CVE-2026-44603

Name: CVE-2026-44603
Creator: NVD / NIST
Published: 2026-05-07T04:16:35.387+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 0.34%

Last modified Jun 17, 2026

CVE-2026-44603 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. Tor before 0.4.9.7 has an out-of-bounds read by one byte via a malformed BEGIN cell, aka TROVE-2026-007.. EPSS estimates a 0.34% chance of exploitation in the next 30 days.

Description

Tor before 0.4.9.7 has an out-of-bounds read by one byte via a malformed BEGIN cell, aka TROVE-2026-007.

Metrics

CVSS 3.1

9.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS Probability

0.34%

26.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-193

Affected Software

Vendor	Product	Versions
Torproject	Tor	< 0.4.9.7

References

https://forum.torproject.org/c/news/tor-release-announcement/28Release Notes
https://gitlab.torproject.org/tpo/core/tor/-/commit/1703df3d439c83c2184e259fad1cfa19240f9c89Patch
https://gitlab.torproject.org/tpo/core/tor/-/work_items/41245Broken Link
https://www.openwall.com/lists/oss-security/2026/05/06/8Mailing List, Third Party Advisory

Timeline

Published: May 7, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-44603?

Tor before 0.4.9.7 has an out-of-bounds read by one byte via a malformed BEGIN cell, aka TROVE-2026-007.

How severe is CVE-2026-44603?

CVE-2026-44603 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.

How do I fix CVE-2026-44603?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-44603?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST