{"answers":{"affected":"4 open source packages ship an affected version, including github.com/openbao/openbao and openbao. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39396 exists.","fix":"Upgrade github.com/openbao/openbao to 0.0.0-20260420180337-2b2a901aa9f7 or later.","what":"CVE-2026-39396 is a low-severity denial of service vulnerability in openbao, published on 21 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-39396 and fix it if it is affected.\n\nWhat it is: CVE-2026-39396 is a low-severity denial of service vulnerability in openbao, published on 21 Apr 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-39396 exists.\n\nAffected packages and fixed versions:\n- github.com/openbao/openbao (Go): affected all versions; fixed in 0.0.0-20260420180337-2b2a901aa9f7\n- github.com/openbao/openbao (Go): affected all versions; fixed in 0.0.0-20260420180337-2b2a901aa9f7\n- github.com/openbao/openbao (Go): affected all versions; fixed in 0.0.0-20260420180337-2b2a901aa9f7\n- openbao (Bitnami): affected all versions; fixed in 2.5.3\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-39396/ (Markdown: https://insights.sbomify.com/CVE-2026-39396/index.md)","id":"CVE-2026-39396","markdown":"https://insights.sbomify.com/CVE-2026-39396/index.md","name":"CVE-2026-39396","record":{"aliases":["BIT-openbao-2026-39396","GHSA-r65v-xgwc-g56j","GO-2026-5609"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"OpenBao secrets manager","requires_auth":"none","summary":"An attacker can cause disk exhaustion and denial of service by serving a crafted OCI image with a decompression bomb to OpenBao's plugin extractor.","user_interaction":"required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"openbao","vendor":"openbao"}],"cvss":{"score":3.1,"severity":"low","source":"cna","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L","version":"3.1"},"cwes":[{"id":"CWE-770","name":"Allocation of Resources Without Limits or Throttling"},{"id":"CWE-674","name":"Uncontrolled Recursion"},{"id":"CWE-400","name":"Uncontrolled Resource Consumption"}],"description":"OpenBao is an open source identity-based secrets management system. Prior to version 2.5.3, `ExtractPluginFromImage()` in OpenBao's OCI plugin downloader extracts a plugin binary from a container image by streaming decompressed tar data via `io.Copy` with no upper bound on the number of bytes written. An attacker who controls or compromises the OCI registry referenced in the victim's configuration can serve a crafted image containing a decompression bomb that decompresses to an arbitrarily large file. The SHA256 integrity check occurs after the full file is written to disk, meaning the hash mismatch is detected only after the damage (disk exhaustion) has already occurred. This allow the attacker to replace **legit plugin image** with no need to change its signature. Version 2.5.3 contains a patch.","ecosystems":["Bitnami","Go"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"OpenBao has Decompression Bomb via Unbounded Copy in OCI Plugin Extraction (DoS)","id":"CVE-2026-39396","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":4,"n_references":1,"next":{"headline":"@delmaredigital/payload-puc is missing authorization on /api/puck/* CRUD endpoints allows unauthenticated access to Puck-registered collections","id":"CVE-2026-39397"},"packages":[{"ecosystem":"Bitnami","fixed":["2.5.3"],"introduced":["0"],"last_affected":[],"package":"openbao","purl":"pkg:bitnami/openbao","source":"BIT-openbao-2026-39396"},{"ecosystem":"Go","fixed":["0.0.0-20260420180337-2b2a901aa9f7"],"introduced":["0"],"last_affected":[],"package":"github.com/openbao/openbao","purl":null,"source":"GHSA-r65v-xgwc-g56j"},{"ecosystem":"Go","fixed":["0.0.0-20260420180337-2b2a901aa9f7"],"introduced":["0"],"last_affected":[],"package":"github.com/openbao/openbao","purl":"pkg:golang/github.com/openbao/openbao","source":"GHSA-r65v-xgwc-g56j"},{"ecosystem":"Go","fixed":["0.0.0-20260420180337-2b2a901aa9f7"],"introduced":["0"],"last_affected":[],"package":"github.com/openbao/openbao","purl":"pkg:golang/github.com/openbao/openbao","source":"GO-2026-5609"}],"prev":{"headline":"Cosign's verify-blob-attestation reports false positive when payload parsing fails","id":"CVE-2026-39395"},"products":["openbao"],"published":"2026-04-21","related":[{"cvss_score":9.6,"headline":"OpenBao lacks user confirmation for OIDC direct callback mode","id":"CVE-2026-33757","kev_date_added":null,"published":"2026-03-27"},{"cvss_score":9.4,"headline":"OpenBao has Reflected XSS in its OIDC authentication error message","id":"CVE-2026-33758","kev_date_added":null,"published":"2026-03-27"},{"cvss_score":9.1,"headline":"OpenBao: Privileged Operator May Execute Code on the Underlying Host","id":"CVE-2025-54997","kev_date_added":null,"published":"2025-08-09"},{"cvss_score":7.5,"headline":"OpenBao Privileged Operator Identity Group Root Escalation","id":"CVE-2025-64761","kev_date_added":null,"published":"2025-11-25"},{"cvss_score":7.5,"headline":"OpenBao vulnerable to denial of service via malicious JSON request processing","id":"CVE-2025-59043","kev_date_added":null,"published":"2025-10-17"},{"cvss_score":7.2,"headline":"OpenBao Root Namespace Operator May Elevate Token Privileges","id":"CVE-2025-54996","kev_date_added":null,"published":"2025-08-09"},{"cvss_score":6.9,"headline":"OpenBao Vulnerable to Unauthenticated Rekey Operation Cancellation","id":"CVE-2025-52894","kev_date_added":null,"published":"2025-06-25"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"Go Vulnerability Database","prefix":"GO"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-04-21","vendors":["openbao"]},"summary":"An attacker can cause disk exhaustion and denial of service by serving a crafted OCI image with a decompression bomb to OpenBao's plugin extractor.","url":"https://insights.sbomify.com/CVE-2026-39396/"}