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CVE-2026-77639

Quick assessment

Affected
torproject Tor
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Tor 0.4.9.9 版本之前，存在一种压缩炸弹绕过漏洞。攻击者可以通过拼接多个 gzip 或 zlib 子流，每个子流的大小均略低于单个子流的检测阈值，从而完全绕过压缩炸弹检测机制。此漏洞编号为 TROVE-2026-022。

CVSS 5.3 · Medium EPSS 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
torproject Tor 0.3.1.1-alpha< 0.4.9.9 affected
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I. Basic Information for CVE-2026-77639

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 compression bomb bypass where an attacker could concatenate many gzip or zlib sub-streams, each just under the per-stream detection threshold, to avoid the compression bomb check entirely. This is TROVE-2026-022.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未保护的候选通道
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
torproject Tor 0.3.1.1-alpha ~ 0.4.9.9 -

II. Public POCs for CVE-2026-77639

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-77639

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Other References for CVE-2026-77639 (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-2026-77641 6.5 MEDIUM Tor 0.4.9.9前版本释放后空指针写入漏洞
CVE-2026-77587 5.9 MEDIUM Tor 0.4.9.11前存在释放后使用漏洞
CVE-2026-77640 3.7 LOW Tor <0.4.9.9 zlib截断流无限循环漏洞

IV. Related Vulnerabilities

Same product: Tor
Same vendor: torproject
Same weakness: CWE-420

V. Comments for CVE-2026-77639

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