CVE-2026-44603

LOW

Published May 7, 2026 Modified May 7, 2026 CWE-193

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.

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CVSS v3.1 Score

3.7

LOW

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

EPSS — Exploit Prediction

0.0006

Probability of exploitation

0.18%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-193 CWE-193

Affected Products

Vendor	Product	Versions
torproject	tor	< 0.4.9.7

References

Advisories & Patches

https://gitlab.torproject.org/tpo/core/tor/-/commit/1703df3d439c83c2184e259fad1cfa19240f9c89

Other References

https://forum.torproject.org/c/news/tor-release-announcement/28 https://gitlab.torproject.org/tpo/core/tor/-/work_items/41245 https://www.openwall.com/lists/oss-security/2026/05/06/8

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. It has a CVSS v3.1 base score of 3.7 (LOW).

How severe is CVE-2026-44603? +

CVE-2026-44603 has a CVSS v3.1 score of 3.7 out of 10, rated LOW. This is a low-severity vulnerability with limited impact. The EPSS score is 0.0006, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-44603? +

CVE-2026-44603 affects products from torproject, specifically: tor. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-44603? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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