{"id":"CVE-2026-47734","title":"dulwich: Dulwich: Denial of Service via crafted Git thin pack (CVE-2026-47734)","summary":"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 d…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-1285","CWE-400","CWE-789"],"vendor":"Red Hat","product":"Red Hat Enterprise Linux 7","affected":["ansible_automation_platform 2","enterprise_linux 7","enterprise_linux 8","openshift_ai_rhoai","openshift_container_platform 4","satellite 6"],"patched":["dulwich 1.2.5"],"published":"2026-06-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T11:23:20+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47734.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47734.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-47734"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2487774"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-47734"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-47734"},{"url":"https://github.com/jelmer/dulwich/releases/tag/dulwich-1.2.5"},{"url":"https://github.com/jelmer/dulwich/security/advisories/GHSA-xrvj-v92f-53gj"},{"url":"https://github.com/advisories/GHSA-xrvj-v92f-53gj"}],"tags":["csaf","vex","red-hat","ghsa","pip"],"epss":0.00188,"epssPercentile":0.08344,"aliases":["GHSA-xrvj-v92f-53gj"],"ecosystem":"pip","scores":{"vendor":6.5,"ghsa":5.7},"ingestedAt":"2026-07-07T15:41:59.614Z","slug":"CVE-2026-47734","body":"## Overview\n\nA 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.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat OpenShift AI (RHOAI), Red Hat OpenShift Container Platform 4, Red Hat Satellite 6 · no fix planned: Red Hat Ansible Automation Platform 2, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat OpenShift AI (RHOAI), … · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-47734.json)\n\n**dulwich: Dulwich: Denial of Service via crafted Git thin pack** — rated Moderate by Red Hat. Released 2026-06-10, updated 2026-10-16.\n\nAffected:\n\n- Red Hat Ansible Automation Platform 2\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat OpenShift AI (RHOAI)\n- Red Hat OpenShift Container Platform 4\n- Red Hat Satellite 6\n\nNo fix planned:\n\n- Red Hat Ansible Automation Platform 2\n- Red Hat Enterprise Linux 7\n- Red Hat Enterprise Linux 8\n- Red Hat OpenShift AI (RHOAI)\n- Red Hat OpenShift Container Platform 4\n- Red Hat Satellite 6\n\n## Remediation\n\nFix deferred\n\nWorkarounds / mitigations:\n\n- This flaw is fixed in Dulwich 1.2.5, which adds a max_input_size limit to add_thin_pack and makes ReceivePackHandler honor the receive.maxInputSize repository configuration setting (equivalent to git index-pack --max-input-size). Upgrade to Dulwich 1.2.5 or later and set receive.maxInputSize in the Git server's repository configuration to a sensible bound for the environment. On unpatched versions, receive.maxInputSize has no effect and cannot be used as a workaround. Until the fixed version is…\n\n## Package advisory (CVE-2026-47734)\n\nAffected packages:\n\n- `dulwich >= 0.1.0, < 1.2.5`\n\nPatched in:\n\n- `dulwich 1.2.5`\n\nSource: https://github.com/advisories/GHSA-xrvj-v92f-53gj","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":222913,"id":"CVE-2026-47734","ts":1792151667492,"field":"cvss","old":"5.7","new":"6.5"}]}