CVE-2026-47863
Reactor Core bufferTimeout fair-backpressure pipeline permanently hangs when upstream delivers items during an active flush
In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition. Reactor Core 3.8.0 - 3.8.6 Reactor Core 3.7.19 and earlier
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
- High
Exploit likelihood
What each source reports
CVE List Score used
Reactor Core bufferTimeout fair-backpressure pipeline permanently hangs when upstream delivers items during an active flush
In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition. Reactor Core 3.8.0 - 3.8.6 Reactor Core 3.7.19 and earlier
- Record
CVE-2026-47863- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-835
- Updated
- 2026-11-02
EUVDEUVD-2026-66828
In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition. Reactor Core 3.8.0 - 3.8.6 Reactor Core 3.7.19 and earlier
- Record
EUVD-2026-66828- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-5jp2-w3vg-5w3x
In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure...
In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition. Reactor Core 3.8.0 - 3.8.6 Reactor Core 3.7.19 and earlier
- Record
GHSA-5jp2-w3vg-5w3x- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-835
- Updated
- 2026-11-02
NVD
In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition. Reactor Core 3.8.0 - 3.8.6 Reactor Core 3.7.19 and earlier
- Record
CVE-2026-47863- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-835
- Updated
- 2026-11-02
OSV
Reactor Core bufferTimeout fair-backpressure pipeline permanently hangs when upstream delivers items during an active flush
In Reactor Core, applications that use the Flux.bufferTimeout operator with fairBackpressure enabled are vulnerable to a Denial of Service (DoS) condition. Reactor Core 3.8.0 - 3.8.6 Reactor Core 3.7.19 and earlier
- Record
CVE-2026-47863- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVCLSA-2026-1791377112 No score
TuxCare security update for io.projectreactor:reactor-core (2 CVEs)
TuxCare rebuilt io.projectreactor:reactor-core to address 2 CVEs. Fixed in 3.6.18-tuxcare.1.
- Record
CLSA-2026-1791377112- Updated
- 2026-11-02
Show 15 moreShow less
OSVCLSA-2026-1791442911 No score
TuxCare security update for io.projectreactor:reactor-core (2 CVEs)
TuxCare rebuilt io.projectreactor:reactor-core to address 2 CVEs. Fixed in 3.6.16-tuxcare.1.
- Record
CLSA-2026-1791442911- Updated
- 2026-11-02
OSVCLSA-2026-1791445468 No score
TuxCare security update for io.projectreactor:reactor-core (2 CVEs)
TuxCare rebuilt io.projectreactor:reactor-core to address 2 CVEs. Fixed in 3.6.13-tuxcare.1.
- Record
CLSA-2026-1791445468- Updated
- 2026-11-02
OSVCLSA-2026-1791446817 No score
TuxCare security update for io.projectreactor:reactor-core (2 CVEs)
TuxCare rebuilt io.projectreactor:reactor-core to address 2 CVEs. Fixed in 3.5.20-tuxcare.1.
- Record
CLSA-2026-1791446817- Updated
- 2026-11-02
OSVCLSA-2026-1792056995 No score
TuxCare security update for io.projectreactor:reactor-core (2 CVEs)
TuxCare rebuilt io.projectreactor:reactor-core to address 2 CVEs. Fixed in 3.5.10-tuxcare.1.
- Record
CLSA-2026-1792056995- Updated
- 2026-11-02
OSVCLSA-2026-1792057279 No score
TuxCare security update for io.projectreactor:reactor-core (2 CVEs)
TuxCare rebuilt io.projectreactor:reactor-core to address 2 CVEs. Fixed in 3.5.14-tuxcare.1.
- Record
CLSA-2026-1792057279- Updated
- 2026-11-02
OSVCLSA-2026-1792063063 No score
TuxCare security update for io.projectreactor:reactor-core (1 CVE)
TuxCare rebuilt io.projectreactor:reactor-core to address 1 CVE. Fixed in 3.5.8-tuxcare.2.
- Record
CLSA-2026-1792063063- Updated
- 2026-11-02
OSVCLSA-2026-1792076078 No score
TuxCare security update for io.projectreactor:reactor-core (2 CVEs)
TuxCare rebuilt io.projectreactor:reactor-core to address 2 CVEs. Fixed in 3.5.12-tuxcare.1.
- Record
CLSA-2026-1792076078- Updated
- 2026-11-02
OSVCLSA-2026-1792080922 No score
TuxCare security update for io.projectreactor:reactor-core (2 CVEs)
TuxCare rebuilt io.projectreactor:reactor-core to address 2 CVEs. Fixed in 3.7.19-tuxcare.1.
- Record
CLSA-2026-1792080922- Updated
- 2026-11-02
OSVCLSA-2026-1792085546 No score
TuxCare security update for io.projectreactor:reactor-core (2 CVEs)
TuxCare rebuilt io.projectreactor:reactor-core to address 2 CVEs. Fixed in 3.6.9-tuxcare.1.
- Record
CLSA-2026-1792085546- Updated
- 2026-11-02
OSVCLSA-2026-1792146378 No score
TuxCare security update for io.projectreactor:reactor-core (2 CVEs)
TuxCare rebuilt io.projectreactor:reactor-core to address 2 CVEs. Fixed in 3.6.12-tuxcare.1.
