CVE-2026-39396 | OpenBao up to 2.5.2 OCI Plugin ExtractPluginFromImage resource consumption (GHSA-r65v-xgwc-g56j)

VDB-358397 · CVE-2026-39396 · GHSA-R65V-XGWC-G56J OPENBAO UP TO 2.5.2 OCI PLUGIN EXTRACTPLUGINFROMIMAGE RESOURCE CONSUMPTION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 3.0 $0-$5k 1.93+ Summaryinfo A vulnerability marked as problematic has been reported in OpenBao up to 2.5.2. The affected element is the function ExtractPluginFromImage of the component OCI Plugin. The manipulation leads to resource consumption. This vulnerability is uniquely identified as CVE-2026-39396. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component. Detailsinfo A vulnerability was found in OpenBao up to 2.5.2. It has been rated as problematic. This issue affects the function ExtractPluginFromImage of the component OCI Plugin. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability. The summary by CVE is: 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. The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-39396 since 04/07/2026. The exploitation is known to be difficult. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue. Upgrading to version 2.5.3 eliminates this vulnerability. Productinfo Name OpenBao Version 2.5.0 2.5.1 2.5.2 Website Product: https://github.com/openbao/openbao/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 3.1 VulDB Meta Temp Score: 3.0 VulDB Base Score: 3.1 VulDB Temp Score: 3.0 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 3.1 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Resource consumption CWE: CWE-400 / CWE-404 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: OpenBao 2.5.3 Timelineinfo 04/07/2026 CVE reserved 04/21/2026 +14 days Advisory disclosed 04/21/2026 +0 days VulDB entry created 04/21/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-r65v-xgwc-g56j Status: Confirmed CVE: CVE-2026-39396 (🔒) GCVE (CVE): GCVE-0-2026-39396 GCVE (VulDB): GCVE-100-358397 Entryinfo Created: 04/21/2026 07:15 Changes: 04/21/2026 07:15 (65) Complete: 🔍 Cache ID: 99:E74:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