CVE-2026-55969: Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift: integer overflow in TProtocol::checkReadBytesAvailable()
CVE-2026-55969 is a vulnerability in Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift, Apache Thrift: integer overflow in TProtocol::checkReadBytesAvailable(), rated Moderate by Microsoft, with a CVSS 3.1 base score of 7.5 (High). 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 1.03% probability of exploitation activity in the next 30 days, higher than 64% of all scored vulnerabilities. Microsoft released the fix on 6 August 2026, outside Patch Tuesday. It affects 10 products in 1 product family (Open Source Software).
Key facts
- CVE ID
- CVE-2026-55969
- Severity
- High CVSS 7.5
- Microsoft severity
- Moderate
- Exploited in the wild
- No
- Publicly disclosed
- No
- Weakness
- CWE-190
- EPSS
- 1.03% (percentile 64%)
- 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-2026-55969 at 7.5 (temporal 7.5) using CVSS 3.1. Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
| Metric | Value |
|---|---|
| Attack vector | Network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality impact | None |
| Integrity impact | None |
| Availability impact | High |
Affected products (10)
Open Source Software
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| azl3 thrift 0.15.0-6 on Azure Linux 3.0 | CBL-Mariner Releases | Security Update | 0.24.0-1 | No |
| azl3 telegraf 1.31.0-27 on Azure Linux 3.0 | ||||
| azl3 telegraf 1.31.0-28 on Azure Linux 3.0 | Security update | Security Update | ||
| azl3 influxdb 2.7.5-19 on Azure Linux 3.0 | CBL-Mariner Releases | Security Update | 2.7.5-20 | No |
| azl3 kata-containers-cc 3.15.0.aks0-16 on Azure Linux 3.0 | ||||
| azl3 vitess 19.0.4-12 on Azure Linux 3.0 | CBL-Mariner Releases | Security Update | 19.0.4-12 | No |
| azl3 telegraf 1.31.0-31 on Azure Linux 3.0 | Security update | Security Update | ||
| azl3 telegraf 1.31.0-33 on Azure Linux 3.0 | Release Notes | Security Update | ||
| azl3 telegraf 1.31.0-35 on Azure Linux 3.0 | Release Notes | Security Update | ||
| azl3 telegraf 1.31.0-36 on Azure Linux 3.0 | Release Notes | Security Update |
NIST NVD data
- NVD status
- Analyzed
- NVD CVSS
- 7.5 (HIGH)
- NVD weakness
- CWE-190
- Published to NVD
- NVD last modified
Affected configurations (CPE)
| Product | Vulnerable versions |
|---|---|
| thrift | before 0.24.0 |
References
- https://lists.apache.org/thread/7v3jhgwfbmhx42424phydlnzb109g8b9 (Release Notes)
- https://lists.apache.org/thread/xmkgd107k795hyrg5kf97mny30sgl5bo (Vendor Advisory)
- http://www.openwall.com/lists/oss-security/2026/07/24/40 (Mailing List, Third Party Advisory)
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. | |
| 2.0 | Information published. | |
| 3.0 | Information published. | |
| 4.0 | Information published. | |
| 5.0 | Information published. | |
| 6.0 | Information published. | |
| 7.0 | Information published. | |
| 8.0 | Information published. | |
| 9.0 | Information published. |