CVE-2025-27817
Apache Kafka Client: Arbitrary file read and SSRF vulnerability
A possible arbitrary file read and SSRF vulnerability has been identified in Apache Kafka Client. Apache Kafka Clients accept configuration data for setting the SASL/OAUTHBEARER connection with the brokers, including "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url". Apache Kafka allows clients to read an arbitrary file and return the content in the error log, or sending requests to an unintended location. In applications where Apache Kafka Clients configurations can be specified by an untrusted party, attackers may use the "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url" configuratin to read arbitrary contents of the disk and environment variables or make requests to an unintended location. In particular, this flaw may be used in Apache Kafka Connect to escalate from REST API access to filesystem/environment/URL access, which may be undesirable in certain environments, including SaaS products.
Since Apache Kafka 3.9.1/4.0.0, we have added a system property ("-Dorg.apache.kafka.sasl.oauthbearer.allowed.urls") to set the allowed urls in SASL JAAS configuration. In 3.9.1, it accepts all urls by default for backward compatibility. However in 4.0.0 and newer, the default value is empty list and users have to set the allowed urls explicitly.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Apache Kafka Client: Arbitrary file read and SSRF vulnerability
A possible arbitrary file read and SSRF vulnerability has been identified in Apache Kafka Client. Apache Kafka Clients accept configuration data for setting the SASL/OAUTHBEARER connection with the brokers, including "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url". Apache Kafka allows clients to read an arbitrary file and return the content in the error log, or sending requests to an unintended location. In applications where Apache Kafka Clients configurations can be specified by an untrusted party, attackers may use the "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url" configuratin to read arbitrary contents of the disk and environment variables or make requests to an unintended location. In particular, this flaw may be used in Apache Kafka Connect to escalate from REST API access to filesystem/environment/URL access, which may be undesirable in certain environments, including SaaS products.
Since Apache Kafka 3.9.1/4.0.0, we have added a system property ("-Dorg.apache.kafka.sasl.oauthbearer.allowed.urls") to set the allowed urls in SASL JAAS configuration. In 3.9.1, it accepts all urls by default for backward compatibility. However in 4.0.0 and newer, the default value is empty list and users have to set the allowed urls explicitly.
- Record
CVE-2025-27817- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-918
- Updated
- 2026-11-02
EUVDEUVD-2025-17640
A possible arbitrary file read and SSRF vulnerability has been identified in Apache Kafka Client. Apache Kafka Clients accept configuration data for setting the SASL/OAUTHBEARER connection with the brokers, including "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url". Apache Kafka allows clients to read an arbitrary file and return the content in the error log, or sending requests to an unintended location. In applications where Apache Kafka Clients configurations can be specified by an untrusted party, attackers may use the "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url" configuratin to read arbitrary contents of the disk and environment variables or make requests to an unintended location. In particular, this flaw may be used in Apache Kafka Connect to escalate from REST API access to filesystem/environment/URL access, which may be undesirable in certain environments, including SaaS products.
Since Apache Kafka 3.9.1/4.0.0, we have added a system property ("-Dorg.apache.kafka.sasl.oauthbearer.allowed.urls") to set the allowed urls in SASL JAAS configuration. In 3.9.1, it accepts all urls by default for backward compatibility. However in 4.0.0 and newer, the default value is empty list and users have to set the allowed urls explicitly.
- Record
EUVD-2025-17640- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-vgq5-3255-v292
Apache Kafka Client Arbitrary File Read and Server Side Request Forgery Vulnerability
A possible arbitrary file read and SSRF vulnerability has been identified in Apache Kafka Client. Apache Kafka Clients accept configuration data for setting the SASL/OAUTHBEARER connection with the brokers, including "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url". Apache Kafka allows clients to read an arbitrary file and return the content in the error log, or sending requests to an unintended location. In applications where Apache Kafka Clients configurations can be specified by an untrusted party, attackers may use the "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url" configuratin to read arbitrary contents of the disk and environment variables or make requests to an unintended location. In particular, this flaw may be used in Apache Kafka Connect to escalate from REST API access to filesystem/environment/URL access, which may be undesirable in certain environments, including SaaS products.
