CVE-2026-44603
critical
CVSS v3
9.1
CVSS v4 NEW
—
VIR risk
9.1
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.
Predictions
Exploit likelihood
94%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | fixed | 0.4.9.8-0+deb12u1 |
| debian | bullseye | affected | |
| debian | forky | fixed | 0.4.9.8-1 |
| debian | sid | fixed | 0.4.9.8-1 |
| debian | trixie | fixed | 0.4.9.8-0+deb13u1 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| torproject | tor | {"endExcluding":"0.4.9.7"} | 0.4.9.7 |
References
- https://forum.torproject.org/c/news/tor-release-announcement/28
- https://gitlab.torproject.org/tpo/core/tor/-/commit/1703df3d439c83c2184e259fad1cfa19240f9c89
- https://gitlab.torproject.org/tpo/core/tor/-/work_items/41245
- https://www.openwall.com/lists/oss-security/2026/05/06/8
- https://security-tracker.debian.org/tracker/CVE-2026-44603
CWEs
CWE-193
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.