Upstream information
Description
Cap'n Proto is a data interchange format and capability-based RPC system. Prior to 1.4.0, when using Transfer-Encoding: chunked, if a chunk's size parsed to a value of 2^64 or larger, it would be truncated to a 64-bit integer. In theory, this bug could enable HTTP request/response smuggling. This vulnerability is fixed in 1.4.0.SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having moderate severity.
| CVSS detail | SUSE |
|---|---|
| Base Score | 6.5 |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | None |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality Impact | Low |
| Integrity Impact | Low |
| Availability Impact | None |
| CVSSv3 Version | 3.1 |
| CVSS detail | CNA (GitHub) | SUSE |
|---|---|---|
| Base Score | 6.3 | 6.3 |
| Vector | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N |
| Attack Vector | Network | Network |
| Attack Complexity | High | Low |
| Attack Requirements | Present | Present |
| Privileges Required | None | None |
| User Interaction | None | None |
| Vulnerable System Confidentiality Impact | Low | Low |
| Vulnerable System Integrity Impact | Low | Low |
| Vulnerable System Availability Impact | None | None |
| Subsequent System Confidentiality Impact | None | None |
| Subsequent System Integrity Impact | None | None |
| Subsequent System Availability Impact | None | None |
| CVSSv4 Version | 4.0 | 4.0 |
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.
| Product(s) | Source package | State |
|---|---|---|
| Products under general support and receiving all security fixes. | ||
| SUSE Linux Enterprise Desktop 15 SP7 | capnproto | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP7 | capnproto | Affected |
| SUSE Linux Enterprise Module for Desktop Applications 15 SP7 | capnproto | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | capnproto | Affected |
| SUSE Linux Enterprise Server 15 SP7 | capnproto | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | capnproto | Affected |
| openSUSE Leap 15.6 | capnproto | Affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise High Performance Computing 15 SP4 | capnproto | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | capnproto | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | capnproto | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | capnproto | Affected |
| SUSE Linux Enterprise Module for Desktop Applications 15 SP4 | capnproto | Affected |
| SUSE Linux Enterprise Module for Desktop Applications 15 SP5 | capnproto | Affected |
| SUSE Linux Enterprise Server 15 SP4 | capnproto | Affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | capnproto | Affected |
| SUSE Linux Enterprise Server 15 SP5 | capnproto | Affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | capnproto | Affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | capnproto | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | capnproto | Affected |
| SUSE Manager Proxy 4.3 | capnproto | Affected |
| SUSE Manager Retail Branch Server 4.3 | capnproto | Affected |
| SUSE Manager Server 4.3 | capnproto | Affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| SUSE Linux Enterprise Desktop 15 SP4 | capnproto | Affected |
| SUSE Linux Enterprise Desktop 15 SP5 | capnproto | Affected |
| SUSE Linux Enterprise Desktop 15 SP6 | capnproto | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | capnproto | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | capnproto | Affected |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | capnproto | Affected |
| SUSE Linux Enterprise Module for Desktop Applications 15 SP6 | capnproto | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP5 | capnproto | Affected |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | capnproto | Affected |
| SUSE Linux Enterprise Real Time 15 SP4 | capnproto | Affected |
| SUSE Linux Enterprise Server 15 SP6 | capnproto | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | capnproto | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | capnproto | Affected |
| openSUSE Leap 15.4 | capnproto | Affected |
| openSUSE Leap 15.5 | capnproto | Affected |
SUSE Timeline for this CVE
CVE page created: Thu Mar 12 22:03:33 2026CVE page last modified: Fri Mar 13 19:46:56 2026