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CVE-2026-44597

Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a...

3.7 LowFix available

Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a reason in its payload, aka TROVE-2026-011.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
Low

Exploit likelihood

0.45%Up 0.4 points since May 7, 2026
90%50%10%1%

What each source reports

CVE List Score used 3.7

Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a reason in its payload, aka TROVE-2026-011.

Record
CVE-2026-44597
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-684
Updated
2026-11-02
EUVDEUVD-2026-28231 3.7

Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a reason in its payload, aka TROVE-2026-011.

Record
EUVD-2026-28231
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Updated
2026-11-02
GitHub AdvisoriesGHSA-94jg-w625-jq92 3.7

Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a...

Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a reason in its payload, aka TROVE-2026-011.

Record
GHSA-94jg-w625-jq92
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-684
Updated
2026-11-02
NVD 3.7

Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a reason in its payload, aka TROVE-2026-011.

Record
CVE-2026-44597
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Weakness
CWE-684
Updated
2026-11-02
OSV 3.7

Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a reason in its payload, aka TROVE-2026-011.

Record
CVE-2026-44597
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness
CWE-684
Updated
2026-11-02
OSVDEBIAN-CVE-2026-44597 9.1

Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a reason in its payload, aka TROVE-2026-011.

Record
DEBIAN-CVE-2026-44597
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Updated
2026-11-02
Show 4 moreShow less
OSVUBUNTU-CVE-2026-44597 3.7

Tor before 0.4.9.7 has an out-of-bounds read when an END, a TRUNCATE, or a TRUNCATED cell lacks a reason in its payload, aka TROVE-2026-011.

Record
UBUNTU-CVE-2026-44597
CVSS 3.1
3.7 LowCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS 3.1
9.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Updated
2026-11-02
OSVMGASA-2026-0187 No score

Updated tor packages fix security issues

This update provides lots of security issues fixed by upstream since our current version. Please see the links for details.

Record
MGASA-2026-0187
Updated
2026-11-02
OSVopenSUSE-SU-2026:10735-1 No score

tor-0.4.9.8-1.1 on GA media

These are all security issues fixed in the tor-0.4.9.8-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:10735-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:20709-1 No score

Security update for tor

This update for tor fixes the following issues:

Changes in tor:

  • Update to 0.4.9.8

    • Fix out-of-bounds read (boo#1264341, CVE-2026-44597, TROVE-2026-011)
    • Do not attempt or accept BEGIN_DIR via conflux legs (boo#1264342, CVE-2026-44599,TROVE-2026-008)
    • Adjust conflux out-of-order queue accounting when clearing a queue (boo#1264343, CVE-2026-44600, TROVE-2026-010)
    • Fix a client-side crash caused by double-close of a circuit while under circuit queue memory pressure (boo#1264344, CVE-2026-44601, TROVE-2026-009)
    • Fix null pointer dereference when receiving a CERT cell out of order (boo#1264345, CVE-2026-44602, TROVE-2026-006)
    • Fix off-by-one out-of-bounds read if a malformed BEGIN cell is received (boo#1264346, CVE-2026-44603, TROVE-2026-007)

  • upate to 0.4.9.5:

    • first stable release in the 0.4.9 series
    • introduces a new circuit-level encryption design for better client security
    • introduce a more scalable way for large relay operators to annotate which relays they run so clients can avoid using too many of them in a single circuit
Record
openSUSE-SU-2026:20709-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
tor
Debian:12
 before 0.4.9.8-0+deb12u1, plus listed versions
0.4.7.13-10.4.7.16-10.4.8.10-10.4.8.10-1~bpo11+10.4.8.10-1~bpo12+1
Show 36 moreShow less
0.4.8.11-10.4.8.11-1~bpo11+10.4.8.11-1~bpo12+10.4.8.12-10.4.8.12-1.10.4.8.12-1~bpo11+10.4.8.12-1~bpo12+10.4.8.13-10.4.8.13-20.4.8.13-2~bpo12+10.4.8.14-10.4.8.14-1~bpo12+10.4.8.16-10.4.8.21-10.4.8.21-1~bpo12+10.4.8.21-1~bpo13+10.4.8.21-1~bpo13+20.4.8.22-10.4.8.22-1~bpo12+10.4.8.22-1~bpo13+10.4.8.4-20.4.8.5-10.4.8.6-10.4.8.7-10.4.8.8-10.4.8.9-10.4.8.9-1~bpo11+10.4.8.9-1~bpo12+10.4.9.5-10.4.9.5-20.4.9.5-2~bpo12+10.4.9.5-2~bpo13+10.4.9.6-0+deb12u10.4.9.6-10.4.9.6-1~bpo12+10.4.9.6-1~bpo13+1
0.4.9.8-0+deb12u1
tor
Debian:13
 before 0.4.9.8-0+deb13u1, plus listed versions
0.4.8.16-10.4.8.21-10.4.8.21-1~bpo12+10.4.8.21-1~bpo13+10.4.8.21-1~bpo13+2
Show 11 moreShow less
0.4.8.22-10.4.8.22-1~bpo12+10.4.8.22-1~bpo13+10.4.9.5-10.4.9.5-20.4.9.5-2~bpo12+10.4.9.5-2~bpo13+10.4.9.6-0+deb13u10.4.9.6-10.4.9.6-1~bpo12+10.4.9.6-1~bpo13+1
0.4.9.8-0+deb13u1
tor
Debian:14
 before 0.4.9.8-1, plus listed versions
0.4.8.16-10.4.8.21-10.4.8.21-1~bpo12+10.4.8.21-1~bpo13+10.4.8.21-1~bpo13+2
Show 12 moreShow less
0.4.8.22-10.4.8.22-1~bpo12+10.4.8.22-1~bpo13+10.4.9.5-10.4.9.5-20.4.9.5-2~bpo12+10.4.9.5-2~bpo13+10.4.9.6-10.4.9.6-1~bpo12+10.4.9.6-1~bpo13+10.4.9.8-1~bpo12+10.4.9.8-1~bpo13+1
0.4.9.8-1
tor
Mageia:9
From an advisory covering 7 CVEs
 before 0.4.9.8-1.mga9
0.4.9.8-1.mga9
tor
Ubuntu:Pro:14.04:LTS
 All versions, plus listed versions
0.2.3.25-10.2.4.19-10.2.4.20-10.2.4.27-1build0.14.04.10.2.4.27-1ubuntu0.10.2.4.27-1ubuntu0.1+esm10.2.4.27-1ubuntu0.1+esm2
 None known
tor
Ubuntu:Pro:16.04:LTS
 All versions, plus listed versions
0.2.6.10-1ubuntu20.2.7.6-1ubuntu10.2.9.11-1ubuntu1~16.04.10.2.9.14-1ubuntu1~16.04.10.2.9.14-1ubuntu1~16.04.20.2.9.14-1ubuntu1~16.04.30.2.9.14-1ubuntu1~16.04.3+esm1
 None known
tor
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
0.3.0.10-10.3.1.8-20.3.1.9-10.3.2.9-10.3.2.9-1build1
Show 4 moreShow less
0.3.2.10-10.3.2.10-1ubuntu0.10.3.2.10-1ubuntu0.2~esm10.3.2.10-1ubuntu0.2~esm2
 None known
tor
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
0.4.1.5-10.4.1.5-1build10.4.1.6-10.4.2.5-10.4.2.6-10.4.2.7-10.4.2.7-1ubuntu0.1~esm1
 None known
tor
Ubuntu:22.04:LTS
 All versions, plus listed versions
0.4.5.9-10.4.6.8-10.4.6.8-1build10.4.6.9-10.4.6.10-10.4.9.11-0ubuntu0.22.04.1
 None known
tor
Ubuntu:24.04:LTS
 All versions, plus listed versions
0.4.8.4-20.4.8.7-10.4.8.9-10.4.8.10-10.4.8.10-1build10.4.8.10-1build20.4.9.11-0ubuntu0.24.04.1
 None known
Show 4 moreShow less
Affected packages
PackageAffectedFixed
tor
Ubuntu:25.10
 All versions, plus listed versions
0.4.8.14-10.4.8.16-1
 None known
tor
Ubuntu:26.10
 All versions, plus listed versions
0.4.9.6-10.4.9.8-10.4.9.11-10.4.9.11-1build1
 None known
tor
Ubuntu:26.04:LTS
 All versions, plus listed versions
0.4.8.16-10.4.8.21-10.4.8.22-10.4.9.6-10.4.9.11-0ubuntu0.26.04.1
 None known
tor
openSUSE:Tumbleweed
From an advisory covering 6 CVEs
 before 0.4.9.8-1.1
0.4.9.8-1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-44597 is a low vulnerability (CVSS 3.7) in Torproject Tor, published May 7, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.45%, the 39th percentile. Fixed in tor 0.4.9.8-0+deb12u1.

References

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