Upstream information

CVE-2026-59980 at MITRE

Description

hpack is an HTTP/2 Header Encoding for Python. Prior to version 4.2.0, unbounded variable integer decoding can cause run-away computation on malformed input leading to O(n^2) runtime, effectively blocking further processing with large enough unsanitized input. A fix is available in python-hyper/hpack v4.2.0 to restricted variable integer decoding to uint32 to prevent run-away computation. As a workaround, sanitize input to hpack decoder for long sequences of `0xFF` values to prevent malicious use.

SUSE information

Overall state of this security issue: Pending

This issue is currently rated as having moderate severity.

CVSS v3 Scores
CVSS detail SUSE
Base Score 5.3
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact Low
CVSSv3 Version 3.1
CVSS v4 Scores
CVSS detail CNA (GitHub) SUSE
Base Score 6.3 6.3
Vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/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:N/VI:N/VA:L/SC:N/SI:N/SA:N
Attack Vector Network Network
Attack Complexity Low Low
Attack Requirements Present Present
Privileges Required None None
User Interaction None None
Vulnerable System Confidentiality Impact None None
Vulnerable System Integrity Impact None None
Vulnerable System Availability Impact Low Low
Subsequent System Confidentiality Impact None None
Subsequent System Integrity Impact None None
Subsequent System Availability Impact None None
CVSSv4 Version 4.0 4.0
SUSE Bugzilla entry: 1283035 [IN_PROGRESS]

No SUSE Security Announcements cross referenced.

List of released packages

Product(s) Fixed package version(s) References
openSUSE Tumbleweed
  • python313-hpack >= 4.2.0-1.1
  • python314-hpack >= 4.2.0-1.1
 Patchnames:
openSUSE-Tumbleweed-2026-11556

List of packages in QA

Product(s) Package(s)
SUSE Linux Enterprise Module for Python 3 15 SP7
  • python311-hpack >= 4.0.0-150400.8.6.1
SUSE Linux Enterprise Server 15 SP7
  • python311-hpack >= 4.0.0-150400.8.6.1
SUSE Linux Enterprise Desktop 15 SP7
  • python311-hpack >= 4.0.0-150400.8.6.1
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • python311-hpack >= 4.0.0-150400.8.6.1
SUSE Linux Enterprise Module for Server Applications 15 SP7
  • python3-hpack >= 3.0.0-150200.3.5.1
SUSE Linux Enterprise Server 15 SP7
  • python3-hpack >= 3.0.0-150200.3.5.1
SUSE Linux Enterprise Server for SAP Applications 15 SP7
  • python3-hpack >= 3.0.0-150200.3.5.1

