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CVE-2026-81521

Cross-database write retargeting via unvalidated dotted database name in Client.BulkWrite in the MongoDB Go Driver

7.1 High

The MongoDB Go Driver's client-level bulk write operation may accept a caller-supplied database name containing a reserved separator character without escaping it before the name is used to build the target namespace for the operation. An application that passes untrusted input as a database name could therefore have the write directed at a database and collection other than the ones it intended. Only the Client.BulkWrite API is affected.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
High
Availability
None

Exploit likelihood

0.24%Unchanged since Aug 28, 2026
90%50%10%1%

What each source reports

CVE List Score used 7.1

Cross-database write retargeting via unvalidated dotted database name in Client.BulkWrite in the MongoDB Go Driver

The MongoDB Go Driver's client-level bulk write operation may accept a caller-supplied database name containing a reserved separator character without escaping it before the name is used to build the target namespace for the operation. An application that passes untrusted input as a database name could therefore have the write directed at a database and collection other than the ones it intended. Only the Client.BulkWrite API is affected.

Record
CVE-2026-81521
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Weakness
CWE-99
Updated
2026-11-02
EUVDEUVD-2026-67205 7.1

The MongoDB Go Driver's client-level bulk write operation may accept a caller-supplied database name containing a reserved separator character without escaping it before the name is used to build the target namespace for the operation. An application that passes untrusted input as a database name could therefore have the write directed at a database and collection other than the ones it intended. Only the Client.BulkWrite API is affected.

Record
EUVD-2026-67205
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Updated
2026-11-02
NVD 7.1

The MongoDB Go Driver's client-level bulk write operation may accept a caller-supplied database name containing a reserved separator character without escaping it before the name is used to build the target namespace for the operation. An application that passes untrusted input as a database name could therefore have the write directed at a database and collection other than the ones it intended. Only the Client.BulkWrite API is affected.

Record
CVE-2026-81521
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Weakness
CWE-99
Updated
2026-11-02
OSV 7.1

Cross-database write retargeting via unvalidated dotted database name in Client.BulkWrite in the MongoDB Go Driver

The MongoDB Go Driver's client-level bulk write operation may accept a caller-supplied database name containing a reserved separator character without escaping it before the name is used to build the target namespace for the operation. An application that passes untrusted input as a database name could therefore have the write directed at a database and collection other than the ones it intended. Only the Client.BulkWrite API is affected.

Record
CVE-2026-81521
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Weakness
CWE-99
Updated
2026-11-02
OSVDEBIAN-CVE-2026-81521 7.1

The MongoDB Go Driver's client-level bulk write operation may accept a caller-supplied database name containing a reserved separator character without escaping it before the name is used to build the target namespace for the operation. An application that passes untrusted input as a database name could therefore have the write directed at a database and collection other than the ones it intended. Only the Client.BulkWrite API is affected.

Record
DEBIAN-CVE-2026-81521
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated
2026-11-02
OSVRHSA-2026:68334 8.8

Red Hat Security Advisory: Red Hat Edge Manager Version 1.1.4 Security Update

Record
RHSA-2026:68334
CVSS 3.1
8.8 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L
Updated
2026-11-02
Show 5 moreShow less
OSVUBUNTU-CVE-2026-81521 7.1

The MongoDB Go Driver's client-level bulk write operation may accept a caller-supplied database name containing a reserved separator character without escaping it before the name is used to build the target namespace for the operation. An application that passes untrusted input as a database name could therefore have the write directed at a database and collection other than the ones it intended. Only the Client.BulkWrite API is affected.

Record
UBUNTU-CVE-2026-81521
CVSS 4.0
7.1 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
CVSS 3.1
6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Updated
2026-11-02
OSVopenSUSE-SU-2026:11803-1 No score

alloy-1.19.2-1.1 on GA media

These are all security issues fixed in the alloy-1.19.2-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:11803-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:22032-1 No score

Security update for alloy

This update for alloy fixes the following issues:

