CVE catalog

CVE-2026-77584

Tor before 0.4.9.10 did not reject a CONFLUX_LINK cell that arrives on a circuit which already has attached streams. A malicious client could send a RELAY_COMMAND_BEGIN before the CONFLUX_LINK on the

[CVE catalog]

Severity
High · CVSS 8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L
Published
Updated
Source
[NVD] · [CVE record]
EPSS
0.25% · Oct 25, 2026

Tor before 0.4.9.10 did not reject a CONFLUX_LINK cell that arrives on a circuit which already has attached streams. A malicious client could send a RELAY_COMMAND_BEGIN before the CONFLUX_LINK on the same circuit, attaching an exit stream that would later end up orphan leaving a dangling circuit back-pointer and a use-after-free (UAF) when the circuit is freed. This is TROVE-2026-025.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debiantorsid0.4.9.14-1fixed
Debiantorforky0.4.9.14-1fixed
Debiantortrixie0.4.9.11-0+deb13u1fixed
Debiantortrixie-security0.4.9.14-0+deb13u1fixed
Debiantorbookworm0.4.9.11-0+deb12u1fixed
Debiantorbookworm-security0.4.9.11-0+deb12u1fixed
CpetorNot reported0.4.9.10fixed
Ubuntutorpro0.4.1.5-1vulnerable
Ubuntutorpro0.4.1.5-1build1vulnerable
Ubuntutorpro0.4.1.6-1vulnerable
Ubuntutorpro0.4.2.5-1vulnerable
Ubuntutorpro0.4.2.6-1vulnerable
Ubuntutorpro0.4.2.7-1vulnerable
Ubuntutorpro0.4.2.7-1ubuntu0.1~esm1vulnerable
Ubuntutor22.040.4.5.9-1vulnerable
Ubuntutor22.040.4.6.8-1vulnerable
Ubuntutor22.040.4.6.8-1build1vulnerable
Ubuntutor22.040.4.6.9-1vulnerable
Ubuntutor22.040.4.6.10-1vulnerable
Ubuntutor22.040.4.9.11-0ubuntu0.22.04.1vulnerable
Ubuntutor24.040.4.8.4-2vulnerable
Ubuntutor24.040.4.8.7-1vulnerable
Ubuntutor24.040.4.8.9-1vulnerable
Ubuntutor24.040.4.8.10-1vulnerable
Ubuntutor24.040.4.8.10-1build1vulnerable
Ubuntutor24.040.4.8.10-1build2vulnerable
Ubuntutor24.040.4.9.11-0ubuntu0.24.04.1vulnerable
Ubuntutor26.040.4.8.16-1vulnerable
Ubuntutor26.040.4.8.21-1vulnerable
Ubuntutor26.040.4.8.22-1vulnerable
Ubuntutor26.040.4.9.6-1vulnerable
Ubuntutor26.040.4.9.11-0ubuntu0.26.04.1vulnerable
Opensusetorleap 16.00.4.9.11-bp160.1.1fixed
Opensusetortumbleweed0.4.9.11-1.1fixed
Fedorator440:0.4.9.14-1.fc44fixed
Fedorator430:0.4.9.14-1.fc43fixed

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debiantorsourcesid0.4.9.11-1not yet assignedNot reportedNot reported
Debiantorsourceforky0.4.9.11-1not yet assignedNot reportedNot reported
Debiantorsourcetrixie0.4.9.11-0+deb13u1not yet assignedNot reportedNot reported
Debiantorsourcebookworm0.4.9.11-0+deb12u1not yet assignedNot reportedNot reported
CpetorcpeNot reported0.4.9.10Not reportedNVD-CVE-2026-77584Not reported
Opensusetorrpmleap 16.00.4.9.11-bp160.1.1Not reportedOPENSUSE-SU-2026:21660-1Not reported
Opensusetorrpmtumbleweed0.4.9.11-1.1Not reportedOPENSUSE-SU-2026:11590-1Not reported
Fedoratorrpm440:0.4.9.14-1.fc44Not reportedFEDORA-2026-F51AF3DB87#CVE-2026-77584Not reported
Fedoratorrpm430:0.4.9.14-1.fc43Not reportedFEDORA-2026-8A3E460F1E#CVE-2026-77584Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [tor]Affected
    Details (6)

    • 0.4.9.11-0+deb12u1 · amd64 · bookworm

      Fixed · Fixed: 0.4.9.11-0+deb12u1

      nvd · tor · debian · bookworm; nvd · tor · debian · 12

    • 0.4.9.11-0+deb12u1 · arm64 · bookworm

      Fixed · Fixed: 0.4.9.11-0+deb12u1

      nvd · tor · debian · bookworm; nvd · tor · debian · 12

    • 0.4.8.14-1~bpo12+1 · amd64 · bookworm-backports

      Affected · Fixed: 0.4.9.11-0+deb12u1

      nvd · tor · debian · bookworm; nvd · tor · debian · 12

    • 0.4.8.14-1~bpo12+1 · arm64 · bookworm-backports

      Affected · Fixed: 0.4.9.11-0+deb12u1

      nvd · tor · debian · bookworm; nvd · tor · debian · 12

    • 0.4.9.11-0+deb12u1 · amd64 · bookworm-security

      Fixed · Fixed: 0.4.9.11-0+deb12u1

      nvd · tor · debian · bookworm; nvd · tor · debian · 12

    • 0.4.9.11-0+deb12u1 · arm64 · bookworm-security

      Fixed · Fixed: 0.4.9.11-0+deb12u1

      nvd · tor · debian · bookworm; nvd · tor · debian · 12

  • [tor-geoipdb]Affected

    Source package: [tor]

