CVE-2026-44597
Analyzed Analyzed - Analysis Complete
Out-of-Bounds Read in Tor Network Daemon

Publication date: 2026-05-07

Last updated on: 2026-05-07

Assigner: MITRE

Description
Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a reason in its payload, aka TROVE-2026-011.
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Meta Information
Published
2026-05-07
Last Modified
2026-05-07
Generated
2026-06-16
AI Q&A
2026-05-07
EPSS Evaluated
2026-06-15
NVD
CVE-2026-44597
EUVD
EUVD-2026-28231
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
torproject tor to 0.4.9.7 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-684 The code does not function according to its published specifications, potentially leading to incorrect usage.
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Executive Summary

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.

Impact Analysis

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.

Mitigation Strategies

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.

Compliance Impact

The provided information does not specify any impact of CVE-2026-44597 on compliance with common standards and regulations such as GDPR or HIPAA.

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