  • CVE-2026-2303: go.mongodb.org/mongo-driver: mongo-go-driver has Heap Out-of-Bounds Read in GSSAPI Error Handling (bsc#1269861).
  • CVE-2026-37236: github.com/grpc-ecosystem/grpc-gateway/v2/runtime: client can override the HTTP method of a POST request through the X-HTTP-Method-Override header and bypass established access control (bsc#1277996).
  • CVE-2026-41178: go.opentelemetry.io/otel/baggage: no rejection of raw-length headers in baggage parsing allows for DoS via oversized inputs (bsc#1276742).
  • CVE-2026-45679: go.opentelemetry.io/obi: Redis error text is exported in span status messages and can lead to exfiltration of sensitive data (bsc#1267482).
  • CVE-2026-45680: go.opentelemetry.io/obi: unbounded BPF internal metrics replay can exhaust CPU and cause a DoS (bsc#1267483).
  • CVE-2026-45681: go.opentelemetry.io/obi: CPU-mismatch fallback uses 256-byte buffer with 8KB size and can cause OBI out-of-bounds reads to leak memory into telemetry (bsc#1267484).
  • CVE-2026-45683: go.opentelemetry.io/obi: Java TLS ioctl kprobe allows a user to point OBI at kernel memory and cause that memory to be copied into telemetry (bsc#1267486).
  • CVE-2026-45684: go.opentelemetry.io/obi: log enricher mishandled writev buffers and allows multi-segment calls to read and overwrite memory beyond the first segment (bsc#1267487).
  • CVE-2026-46600: golang.org/x/net/dns/dnsmessage: Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer (bsc#1272418).
  • CVE-2026-48496: opentelemetry-ebpf-profiler: Unprivileged process can trigger a denial of service on the ebpf-profiler agent (bsc#1268982).
  • CVE-2026-56852: golang.org/x/text/unicode/norm: infinite loop on truncated/invalid UTF-8 input (bsc#1272028).
  • CVE-2026-56854,CVE-2026-56855,CVE-2026-78662: golang.org/x/crypto/ssh: authentication bypass and deadlocks in the crypto/ssh library (bsc#1278671).
  • CVE-2026-71556: github.com/go-git/go-git/v5: Arbitrary file read/write via symbolic link resolution (bsc#1276982).
  • CVE-2026-71557: github.com/go-git/go-git/v5: Malicious reference names may modify files outside the reference storage (bsc#1276992).
  • CVE-2026-75889: arbitrary file reads due to the prometheus.operator.servicemonitors component allowing users who can modify ServiceMonitor resources in a watched namespace to specify an arbitrary local file through bearerTokenFile (bsc#1277429).
  • CVE-2026-81521: go.mongodb.org/mongo-driver: MongoDB Go Driver: Write redirection via unvalidated database name in Client.BulkWrite (bsc#1278693).
  • CVE-2026-89090: github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream: malformed EventStream response frames containing a crafted header value type byte outside the valid range can cause the host process to terminate (bsc#1280671).

Changes for alloy:

Update to version 1.19.2:

  • Remove withdrawn lib/pq CVEs from govulncheck
  • Add backticks to component name in generated doc output
  • BREAKING CHANGE: prometheus.operator.servicemonitors now rejects endpoints that reference local files by default. Set allow_arbitrary_file_access = true to preserve previous behavior.
  • prometheus.enrich: Support multi-label matching
  • prometheus.relabel: Add opt-in TTL cache mode
  • telemetry: Add new metrics for graph connections and pyroscope forwarded entries
  • database_observability: Exclude system schemas from MySQL health checks and redact query text in explain_plans
  • Add nop receiver to OTel Engine
  • Backport dependency upgrades to address GO-2026-6061
Record
openSUSE-SU-2026:22032-1
Updated
2026-11-02
OSVSUSE-SU-2026:24148-1 No score

Security update for alloy

This update for alloy fixes the following issues:

  • CVE-2026-2303: go.mongodb.org/mongo-driver: mongo-go-driver has Heap Out-of-Bounds Read in GSSAPI Error Handling (bsc#1269861).
  • CVE-2026-37236: github.com/grpc-ecosystem/grpc-gateway/v2/runtime: client can override the HTTP method of a POST request through the X-HTTP-Method-Override header and bypass established access control (bsc#1277996).
  • CVE-2026-41178: go.opentelemetry.io/otel/baggage: no rejection of raw-length headers in baggage parsing allows for DoS via oversized inputs (bsc#1276742).
  • CVE-2026-45679: go.opentelemetry.io/obi: Redis error text is exported in span status messages and can lead to exfiltration of sensitive data (bsc#1267482).
  • CVE-2026-45680: go.opentelemetry.io/obi: unbounded BPF internal metrics replay can exhaust CPU and cause a DoS (bsc#1267483).
  • CVE-2026-45681: go.opentelemetry.io/obi: CPU-mismatch fallback uses 256-byte buffer with 8KB size and can cause OBI out-of-bounds reads to leak memory into telemetry (bsc#1267484).
  • CVE-2026-45683: go.opentelemetry.io/obi: Java TLS ioctl kprobe allows a user to point OBI at kernel memory and cause that memory to be copied into telemetry (bsc#1267486).
  • CVE-2026-45684: go.opentelemetry.io/obi: log enricher mishandled writev buffers and allows multi-segment calls to read and overwrite memory beyond the first segment (bsc#1267487).
  • CVE-2026-46600: golang.org/x/net/dns/dnsmessage: Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer (bsc#1272418).
  • CVE-2026-48496: opentelemetry-ebpf-profiler: Unprivileged process can trigger a denial of service on the ebpf-profiler agent (bsc#1268982).
  • CVE-2026-56852: golang.org/x/text/unicode/norm: infinite loop on truncated/invalid UTF-8 input (bsc#1272028).
  • CVE-2026-56854,CVE-2026-56855,CVE-2026-78662: golang.org/x/crypto/ssh: authentication bypass and deadlocks in the crypto/ssh library (bsc#1278671).
  • CVE-2026-71556: github.com/go-git/go-git/v5: Arbitrary file read/write via symbolic link resolution (bsc#1276982).
  • CVE-2026-71557: github.com/go-git/go-git/v5: Malicious reference names may modify files outside the reference storage (bsc#1276992).
  • CVE-2026-75889: arbitrary file reads due to the prometheus.operator.servicemonitors component allowing users who can modify ServiceMonitor resources in a watched namespace to specify an arbitrary local file through bearerTokenFile (bsc#1277429).
  • CVE-2026-81521: go.mongodb.org/mongo-driver: MongoDB Go Driver: Write redirection via unvalidated database name in Client.BulkWrite (bsc#1278693).
  • CVE-2026-89090: github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream: malformed EventStream response frames containing a crafted header value type byte outside the valid range can cause the host process to terminate (bsc#1280671).

