CVE-2026-47734
Description
A flaw was found in Dulwich, a pure-Python implementation of Git file formats and protocols. A remote attacker with push access to a Dulwich-based Git server could send a specially crafted thin pack. This crafted pack, with a manipulated delta header, would cause the server to allocate excessive amounts of memory, leading to a Denial of Service (DoS) condition. This vulnerability allows an authenticated attacker to disrupt the availability of the Git server.
Statement
This Moderate impact denial of service flaw in Dulwich affects Red Hat products utilizing Dulwich-based Git server functionalities. An authenticated attacker with push access could send a crafted Git thin pack, causing excessive memory allocation and disrupting service availability. The vulnerability requires prior authentication, but its exploitation can lead to a system crash.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | N/A | 5.7 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | Required |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Other
Technical Impact: Varies by Context
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