CVE-2026-44597
Out-of-Bounds Read in Tor Network Daemon
Publication date: 2026-05-07
Last updated on: 2026-05-07
Assigner: MITRE
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| torproject | tor | to 0.4.9.7 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-684 | The code does not function according to its published specifications, potentially leading to incorrect usage. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
CVE-2026-44597 is an out-of-bounds read vulnerability in Tor versions before 0.4.9.7. It occurs when an END, a TRUNCATE, or a TRUNCATED cell lacks a reason in its payload, causing the software to read memory outside the intended bounds.
This vulnerability is part of multiple critical bugs fixed in Tor 0.4.9.7, which also addresses issues like improper handling of BEGIN_DIR commands, incorrect queue accounting, client-side crashes, null pointer dereferences, and off-by-one out-of-bounds reads in malformed cells.
How can this vulnerability impact me? :
This vulnerability can lead to crashes or memory corruption in the Tor software, potentially causing denial of service or unexpected behavior.
Additionally, it may allow security bypasses, which could compromise the integrity or reliability of the Tor network or client.
Users and operators of Tor are strongly advised to upgrade to version 0.4.9.7 to mitigate these risks.
What immediate steps should I take to mitigate this vulnerability?
The Tor Project strongly recommends upgrading to Tor version 0.4.9.7 immediately to fix this vulnerability.
This update addresses multiple critical bugs including out-of-bounds read issues and other flaws that could lead to crashes, memory corruption, or potential security bypasses.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
The provided information does not specify any impact of CVE-2026-44597 on compliance with common standards and regulations such as GDPR or HIPAA.