Since Apache Kafka 3.9.1/4.0.0, we have added a system property ("-Dorg.apache.kafka.sasl.oauthbearer.allowed.urls") to set the allowed urls in SASL JAAS configuration. In 3.9.1, it accepts all urls by default for backward compatibility. However in 4.0.0 and newer, the default value is empty list and users have to set the allowed urls explicitly.
- Record
GHSA-vgq5-3255-v292- CVSS 4.0
- 6.2 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-918
- Updated
- 2026-11-02
NVD
A possible arbitrary file read and SSRF vulnerability has been identified in Apache Kafka Client. Apache Kafka Clients accept configuration data for setting the SASL/OAUTHBEARER connection with the brokers, including "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url". Apache Kafka allows clients to read an arbitrary file and return the content in the error log, or sending requests to an unintended location. In applications where Apache Kafka Clients configurations can be specified by an untrusted party, attackers may use the "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url" configuratin to read arbitrary contents of the disk and environment variables or make requests to an unintended location. In particular, this flaw may be used in Apache Kafka Connect to escalate from REST API access to filesystem/environment/URL access, which may be undesirable in certain environments, including SaaS products.
Since Apache Kafka 3.9.1/4.0.0, we have added a system property ("-Dorg.apache.kafka.sasl.oauthbearer.allowed.urls") to set the allowed urls in SASL JAAS configuration. In 3.9.1, it accepts all urls by default for backward compatibility. However in 4.0.0 and newer, the default value is empty list and users have to set the allowed urls explicitly.
- Record
CVE-2025-27817- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-918
- Updated
- 2026-11-02
OSV
Apache Kafka Client: Arbitrary file read and SSRF vulnerability
A possible arbitrary file read and SSRF vulnerability has been identified in Apache Kafka Client. Apache Kafka Clients accept configuration data for setting the SASL/OAUTHBEARER connection with the brokers, including "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url". Apache Kafka allows clients to read an arbitrary file and return the content in the error log, or sending requests to an unintended location. In applications where Apache Kafka Clients configurations can be specified by an untrusted party, attackers may use the "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url" configuratin to read arbitrary contents of the disk and environment variables or make requests to an unintended location. In particular, this flaw may be used in Apache Kafka Connect to escalate from REST API access to filesystem/environment/URL access, which may be undesirable in certain environments, including SaaS products.
Since Apache Kafka 3.9.1/4.0.0, we have added a system property ("-Dorg.apache.kafka.sasl.oauthbearer.allowed.urls") to set the allowed urls in SASL JAAS configuration. In 3.9.1, it accepts all urls by default for backward compatibility. However in 4.0.0 and newer, the default value is empty list and users have to set the allowed urls explicitly.
- Record
CVE-2025-27817- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVGHSA-vgq5-3255-v292
Apache Kafka Client Arbitrary File Read and Server Side Request Forgery Vulnerability
A possible arbitrary file read and SSRF vulnerability has been identified in Apache Kafka Client. Apache Kafka Clients accept configuration data for setting the SASL/OAUTHBEARER connection with the brokers, including "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url". Apache Kafka allows clients to read an arbitrary file and return the content in the error log, or sending requests to an unintended location. In applications where Apache Kafka Clients configurations can be specified by an untrusted party, attackers may use the "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url" configuratin to read arbitrary contents of the disk and environment variables or make requests to an unintended location. In particular, this flaw may be used in Apache Kafka Connect to escalate from REST API access to filesystem/environment/URL access, which may be undesirable in certain environments, including SaaS products.
Since Apache Kafka 3.9.1/4.0.0, we have added a system property ("-Dorg.apache.kafka.sasl.oauthbearer.allowed.urls") to set the allowed urls in SASL JAAS configuration. In 3.9.1, it accepts all urls by default for backward compatibility. However in 4.0.0 and newer, the default value is empty list and users have to set the allowed urls explicitly.
