CVE-2026-47874
Reactor Netty HTTP Server Denial of Service With Pipelined Requests
The vulnerability occurs when a client sends HTTP/1.1 pipelined requests over a single connection, causing the Reactor Netty HTTP server to consume an excessive amount of memory. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
Reactor Netty HTTP Server Denial of Service With Pipelined Requests
The vulnerability occurs when a client sends HTTP/1.1 pipelined requests over a single connection, causing the Reactor Netty HTTP server to consume an excessive amount of memory. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier
- Record
CVE-2026-47874- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-770
- Updated
- 2026-11-02
EUVDEUVD-2026-66831
The vulnerability occurs when a client sends HTTP/1.1 pipelined requests over a single connection, causing the Reactor Netty HTTP server to consume an excessive amount of memory. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier
- Record
EUVD-2026-66831- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-fg4q-58fc-39w8
The vulnerability occurs when a client sends HTTP/1.1 pipelined requests over a single connection...
The vulnerability occurs when a client sends HTTP/1.1 pipelined requests over a single connection, causing the Reactor Netty HTTP server to consume an excessive amount of memory. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier
- Record
GHSA-fg4q-58fc-39w8- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-770
- Updated
- 2026-11-02
NVD
The vulnerability occurs when a client sends HTTP/1.1 pipelined requests over a single connection, causing the Reactor Netty HTTP server to consume an excessive amount of memory. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier
- Record
CVE-2026-47874- CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L - Weakness
- CWE-770
- Updated
- 2026-11-02
OSVCLSA-2026-1791529633 No score
TuxCare security update for io.projectreactor.netty (5 CVEs)
TuxCare rebuilt 3 io.projectreactor.netty packages to address 5 CVEs. Fixed in 1.1.31-tuxcare.4.
- Record
CLSA-2026-1791529633- Updated
- 2026-11-02
OSVCLSA-2026-1791547948 No score
TuxCare security update for io.projectreactor.netty (5 CVEs)
TuxCare rebuilt 3 io.projectreactor.netty packages to address 5 CVEs. Fixed in 1.0.48-tuxcare.5.
- Record
CLSA-2026-1791547948- Updated
- 2026-11-02
Show 4 moreShow less
OSVCLSA-2026-1791989666 No score
TuxCare security update for io.projectreactor.netty (5 CVEs)
TuxCare rebuilt 3 io.projectreactor.netty packages to address 5 CVEs. Fixed in 1.2.18-tuxcare.2.
- Record
CLSA-2026-1791989666- Updated
- 2026-11-02
OSVCLSA-2026-1792505040 No score
TuxCare security update for io.projectreactor.netty (5 CVEs)
TuxCare rebuilt 3 io.projectreactor.netty packages to address 5 CVEs. Fixed in 1.0.32-tuxcare.6.
- Record
CLSA-2026-1792505040- Updated
- 2026-11-02
OSVCLSA-2026-1793116571 No score
TuxCare security update for io.projectreactor.netty (5 CVEs)
TuxCare rebuilt 3 io.projectreactor.netty packages to address 5 CVEs. Fixed in 1.1.15-tuxcare.3.
- Record
CLSA-2026-1793116571- Updated
- 2026-11-02
OSVCLSA-2026-1793345120 No score
TuxCare security update for io.projectreactor.netty (8 CVEs)
TuxCare rebuilt 4 io.projectreactor.netty packages to address 8 CVEs. Fixed in 1.0.34-tuxcare.1.
