CVE-2026-77641
Possible ATT&CK Techniques 1AI
T1499 · Endpoint Denial of ServiceAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| torproject | Tor | 0.4.8.1-alpha< 0.4.9.9 | affected |
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I. Basic Information for CVE-2026-77641
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
tor before 0.4.9.9 was prone to a NULL write after free when sending a CONFLUX_SWITCH cell fails. The return value of relay_send_command_from_edge() was ignored, so a send failure (which calls circuit_mark_for_close() and removes the leg via cfx_del_leg()) would go undetected, causing the caller to write to the now-freed current leg and resulting in a crash. This is TROVE-2026-017.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加检查的返回值
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| torproject | Tor | 0.4.8.1-alpha ~ 0.4.9.9 | - |
II. Public POCs for CVE-2026-77641
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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Other References for CVE-2026-77641 (1)
Same Patch Batch · torproject · 2026-08-20 · 7 CVEs total
| CVE-2026-77638 | 8.9 HIGH | Tor <0.4.9.11中间人竞争条件漏洞 |
| CVE-2026-77642 | 7.5 HIGH | Tor <0.4.9.9共识解析越界写入漏洞 |
| CVE-2026-77584 | 7.0 HIGH | Tor <0.4.9.10 释放后使用漏洞 |
| CVE-2026-77587 | 5.9 MEDIUM | Tor 0.4.9.11前存在释放后使用漏洞 |
| CVE-2026-77639 | 5.3 MEDIUM | Tor <0.4.9.9 压缩炸弹绕过漏洞 |
| CVE-2026-77640 | 3.7 LOW | Tor <0.4.9.9 zlib截断流无限循环漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-77641
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