CVE-2026-44603: CWE-193 Off-by-one Error in torproject Tor
CVE-2026-44603 is an off-by-one out-of-bounds read vulnerability in Tor versions before 0. 4. 9. 7 caused by a malformed BEGIN cell. This flaw is classified as CWE-193 and has a low CVSS score of 3. 7, indicating limited impact. There is no evidence of known exploits in the wild. No official patch or remediation level has been provided yet, and no vendor advisory is available to confirm patch status.
AI Analysis
Technical Summary
This vulnerability involves an off-by-one error in Tor prior to version 0.4.9.7, where processing a malformed BEGIN cell can trigger an out-of-bounds read by one byte. The issue is identified as CWE-193 and does not affect confidentiality, integrity, or cause significant availability impact, reflected in its low CVSS score of 3.7 with network attack vector, high attack complexity, and no privileges or user interaction required.
Potential Impact
The impact is limited to a low-severity out-of-bounds read that does not compromise confidentiality, integrity, or cause major availability disruption. There are no known exploits in the wild, and the vulnerability requires a high level of attack complexity to exploit remotely without privileges or user interaction.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official patch or remediation level is provided, users should monitor torproject advisories for updates and consider upgrading to version 0.4.9.7 or later once available.
CVE-2026-44603: CWE-193 Off-by-one Error in torproject Tor
Description
CVE-2026-44603 is an off-by-one out-of-bounds read vulnerability in Tor versions before 0. 4. 9. 7 caused by a malformed BEGIN cell. This flaw is classified as CWE-193 and has a low CVSS score of 3. 7, indicating limited impact. There is no evidence of known exploits in the wild. No official patch or remediation level has been provided yet, and no vendor advisory is available to confirm patch status.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves an off-by-one error in Tor prior to version 0.4.9.7, where processing a malformed BEGIN cell can trigger an out-of-bounds read by one byte. The issue is identified as CWE-193 and does not affect confidentiality, integrity, or cause significant availability impact, reflected in its low CVSS score of 3.7 with network attack vector, high attack complexity, and no privileges or user interaction required.
Potential Impact
The impact is limited to a low-severity out-of-bounds read that does not compromise confidentiality, integrity, or cause major availability disruption. There are no known exploits in the wild, and the vulnerability requires a high level of attack complexity to exploit remotely without privileges or user interaction.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no official patch or remediation level is provided, users should monitor torproject advisories for updates and consider upgrading to version 0.4.9.7 or later once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-05-07T03:21:24.363Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69fc1394cbff5d8610732771
Added to database: 5/7/2026, 4:22:44 AM
Last enriched: 5/7/2026, 4:37:23 AM
Last updated: 5/7/2026, 5:26:37 AM
Views: 2
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