CVE-2026-4964 | letta-ai letta 0.16.4 File URL message_helper.py _convert_message_create_to_message ImageContent server-side request forgery

VDB-353841 · CVE-2026-4964 · GCVE-100-353841 LETTA-AI LETTA 0.16.4 FILE URL MESSAGE_HELPER.PY _CONVERT_MESSAGE_CREATE_TO_MESSAGE IMAGECONTENT SERVER-SIDE REQUEST FORGERY HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.7 $0-$5k 1.98+ Summaryinfo A vulnerability was found in letta-ai letta 0.16.4. It has been classified as critical. This issue affects the function _convert_message_create_to_message of the file letta/helpers/message_helper.py of the component File URL Handler. Performing a manipulation of the argument ImageContent results in server-side request forgery. This vulnerability is identified as CVE-2026-4964. The attack can be initiated remotely. Additionally, an exploit exists. The vendor was contacted early about this disclosure but did not respond in any way. Detailsinfo A vulnerability was found in letta-ai letta 0.16.4. It has been classified as critical. This affects the function _convert_message_create_to_message of the file letta/helpers/message_helper.py of the component File URL Handler. The manipulation of the argument ImageContent with an unknown input leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. The advisory is shared at gist.github.com. This vulnerability is uniquely identified as CVE-2026-4964. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details and a public exploit are known. The exploit is shared for download at gist.github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way. There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product. Productinfo Type Artificial Intelligence Software Vendor letta-ai Name letta Version 0.16.4 CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.3 VulDB Meta Temp Score: 5.7 VulDB Base Score: 6.3 VulDB Temp Score: 5.7 VulDB Vector: 🔒 VulDB Reliability: 🔍 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: Server-side request forgery CWE: CWE-918 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Access: Public Status: Proof-of-Concept Download: 🔒 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: no mitigation known Status: 🔍 0-Day Time: 🔒 Timelineinfo 03/27/2026 Advisory disclosed 03/27/2026 +0 days VulDB entry created 03/27/2026 +0 days VulDB entry last update Sourcesinfo Advisory: gist.github.com Status: Not defined CVE: CVE-2026-4964 (🔒) GCVE (CVE): GCVE-0-2026-4964 GCVE (VulDB): GCVE-100-353841 scip Labs: https://www.scip.ch/en/?labs.20161013 Entryinfo Created: 03/27/2026 09:28 Changes: 03/27/2026 09:28 (58), 03/27/2026 09:29 (1) Complete: 🔍 Submitter: Eric-z Cache ID: 99:C18:101 Submitinfo Accepted Submit #777645: letta-ai letta 0.16.4 CWE-918 (by Eric-z) Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