- Record
GHSA-vgq5-3255-v292- CVSS 4.0
- 6.2 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-918
- Updated
- 2026-11-02
Show 6 moreShow less
OSVRHLW-2026-f7c61b4b79130a3c
Lightwell Security Advisory: kafka-clients 3.6.2.rhlw-00004
Red Hat Lightwell has released org.apache.kafka:kafka-clients 3.6.2.rhlw-00004 with backported fixes for CVE-2024-31141, CVE-2025-27817, CVE-2026-33558, and CVE-2026-35554.
CVE-2024-31141: Apache Kafka Clients: Privilege escalation to filesystem read-access via automatic ConfigProvider
CVE-2025-27817: Apache Kafka Client: Arbitrary file read and SSRF vulnerability
CVE-2026-33558: Apache Kafka, Apache Kafka Clients: Information Exposure Through Network Client Log Output
CVE-2026-35554: Apache Kafka Clients: Kafka Producer Message Corruption and Misrouting via Buffer Pool Race Condition
This patched artifact is a drop-in replacement for org.apache.kafka:kafka-clients 3.6.2 from Maven Central.
- Record
RHLW-2026-f7c61b4b79130a3c- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVROOT-APP-MAVEN-CVE-2025-27817
CVE-2025-27817 in io.root.org.apache.kafka:kafka-clients - Patched by Root
Root has patched CVE-2025-27817 in the io.root.org.apache.kafka:kafka-clients package for Root:Maven. Multiple fixed versions available.
- Record
ROOT-APP-MAVEN-CVE-2025-27817- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N - Updated
- 2026-11-02
OSVBIT-kafka-2025-27817 No score
Apache Kafka Client: Arbitrary file read and SSRF vulnerability
A possible arbitrary file read and SSRF vulnerability has been identified in Apache Kafka Client. Apache Kafka Clients accept configuration data for setting the SASL/OAUTHBEARER connection with the brokers, including "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url". Apache Kafka allows clients to read an arbitrary file and return the content in the error log, or sending requests to an unintended location. In applications where Apache Kafka Clients configurations can be specified by an untrusted party, attackers may use the "sasl.oauthbearer.token.endpoint.url" and "sasl.oauthbearer.jwks.endpoint.url" configuratin to read arbitrary contents of the disk and environment variables or make requests to an unintended location. In particular, this flaw may be used in Apache Kafka Connect to escalate from REST API access to filesystem/environment/URL access, which may be undesirable in certain environments, including SaaS products.
Since Apache Kafka 3.9.1/4.0.0, we have added a system property ("-Dorg.apache.kafka.sasl.oauthbearer.allowed.urls") to set the allowed urls in SASL JAAS configuration. In 3.9.1, it accepts all urls by default for backward compatibility. However in 4.0.0 and newer, the default value is empty list and users have to set the allowed urls explicitly.
- Record
BIT-kafka-2025-27817- Updated
- 2026-11-02
OSVCLSA-2025-1752019395 No score
TuxCare security update for org.apache.kafka (5 CVEs)
TuxCare rebuilt 3 org.apache.kafka packages to address 5 CVEs. Fixed in 3.2.3.tuxcare.1.
- Record
CLSA-2025-1752019395- Updated
- 2026-11-02
OSVCLSA-2026-1783991065 No score
TuxCare security update for org.apache.kafka:kafka-clients (2 CVEs)
TuxCare rebuilt org.apache.kafka:kafka-clients to address 2 CVEs. Fixed in 3.7.1-tuxcare.1.
- Record
CLSA-2026-1783991065- Updated
- 2026-11-02
OSVCLSA-2026-1789425652 No score
TuxCare security update for org.apache.kafka:kafka-clients (1 CVE)
TuxCare rebuilt org.apache.kafka:kafka-clients to address 1 CVE. Fixed in 3.2.2-tuxcare.1.