Changes for alloy:

Update to version 1.19.2:

  • Remove withdrawn lib/pq CVEs from govulncheck
  • Add backticks to component name in generated doc output
  • BREAKING CHANGE: prometheus.operator.servicemonitors now rejects endpoints that reference local files by default. Set allow_arbitrary_file_access = true to preserve previous behavior.
  • prometheus.enrich: Support multi-label matching
  • prometheus.relabel: Add opt-in TTL cache mode
  • telemetry: Add new metrics for graph connections and pyroscope forwarded entries
  • database_observability: Exclude system schemas from MySQL health checks and redact query text in explain_plans
  • Add nop receiver to OTel Engine
  • Backport dependency upgrades to address GO-2026-6061
Record
SUSE-SU-2026:24148-1
Updated
2026-11-02
OSVSUSE-SU-2026:4408-1 No score

Security update for alloy

This update for alloy fixes the following issues:

  • CVE-2026-2303: go.mongodb.org/mongo-driver: mongo-go-driver has Heap Out-of-Bounds Read in GSSAPI Error Handling (bsc#1269861).
  • CVE-2026-37236: github.com/grpc-ecosystem/grpc-gateway/v2/runtime: client can override the HTTP method of a POST request through the X-HTTP-Method-Override header and bypass established access control (bsc#1277996).
  • CVE-2026-41178: go.opentelemetry.io/otel/baggage: no rejection of raw-length headers in baggage parsing allows for DoS via oversized inputs (bsc#1276742).
  • CVE-2026-45679: go.opentelemetry.io/obi: Redis error text is exported in span status messages and can lead to exfiltration of sensitive data (bsc#1267482).
  • CVE-2026-45680: go.opentelemetry.io/obi: unbounded BPF internal metrics replay can exhaust CPU and cause a DoS (bsc#1267483).
  • CVE-2026-45681: go.opentelemetry.io/obi: CPU-mismatch fallback uses 256-byte buffer with 8KB size and can cause OBI out-of-bounds reads to leak memory into telemetry (bsc#1267484).
  • CVE-2026-45683: go.opentelemetry.io/obi: Java TLS ioctl kprobe allows a user to point OBI at kernel memory and cause that memory to be copied into telemetry (bsc#1267486).
  • CVE-2026-45684: go.opentelemetry.io/obi: log enricher mishandled writev buffers and allows multi-segment calls to read and overwrite memory beyond the first segment (bsc#1267487).
  • CVE-2026-46600: golang.org/x/net/dns/dnsmessage: Parsing an invalid SVCB or HTTPS RR can panic when the size of a parameter value overflows the message buffer (bsc#1272418).
  • CVE-2026-48496: opentelemetry-ebpf-profiler: Unprivileged process can trigger a denial of service on the ebpf-profiler agent (bsc#1268982).
  • CVE-2026-56852: golang.org/x/text/unicode/norm: infinite loop on truncated/invalid UTF-8 input (bsc#1272028).
  • CVE-2026-56854,CVE-2026-56855,CVE-2026-78662: golang.org/x/crypto/ssh: authentication bypass and deadlocks in the crypto/ssh library (bsc#1278671).
  • CVE-2026-71556: github.com/go-git/go-git/v5: Arbitrary file read/write via symbolic link resolution (bsc#1276982).
  • CVE-2026-71557: github.com/go-git/go-git/v5: Malicious reference names may modify files outside the reference storage (bsc#1276992).
  • CVE-2026-75889: arbitrary file reads due to the prometheus.operator.servicemonitors component allowing users who can modify ServiceMonitor resources in a watched namespace to specify an arbitrary local file through bearerTokenFile (bsc#1277429).
  • CVE-2026-81521: go.mongodb.org/mongo-driver: MongoDB Go Driver: Write redirection via unvalidated database name in Client.BulkWrite (bsc#1278693).
  • CVE-2026-89090: github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream: malformed EventStream response frames containing a crafted header value type byte outside the valid range can cause the host process to terminate (bsc#1280671).

