VulnerabilityPublished 5 Jan 2026Updated 23 Feb 2026

CVE-2025-15453: milvus · Deserialization

Affects milvusSource CVE Database V5

Not known to be exploited · CVSS 5.3 Medium.

Data as of 26 Oct 2026, 09:08 UTC

CVSS 4.0 base score

5.3Medium

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.3% chance of exploitation in 30 days – higher than 28% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

Base metrics

Attack Vector: Network
Attack Complexity: Low
Attack Requirements: None
Privileges Required: Low
User Interaction: None
Vulnerable system confidentiality: Low
Vulnerable system integrity: Low
Vulnerable system availability: Low
Subsequent system confidentiality: None
Subsequent system integrity: None
Subsequent system availability: None

Threat metrics

Exploit Maturity: POC

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Attack Requirements: None: The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.
Privileges Required: Low: The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction: None: The vulnerable system can be exploited without interaction from any human user, other than the attacker.
Vulnerable system confidentiality: Low: There is some loss of confidentiality. Access to some restricted information is obtained, but the attacker does not have control over what information is obtained, or the amount or kind of loss is limited. The information disclosure does not cause a direct, serious loss to the Vulnerable System.
Vulnerable system integrity: Low: Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact to the Vulnerable System.
Vulnerable system availability: Low: Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the Vulnerable System are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the Vulnerable System.
Subsequent system confidentiality: None: There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.
Subsequent system integrity: None: There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.
Subsequent system availability: None: There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.
Exploit Maturity: POC: Based on threat intelligence sources each of the following must apply: · Proof-of-concept is publicly available · No knowledge of reported attempts to exploit this vulnerability · No knowledge of publicly available solutions used to simplify attempts to exploit the vulnerability

Definitions: FIRST CVSS v4.0 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 5 Jan 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
milvus	Affected =2.6.0 =2.6.1 =2.6.2 =2.6.3 =2.6.4 =2.6.5 =2.6.6 =2.6.7	Fixed in–
GitHubmilvus-io/milvus`pkg:github/milvus-io/milvus`Other threats	Affected =2.6.0 =2.6.1 =2.6.2 =2.6.3 =2.6.4 =2.6.5 =2.6.6 =2.6.7	Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

1. Apply the official patch as soon as Milvus version 2.6.8 is released to remediate the vulnerability. 2. Until patching is possible, restrict network access to Milvus HTTP endpoints to trusted internal networks only, using firewalls or network segmentation. 3. Implement strict input validation and sanitization on all inputs to the expr.Exec function or any interfaces accepting 'code' arguments to prevent malicious payloads. 4. Monitor logs and network traffic for unusual or unexpected requests targeting the expr.Exec endpoint. 5. Employ runtime application self-protection (RASP) or web application firewalls (WAF) with custom rules to detect and block deserialization attack patterns. 6. Conduct regular security assessments and code reviews focusing on deserialization and input handling in Milvus deployments. 7. Educate DevOps and security teams about the risks of insecure deserialization and the importance of timely patching. 8. Consider isolating Milvus instances in containerized or sandboxed environments to limit potential damage from exploitation.

Description

A security vulnerability has been detected in milvus up to 2.6.7. This vulnerability affects the function expr.Exec of the file pkg/util/expr/expr.go of the component HTTP Endpoint. The manipulation of the argument code leads to deserialization. Remote exploitation of the attack is possible. The exploit has been disclosed publicly and may be used. A fix is planned for the next release 2.6.8.

Impact

The vulnerability could allow remote attackers to execute arbitrary code or manipulate data within Milvus instances, potentially leading to partial compromise of confidentiality, integrity, and availability of the vector database service. This could disrupt AI workloads, degrade service reliability, or expose sensitive data processed by Milvus. Organizations relying on Milvus for critical AI, search, or data analytics functions may experience operational disruptions or data breaches. Since the vulnerability requires no authentication or user interaction, attackers can exploit it remotely with relative ease, increasing the risk of widespread attacks. However, the impact is somewhat limited by the scope of affected components and the medium severity rating. Still, unpatched systems in production environments represent a significant risk, especially where Milvus is integrated into larger data pipelines or exposed to untrusted networks.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 23 Feb 2026, 23:06 UTC

Technical details

References

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