 days, higher than 27% of all scored vulnerabilities. Microsoft released the fix on 6 August 2026, outside Patch Tuesday. It affects 1 product in 1 product family (Open Source Software).
Key facts
- CVE ID
- CVE-2026-17543
- Severity
- Critical CVSS 9.8
- Microsoft severity
- Important
- Exploited in the wild
- No
- Publicly disclosed
- No
- Weakness
- CWE-89
- EPSS
- 0.33% (percentile 27%)
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- July 2026 Patch Tuesday
- Product families
- Open Source Software
CVSS score and vector
Microsoft scores CVE-2026-17543 at 9.8 (temporal 9.8) using CVSS 3.1. Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
| Metric | Value |
|---|---|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality impact | High |
| Integrity impact | High |
| Availability impact | High |
Affected products (1)
Open Source Software
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| azl3 php 8.3.31-1 on Azure Linux 3.0 | CBL-Mariner Releases | Security Update | 8.3.33-1 | No |
Exploitation and detection
Detection and weaponization
Weaponization maturity: Exploit.
Proof-of-concept repositories (1)
NIST NVD data
- NVD status
- Analyzed
- NVD CVSS
- 9.8 (CRITICAL)
- NVD weakness
- CWE-89
- Published to NVD
- NVD last modified
Affected configurations (CPE)
| Product | Vulnerable versions |
|---|---|
| php | from 8.2.0, before 8.2.33 |
| php | from 8.3.0, before 8.3.33 |
| php | from 8.4.0, before 8.4.24 |
| php | from 8.5.0, before 8.5.9 |
References
- https://github.com/php/php-src/security/advisories/GHSA-7qpv-r5mr-78m4 (Vendor Advisory)
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. |