    Details (6)

    • 0.4.9.11-0+deb12u1 · all · bookworm

      Fixed · Fixed: 0.4.9.11-0+deb12u1

      nvd · tor · debian · bookworm; nvd · tor · debian · 12

    • 0.4.9.11-0+deb12u1 · all · bookworm

      Fixed · Fixed: 0.4.9.11-0+deb12u1

      nvd · tor · debian · bookworm; nvd · tor · debian · 12

    • 0.4.8.14-1~bpo12+1 · all · bookworm-backports

      Affected · Fixed: 0.4.9.11-0+deb12u1

      nvd · tor · debian · bookworm; nvd · tor · debian · 12

    • 0.4.8.14-1~bpo12+1 · all · bookworm-backports

      Affected · Fixed: 0.4.9.11-0+deb12u1

      nvd · tor · debian · bookworm; nvd · tor · debian · 12

    • 0.4.9.11-0+deb12u1 · all · bookworm-security

      Fixed · Fixed: 0.4.9.11-0+deb12u1

      nvd · tor · debian · bookworm; nvd · tor · debian · 12

    • 0.4.9.11-0+deb12u1 · all · bookworm-security

      Fixed · Fixed: 0.4.9.11-0+deb12u1

      nvd · tor · debian · bookworm; nvd · tor · debian · 12

[Fedora 43]

  • [tor]Unknown

    Source package: [tor]

    Details (4)

    • 0.4.8.17-3.fc43 · aarch64 · 43

      Unknown

      Version impact unknown

      nvd · tor · fedora · 43

    • 0.4.8.17-3.fc43 · x86_64 · 43

      Unknown

      Version impact unknown

      nvd · tor · fedora · 43

    • 0.4.9.11-1.fc43 · aarch64 · 43

      Unknown

      Version impact unknown

      nvd · tor · fedora · 43

    • 0.4.9.11-1.fc43 · x86_64 · 43

      Unknown

      Version impact unknown

      nvd · tor · fedora · 43

[Fedora 44]

  • [tor]Unknown

    Source package: [tor]

    Details (4)

    • 0.4.9.11-1.fc44 · aarch64 · 44

      Unknown

      Version impact unknown

      nvd · tor · fedora · 44

    • 0.4.9.11-1.fc44 · x86_64 · 44

      Unknown

      Version impact unknown

      nvd · tor · fedora · 44

    • 0.4.9.5-1.fc44 · aarch64 · 44

      Unknown

      Version impact unknown

      nvd · tor · fedora · 44

    • 0.4.9.5-1.fc44 · x86_64 · 44

      Unknown

      Version impact unknown

      nvd · tor · fedora · 44

[Debian 13 (Trixie)]

  • [tor]Fixed
    Details (10)

    • 0.4.9.11-0+deb13u1 · amd64 · trixie

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.11-0+deb13u1 · arm64 · trixie

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.11-1~bpo13+1 · amd64 · trixie-backports

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.11-1~bpo13+1 · arm64 · trixie-backports

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.11-0+deb13u1 · amd64 · trixie-security · Historical version

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.11-0+deb13u1 · arm64 · trixie-security

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.12-0+deb13u1 · amd64 · trixie-security · Historical version

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.12-0+deb13u2 · amd64 · trixie-security · Historical version

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.13-0+deb13u1 · amd64 · trixie-security · Historical version

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.14-0+deb13u1 · amd64 · trixie-security

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

  • [tor-geoipdb]Fixed

    Source package: [tor]

    Details (10)

    • 0.4.9.11-0+deb13u1 · all · trixie

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.11-0+deb13u1 · all · trixie

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.11-1~bpo13+1 · all · trixie-backports

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.11-1~bpo13+1 · all · trixie-backports

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.11-0+deb13u1 · all · trixie-security

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.11-0+deb13u1 · all · trixie-security · Historical version

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.12-0+deb13u1 · all · trixie-security · Historical version

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.12-0+deb13u2 · all · trixie-security · Historical version

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.13-0+deb13u1 · all · trixie-security · Historical version

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

    • 0.4.9.14-0+deb13u1 · all · trixie-security

      Fixed · Fixed: 0.4.9.11-0+deb13u1

      nvd · tor · debian · 13

[openSUSE Tumbleweed]

  • [tor]Fixed

    Source package: [tor]

    Details (1)

    • 0.4.9.11-1.1 · x86_64 · tumbleweed

      Fixed · Fixed: 0.4.9.11-1.1

      nvd · tor · opensuse · tumbleweed

Observed:

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [Fedora security updates (Bodhi)] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]