Vulnerability in Torproject Tor

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.

EPSS: 0.001 (18.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L.

Affected products

Torproject Tor — versions 0

Weakness classification (CWE)

CWE-193 — Off-by-one Error

References

cve@mitre.org (Release Notes)
cve@mitre.org (Patch)
cve@mitre.org (Broken Link)
cve@mitre.org (Mailing List, Third Party Advisory)

Frequently asked questions

What is CVE-2026-44603?: CVE-2026-44603 is a low-severity vulnerability in Torproject Tor, classified under Off-by-one Error. CVSS score: 3.7/10. Published 2026-05-07.
How severe is CVE-2026-44603?: Low severity. CVSS v3 base score is 3.7 out of 10.