- Record
CLSA-2026-1792146378- Updated
- 2026-11-02
OSVCLSA-2026-1792152610 No score
TuxCare security update for io.projectreactor:reactor-core (2 CVEs)
TuxCare rebuilt io.projectreactor:reactor-core to address 2 CVEs. Fixed in 3.6.10-tuxcare.1.
- Record
CLSA-2026-1792152610- Updated
- 2026-11-02
OSVCLSA-2026-1792155090 No score
TuxCare security update for io.projectreactor:reactor-core (2 CVEs)
TuxCare rebuilt io.projectreactor:reactor-core to address 2 CVEs. Fixed in 3.6.6-tuxcare.1.
- Record
CLSA-2026-1792155090- Updated
- 2026-11-02
OSVCLSA-2026-1792158950 No score
TuxCare security update for io.projectreactor:reactor-core (2 CVEs)
TuxCare rebuilt io.projectreactor:reactor-core to address 2 CVEs. Fixed in 3.7.14-tuxcare.1.
- Record
CLSA-2026-1792158950- Updated
- 2026-11-02
OSVCLSA-2026-1792165022 No score
TuxCare security update for io.projectreactor:reactor-core (2 CVEs)
TuxCare rebuilt io.projectreactor:reactor-core to address 2 CVEs. Fixed in 3.6.17-tuxcare.1.
- Record
CLSA-2026-1792165022- Updated
- 2026-11-02
OSVCLSA-2026-1793138070 No score
TuxCare security update for io.projectreactor:reactor-core (1 CVE)
TuxCare rebuilt io.projectreactor:reactor-core to address 1 CVE. Fixed in 3.7.12-tuxcare.1.
- Record
CLSA-2026-1793138070- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
io.projectreactor:reactor-coreTuxCare:Maven From an advisory covering 2 CVEs |
3.6.18 up to 3.6.18-tuxcare.1 | 3.6.18-tuxcare.1 |
io.projectreactor:reactor-coreTuxCare:Maven From an advisory covering 2 CVEs |
3.6.16 up to 3.6.16-tuxcare.1 | 3.6.16-tuxcare.1 |
io.projectreactor:reactor-coreTuxCare:Maven From an advisory covering 2 CVEs |
3.6.13 up to 3.6.13-tuxcare.1 | 3.6.13-tuxcare.1 |
io.projectreactor:reactor-coreTuxCare:Maven From an advisory covering 2 CVEs |
3.5.20 up to 3.5.20-tuxcare.1 | 3.5.20-tuxcare.1 |
io.projectreactor:reactor-coreTuxCare:Maven From an advisory covering 2 CVEs |
3.5.10 up to 3.5.10-tuxcare.1 | 3.5.10-tuxcare.1 |
io.projectreactor:reactor-coreTuxCare:Maven From an advisory covering 2 CVEs |
3.5.14 up to 3.5.14-tuxcare.1 | 3.5.14-tuxcare.1 |
io.projectreactor:reactor-coreTuxCare:Maven |
3.5.8 up to 3.5.8-tuxcare.2, plus listed versions 3.5.8-tuxcare.1 |
3.5.8-tuxcare.2 |
io.projectreactor:reactor-coreTuxCare:Maven From an advisory covering 2 CVEs |
3.5.12 up to 3.5.12-tuxcare.1 | 3.5.12-tuxcare.1 |
io.projectreactor:reactor-coreTuxCare:Maven From an advisory covering 2 CVEs |
3.7.19 up to 3.7.19-tuxcare.1 | 3.7.19-tuxcare.1 |
io.projectreactor:reactor-coreTuxCare:Maven From an advisory covering 2 CVEs |
3.6.9 up to 3.6.9-tuxcare.1 | 3.6.9-tuxcare.1 |
Show 6 moreShow less
| Package | Affected | Fixed |
|---|---|---|
io.projectreactor:reactor-coreTuxCare:Maven From an advisory covering 2 CVEs |
3.6.12 up to 3.6.12-tuxcare.1 | 3.6.12-tuxcare.1 |
io.projectreactor:reactor-coreTuxCare:Maven From an advisory covering 2 CVEs |
3.6.10 up to 3.6.10-tuxcare.1 | 3.6.10-tuxcare.1 |
io.projectreactor:reactor-coreTuxCare:Maven From an advisory covering 2 CVEs |
3.6.6 up to 3.6.6-tuxcare.1 | 3.6.6-tuxcare.1 |
io.projectreactor:reactor-coreTuxCare:Maven From an advisory covering 2 CVEs |
3.7.14 up to 3.7.14-tuxcare.1 | 3.7.14-tuxcare.1 |
io.projectreactor:reactor-coreTuxCare:Maven From an advisory covering 2 CVEs |
3.6.17 up to 3.6.17-tuxcare.1 | 3.6.17-tuxcare.1 |
io.projectreactor:reactor-coreTuxCare:Maven |
3.7.12 up to 3.7.12-tuxcare.1 | 3.7.12-tuxcare.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| affected, aliases, published, references | EUVD, OSV | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-47863 is a medium vulnerability (CVSS 5.9) in Broadcom Reactor Core, published August 26, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.40%, the 34th percentile. Fixed in io.projectreactor:reactor-core 3.5.8-tuxcare.2.