- Record
CLSA-2026-1793345120- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
io.projectreactor.netty:reactor-netty-coreTuxCare:Maven From an advisory covering 5 CVEs |
1.1.31 up to 1.1.31-tuxcare.4, plus listed versions 1.1.31-tuxcare.11.1.31-tuxcare.21.1.31-tuxcare.3 |
1.1.31-tuxcare.4 |
io.projectreactor.netty:reactor-netty-httpTuxCare:Maven From an advisory covering 5 CVEs |
1.1.31 up to 1.1.31-tuxcare.4, plus listed versions 1.1.31-tuxcare.11.1.31-tuxcare.21.1.31-tuxcare.3 |
1.1.31-tuxcare.4 |
io.projectreactor.netty:reactor-netty-http-braveTuxCare:Maven From an advisory covering 5 CVEs |
1.1.31 up to 1.1.31-tuxcare.4, plus listed versions 1.1.31-tuxcare.11.1.31-tuxcare.21.1.31-tuxcare.3 |
1.1.31-tuxcare.4 |
io.projectreactor.netty:reactor-netty-coreTuxCare:Maven From an advisory covering 5 CVEs |
1.0.48 up to 1.0.48-tuxcare.5, plus listed versions 1.0.48-tuxcare.11.0.48-tuxcare.21.0.48-tuxcare.31.0.48-tuxcare.4 |
1.0.48-tuxcare.5 |
io.projectreactor.netty:reactor-netty-httpTuxCare:Maven From an advisory covering 5 CVEs |
1.0.48 up to 1.0.48-tuxcare.5, plus listed versions 1.0.48-tuxcare.11.0.48-tuxcare.21.0.48-tuxcare.31.0.48-tuxcare.4 |
1.0.48-tuxcare.5 |
io.projectreactor.netty:reactor-netty-http-braveTuxCare:Maven From an advisory covering 5 CVEs |
1.0.48 up to 1.0.48-tuxcare.5, plus listed versions 1.0.48-tuxcare.11.0.48-tuxcare.21.0.48-tuxcare.31.0.48-tuxcare.4 |
1.0.48-tuxcare.5 |
io.projectreactor.netty:reactor-netty-coreTuxCare:Maven From an advisory covering 5 CVEs |
1.2.18 up to 1.2.18-tuxcare.2, plus listed versions 1.2.18-tuxcare.1 |
1.2.18-tuxcare.2 |
io.projectreactor.netty:reactor-netty-httpTuxCare:Maven From an advisory covering 5 CVEs |
1.2.18 up to 1.2.18-tuxcare.2, plus listed versions 1.2.18-tuxcare.1 |
1.2.18-tuxcare.2 |
io.projectreactor.netty:reactor-netty-http-braveTuxCare:Maven From an advisory covering 5 CVEs |
1.2.18 up to 1.2.18-tuxcare.2, plus listed versions 1.2.18-tuxcare.1 |
1.2.18-tuxcare.2 |
io.projectreactor.netty:reactor-netty-coreTuxCare:Maven From an advisory covering 5 CVEs |
1.0.32 up to 1.0.32-tuxcare.6, plus listed versions 1.0.32-tuxcare.11.0.32-tuxcare.21.0.32-tuxcare.31.0.32-tuxcare.41.0.32-tuxcare.5 |
1.0.32-tuxcare.6 |
Show 9 moreShow less
| Package | Affected | Fixed |
|---|---|---|
io.projectreactor.netty:reactor-netty-httpTuxCare:Maven From an advisory covering 5 CVEs |
1.0.32 up to 1.0.32-tuxcare.6, plus listed versions 1.0.32-tuxcare.11.0.32-tuxcare.21.0.32-tuxcare.31.0.32-tuxcare.41.0.32-tuxcare.5 |
1.0.32-tuxcare.6 |
io.projectreactor.netty:reactor-netty-http-braveTuxCare:Maven From an advisory covering 5 CVEs |
1.0.32 up to 1.0.32-tuxcare.6, plus listed versions 1.0.32-tuxcare.11.0.32-tuxcare.21.0.32-tuxcare.31.0.32-tuxcare.41.0.32-tuxcare.5 |
1.0.32-tuxcare.6 |
io.projectreactor.netty:reactor-netty-coreTuxCare:Maven From an advisory covering 5 CVEs |
1.1.15 up to 1.1.15-tuxcare.3, plus listed versions 1.1.15-tuxcare.11.1.15-tuxcare.2 |
1.1.15-tuxcare.3 |
io.projectreactor.netty:reactor-netty-httpTuxCare:Maven From an advisory covering 5 CVEs |
1.1.15 up to 1.1.15-tuxcare.3, plus listed versions 1.1.15-tuxcare.11.1.15-tuxcare.2 |
1.1.15-tuxcare.3 |
io.projectreactor.netty:reactor-netty-http-braveTuxCare:Maven From an advisory covering 5 CVEs |
1.1.15 up to 1.1.15-tuxcare.3, plus listed versions 1.1.15-tuxcare.11.1.15-tuxcare.2 |
1.1.15-tuxcare.3 |
io.projectreactor.netty:reactor-nettyTuxCare:Maven From an advisory covering 8 CVEs |
1.0.34 up to 1.0.34-tuxcare.1 | 1.0.34-tuxcare.1 |
io.projectreactor.netty:reactor-netty-coreTuxCare:Maven From an advisory covering 8 CVEs |
1.0.34 up to 1.0.34-tuxcare.1 | 1.0.34-tuxcare.1 |
io.projectreactor.netty:reactor-netty-httpTuxCare:Maven From an advisory covering 8 CVEs |
1.0.34 up to 1.0.34-tuxcare.1 | 1.0.34-tuxcare.1 |
io.projectreactor.netty:reactor-netty-http-braveTuxCare:Maven From an advisory covering 8 CVEs |
1.0.34 up to 1.0.34-tuxcare.1 | 1.0.34-tuxcare.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| affected | OSV | |
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-47874 is a medium vulnerability (CVSS 5.3) in Pivotal Reactor Netty, 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. No source names a fixed version.