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 python-hpack In progress
SUSE Linux Enterprise Module for Python 3 15 SP7 python-hpack In progress
SUSE Linux Enterprise Module for Server Applications 15 SP7 python-hpack In progress
SUSE Linux Enterprise Server 15 SP7 python-hpack In progress
SUSE Linux Enterprise Server 16.0 python-hpack In progress
SUSE Linux Enterprise Server 16.1 python-hpack Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP7 python-hpack In progress
SUSE Linux Enterprise Server for SAP applications 16.0 python-hpack In progress
SUSE Linux Enterprise Server for SAP applications 16.1 python-hpack Affected
openSUSE Leap 16.0 python-hpack Affected
Products under Long Term Service Pack support and receiving important and critical security fixes.
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS python-hpack Affected
SUSE Linux Enterprise High Performance Computing 15 SP5 python-hpack Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS python-hpack Affected
SUSE Linux Enterprise Module for Python 3 15 SP4 python-hpack Affected
SUSE Linux Enterprise Module for Python 3 15 SP5 python-hpack Affected
SUSE Linux Enterprise Module for Python 3 15 SP6 python-hpack Affected
SUSE Linux Enterprise Module for Server Applications 15 SP4 python-hpack Affected
SUSE Linux Enterprise Module for Server Applications 15 SP5 python-hpack Affected
SUSE Linux Enterprise Module for Server Applications 15 SP6 python-hpack Affected
SUSE Linux Enterprise Server 15 SP4 python-hpack Affected
SUSE Linux Enterprise Server 15 SP4-LTSS python-hpack Affected
SUSE Linux Enterprise Server 15 SP5 python-hpack Affected
SUSE Linux Enterprise Server 15 SP5-LTSS python-hpack Affected
SUSE Linux Enterprise Server 15 SP6 python-hpack Affected
SUSE Linux Enterprise Server 15 SP6-LTSS python-hpack Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP4 python-hpack Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP5 python-hpack Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP6 python-hpack Affected
Products past their end of life and not receiving proactive updates anymore.
SUSE Enterprise Storage 7 python-hpack Affected
SUSE Enterprise Storage 7.1 python-hpack Affected
SUSE Linux Enterprise Desktop 15 SP4 python-hpack Affected
SUSE Linux Enterprise Desktop 15 SP5 python-hpack Affected
SUSE Linux Enterprise Desktop 15 SP6 python-hpack Affected
SUSE Linux Enterprise High Performance Computing 15 SP2 python-hpack Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS python-hpack Affected
SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS python-hpack Affected
SUSE Linux Enterprise High Performance Computing 15 SP3 python-hpack Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS python-hpack Affected
SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS python-hpack Affected
SUSE Linux Enterprise High Performance Computing 15 SP4 python-hpack Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS python-hpack Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS python-hpack Affected
SUSE Linux Enterprise Module for Server Applications 15 SP2 python-hpack Affected
SUSE Linux Enterprise Module for Server Applications 15 SP3 python-hpack Affected
SUSE Linux Enterprise Real Time 15 SP2 python-hpack Affected
SUSE Linux Enterprise Real Time 15 SP3 python-hpack Affected
SUSE Linux Enterprise Real Time 15 SP4 python-hpack Affected
SUSE Linux Enterprise Server 15 SP2 python-hpack Affected
SUSE Linux Enterprise Server 15 SP2-BCL python-hpack Affected
SUSE Linux Enterprise Server 15 SP2-LTSS python-hpack Affected
SUSE Linux Enterprise Server 15 SP3 python-hpack Affected
SUSE Linux Enterprise Server 15 SP3-BCL python-hpack Affected
SUSE Linux Enterprise Server 15 SP3-LTSS python-hpack Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP2 python-hpack Affected
SUSE Linux Enterprise Server for SAP Applications 15 SP3 python-hpack Affected
SUSE Manager Proxy 4.1 python-hpack Affected
SUSE Manager Proxy 4.2 python-hpack Affected
SUSE Manager Proxy 4.3 python-hpack Affected
SUSE Manager Proxy LTS 4.3 python-hpack Affected
SUSE Manager Retail Branch Server 4.1 python-hpack Affected
SUSE Manager Retail Branch Server 4.2 python-hpack Affected
SUSE Manager Retail Branch Server 4.3 python-hpack Affected
SUSE Manager Retail Branch Server LTS 4.3 python-hpack Affected
SUSE Manager Server 4.1 python-hpack Affected
SUSE Manager Server 4.2 python-hpack Affected
SUSE Manager Server 4.3 python-hpack Affected
SUSE Manager Server LTS 4.3 python-hpack Affected
openSUSE Leap 15.3 python-hpack Affected
openSUSE Leap 15.4 python-hpack Affected
openSUSE Leap 15.5 python-hpack Affected
openSUSE Leap 15.6 python-hpack Affected
Products at an unknown state of their lifecycle.
SUSE Linux Enterprise Server for NVIDIA 16.1 python-hpack Affected

SUSE Timeline for this CVE

CVE page created: Thu Aug 20 21:12:16 2026
CVE page last modified: Thu Oct 1 18:43:26 2026