- Record
CLSA-2026-1789425652- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
org.apache.kafka:kafka-clientsMaven |
3.1.0 up to 3.9.1 | 3.9.1 |
kafkaBitnami |
3.1.0 up to 3.9.1 | 3.9.1 |
org.apache.kafka:kafka-clientsTuxCare:Maven From an advisory covering 5 CVEs |
3.2.3 up to 3.2.3.tuxcare.1, plus listed versions 3.2.3.tuxcare |
3.2.3.tuxcare.1 |
org.apache.kafka:kafka_2.12TuxCare:Maven From an advisory covering 5 CVEs |
3.2.3 up to 3.2.3.tuxcare.1, plus listed versions 3.2.3.tuxcare |
3.2.3.tuxcare.1 |
org.apache.kafka:kafka_2.13TuxCare:Maven From an advisory covering 5 CVEs |
3.2.3 up to 3.2.3.tuxcare.1, plus listed versions 3.2.3.tuxcare |
3.2.3.tuxcare.1 |
org.apache.kafka:kafka-clientsTuxCare:Maven From an advisory covering 2 CVEs |
3.7.1 up to 3.7.1-tuxcare.1 | 3.7.1-tuxcare.1 |
org.apache.kafka:kafka-clientsTuxCare:Maven |
3.2.2 up to 3.2.2-tuxcare.1 | 3.2.2-tuxcare.1 |
org.apache.kafka:kafka-clientsMaven |
3.1.0 up to 3.9.1, plus listed versions 3.1.13.1.23.2.03.2.13.2.2 Show 18 moreShow less3.2.33.3.03.3.13.3.23.4.03.4.13.5.03.5.13.5.23.6.03.6.13.6.23.7.03.7.13.7.23.8.03.8.13.9.0 |
3.9.1 |
org.apache.kafka:kafka-clientsRed Hat Lightwell:Maven From an advisory covering 4 CVEs |
before 3.6.2.rhlw-00004, plus listed versions 0.10.0.00.10.0.10.10.1.00.10.1.10.10.2.0 Show 45 moreShow less0.10.2.10.10.2.20.11.0.00.11.0.10.11.0.20.11.0.30.8.2-beta0.8.2.00.8.2.10.8.2.20.9.0.00.9.0.11.0.01.0.11.0.21.1.01.1.12.0.02.0.12.1.02.1.12.2.02.2.12.2.22.3.02.3.12.4.02.4.12.5.02.5.12.6.02.6.12.6.22.6.32.7.02.7.12.7.22.8.02.8.12.8.23.0.03.0.13.0.23.1.03.1.1 |
3.6.2.rhlw-00004 |
io.root.org.apache.kafka:kafka-clientsRoot:Maven |
before 3.6.0-root.io.1 | 3.6.0-root.io.13.8.1-root.io.13.7.1-root.io.13.8.1-root.io.23.6.0-root.io.23.6.0-root.io.33.7.1-root.io.23.8.1-root.io.33.7.1-root.io.33.8.1-root.io.43.9.1-root.io.13.9.1-root.io.23.9.1-root.io.33.9.1-root.io.4 |
org.apache.kafka:kafka-clientsRoot:Maven |
before 3.6.0-aikido.3 | 3.6.0-aikido.33.7.1-aikido.23.8.1-aikido.33.7.1-aikido.33.8.1-aikido.43.9.1-aikido.4 |
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| PoC in GitHub | iSee857/CVE-2025-27817 | 2025-07-04 |
| PoC in GitHub | oriolrius/kafka-keycloak-oauth | 2025-10-13 |
| Nuclei | Apache Kafka Client - Arbitrary File Read |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, exploits, facts | ||
| first indexed | CVE List, EUVD, GitHub Advisories, Nuclei, NVD, OSV, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2025-27817 is a high vulnerability (CVSS 7.5) in Apache Kafka, published June 10, 2025. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 69.8%, the 99th percentile. Fixed in org.apache.kafka:kafka-clients 3.9.1.
References
kafka.apache.org/cve-list
openwall.com/lists/oss-security/2025/06/09/1
nvd.nist.gov/vuln/detail/CVE-2025-27817
github.com/advisories/GHSA-vgq5-3255-v292
Show 14 moreShow less
repo.maven.apache.org/maven2
lists.apache.org/thread/9whdzfr0zwdhr364604w5ssnzmg4v2lv
issues.apache.org/jira/browse/KAFKA-19012
Left out here: 16 versions. The JSON record has them.