Changes for alloy:

  • Update to version 1.19.2.
  • Update to version 1.19.1.
  • Update to version 1.19.0:
  • BREAKING CHANGE: prometheus.operator.servicemonitors now rejects endpoints that reference local files by default. Set allow_arbitrary_file_access = true to preserve previous behavior.
  • prometheus.enrich: Support multi-label matching
  • prometheus.relabel: Add opt-in TTL cache mode
  • telemetry: Add new metrics for graph connections and pyroscope forwarded entries
  • database_observability: Exclude system schemas from MySQL health checks and redact query text in explain_plans
  • Update to version 1.18.1:
  • Add nop receiver to OTel Engine
Record
SUSE-SU-2026:4408-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
golang-mongodb-mongo-driver
Debian:12
 All versions, plus listed versions
1.12.1+ds1-11.12.1+ds1-21.16.1+ds1-11.17.0+ds1-11.17.1+ds1-1
Show 4 moreShow less
1.17.1+ds1-21.17.1+ds1-31.17.9+ds1-11.8.4+ds1-3
 None known
golang-mongodb-mongo-driver
Debian:13
 All versions, plus listed versions
1.17.1+ds1-21.17.1+ds1-31.17.9+ds1-1
 None known
golang-mongodb-mongo-driver
Debian:14
 All versions, plus listed versions
1.17.1+ds1-21.17.1+ds1-31.17.9+ds1-1
 None known
flightctl
Red Hat:edge_manager:1.1::el10
From an advisory covering 23 CVEs
 before 0:1.1.4-1.el10em
0:1.1.4-1.el10em
flightctl-agent
Red Hat:edge_manager:1.1::el10
From an advisory covering 23 CVEs
 before 0:1.1.4-1.el10em
0:1.1.4-1.el10em
flightctl-cli
Red Hat:edge_manager:1.1::el10
From an advisory covering 23 CVEs
 before 0:1.1.4-1.el10em
0:1.1.4-1.el10em
flightctl
Red Hat:edge_manager:1.1::el9
From an advisory covering 23 CVEs
 before 0:1.1.4-1.el9em
0:1.1.4-1.el9em
flightctl-agent
Red Hat:edge_manager:1.1::el9
From an advisory covering 23 CVEs
 before 0:1.1.4-1.el9em
0:1.1.4-1.el9em
flightctl-cli
Red Hat:edge_manager:1.1::el9
From an advisory covering 23 CVEs
 before 0:1.1.4-1.el9em
0:1.1.4-1.el9em
alloy
SUSE:Linux Enterprise Server 16.0
From an advisory covering 19 CVEs
 before 1.19.2-160000.1.1
1.19.2-160000.1.1
Show 7 moreShow less
Affected packages
PackageAffectedFixed
alloy
SUSE:Linux Enterprise Server for SAP applications 16.0
From an advisory covering 19 CVEs
 before 1.19.2-160000.1.1
1.19.2-160000.1.1
alloy
SUSE:Linux Enterprise Module for Basesystem 15 SP7
From an advisory covering 19 CVEs
 before 1.19.2-150700.15.29.1
1.19.2-150700.15.29.1
golang-mongodb-mongo-driver
Ubuntu:24.04:LTS
 All versions, plus listed versions
1.8.4+ds1-1ubuntu11.12.1+ds1-2
 None known
golang-mongodb-mongo-driver
Ubuntu:26.10
 All versions, plus listed versions
1.17.1+ds1-21.17.9+ds1-1
 None known
golang-mongodb-mongo-driver
Ubuntu:26.04:LTS
 All versions, plus listed versions
1.17.1+ds1-2
 None known
alloy
openSUSE:Tumbleweed
From an advisory covering 18 CVEs
 before 1.19.2-1.1
1.19.2-1.1
alloy
openSUSE:Leap 16.0
From an advisory covering 19 CVEs
 before 1.19.2-160000.1.1
1.19.2-160000.1.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-81521 is a high vulnerability (CVSS 7.1) in Mongodb Go Driver, published August 27, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.24%, the 14th percentile. No source names a fixed version.

References

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Left out here: 5 references. The JSON record has them.

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