CVE-2026-105163
crossplane crossplane-runtime ImageConfig client.go Get toctou
A vulnerability was detected in crossplane crossplane-runtime up to 2.2.2/2.3.2. This vulnerability affects the function Get of the file pkg/xpkg/client.go of the component ImageConfig. The manipulation results in time-of-check time-of-use. The attack may be launched remotely. Upgrading to version 2.2.3, 2.3.3 and 2.4.0-rc.1 is able to resolve this issue. The patch is identified as bee99c6cd6ca81878acca2940a2f0a02169fc208. You should upgrade the affected component.
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
- None
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
crossplane crossplane-runtime ImageConfig client.go Get toctou
A vulnerability was detected in crossplane crossplane-runtime up to 2.2.2/2.3.2. This vulnerability affects the function Get of the file pkg/xpkg/client.go of the component ImageConfig. The manipulation results in time-of-check time-of-use. The attack may be launched remotely. Upgrading to version 2.2.3, 2.3.3 and 2.4.0-rc.1 is able to resolve this issue. The patch is identified as bee99c6cd6ca81878acca2940a2f0a02169fc208. You should upgrade the affected component.
- Record
CVE-2026-105163- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X - CVSS 3.1
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:X/RL:O/RC:C - CVSS 3.0
- 5.3 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:X/RL:O/RC:C - CVSS 2.0
- 5.0
AV:N/AC:L/Au:N/C:N/I:P/A:N/E:ND/RL:OF/RC:C - Weakness
- CWE-367, CWE-362
- Updated
- 2026-11-02
EUVDEUVD-2026-92128
A vulnerability was detected in crossplane crossplane-runtime up to 2.2.2/2.3.2. This vulnerability affects the function Get of the file pkg/xpkg/client.go of the component ImageConfig. The manipulation results in time-of-check time-of-use. The attack may be launched remotely. Upgrading to version 2.2.3, 2.3.3 and 2.4.0-rc.1 is able to resolve this issue. The patch is identified as bee99c6cd6ca81878acca2940a2f0a02169fc208. You should upgrade the affected component.
- Record
EUVD-2026-92128- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-92mr-7mjc-w93g
A vulnerability was detected in crossplane crossplane-runtime up to 2.2.2/2.3.2. This...
A vulnerability was detected in crossplane crossplane-runtime up to 2.2.2/2.3.2. This vulnerability affects the function Get of the file pkg/xpkg/client.go of the component ImageConfig. The manipulation results in time-of-check time-of-use. The attack may be launched remotely. Upgrading to version 2.2.3, 2.3.3 and 2.4.0-rc.1 is able to resolve this issue. The patch is identified as bee99c6cd6ca81878acca2940a2f0a02169fc208. You should upgrade the affected component.
- Record
GHSA-92mr-7mjc-w93g- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/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
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - Weakness
- CWE-362
- Updated
- 2026-11-02
GitHub AdvisoriesGHSA-mf7q-r4rv-jv94
Crossplane's TOCTOU between cosign verification and image fetch in xpkg.CachedClient allows tag-based package install to bypass signature check
Summary
Crossplane allows package signature verification to be configured via the ImageConfig mechanism. When enabled, the package manager uses cosign to verify that packages are correctly signed before pulling and installing them.
When a package is installed using a tag reference (e.g., a semantic version), a malicious OCI registry could serve a correctly signed image for verification, then subsequently serve an unsigned image for installation. This is possible because Crossplane resolves the tag reference separately for each step.
This vulnerability is relevant only for users who do all three of the following:
- Configure signature verification for packages,
- Install packages using tag references rather than digests, and
- Install packages from registries they do not control.
Mitigation
Installing packages by image digest rather than using tags avoids this issue.
Fix
The package manager has been updated to resolve tag references once and use the resulting digest for both signature verification and image fetching. This ensures that Crossplane pulls the same content that had its signature verified. The fix has been applied to Crossplane's main branch and backported to the v2.3 and v2.2 release branches; it will be released in v2.3.3 and v2.2.3.
Credits
This issue was reported, independently, by @bugbunny-research and @tonghuaroot.
- Record
GHSA-mf7q-r4rv-jv94- CVSS 4.0
- 8.2 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-345, CWE-367
- Updated
- 2026-11-02
NVD
A vulnerability was detected in crossplane crossplane-runtime up to 2.2.2/2.3.2. This vulnerability affects the function Get of the file pkg/xpkg/client.go of the component ImageConfig. The manipulation results in time-of-check time-of-use. The attack may be launched remotely. Upgrading to version 2.2.3, 2.3.3 and 2.4.0-rc.1 is able to resolve this issue. The patch is identified as bee99c6cd6ca81878acca2940a2f0a02169fc208. You should upgrade the affected component.
- Record
CVE-2026-105163- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/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
- 5.3 Medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:P/A:N - Weakness
- CWE-362, CWE-367
- Updated
- 2026-11-02
OSV
crossplane crossplane-runtime ImageConfig client.go Get toctou
A vulnerability was detected in crossplane crossplane-runtime up to 2.2.2/2.3.2. This vulnerability affects the function Get of the file pkg/xpkg/client.go of the component ImageConfig. The manipulation results in time-of-check time-of-use. The attack may be launched remotely. Upgrading to version 2.2.3, 2.3.3 and 2.4.0-rc.1 is able to resolve this issue. The patch is identified as bee99c6cd6ca81878acca2940a2f0a02169fc208. You should upgrade the affected component.
- Record
CVE-2026-105163- CVSS 4.0
- 6.9 Medium
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X - Weakness
- CWE-362, CWE-367
- Updated
- 2026-11-02
OSVGHSA-mf7q-r4rv-jv94
Crossplane's TOCTOU between cosign verification and image fetch in xpkg.CachedClient allows tag-based package install to bypass signature check
Summary
Crossplane allows package signature verification to be configured via the ImageConfig mechanism. When enabled, the package manager uses cosign to verify that packages are correctly signed before pulling and installing them.
When a package is installed using a tag reference (e.g., a semantic version), a malicious OCI registry could serve a correctly signed image for verification, then subsequently serve an unsigned image for installation. This is possible because Crossplane resolves the tag reference separately for each step.
This vulnerability is relevant only for users who do all three of the following:
- Configure signature verification for packages,
- Install packages using tag references rather than digests, and
- Install packages from registries they do not control.
Mitigation
Installing packages by image digest rather than using tags avoids this issue.
Fix
The package manager has been updated to resolve tag references once and use the resulting digest for both signature verification and image fetching. This ensures that Crossplane pulls the same content that had its signature verified. The fix has been applied to Crossplane's main branch and backported to the v2.3 and v2.2 release branches; it will be released in v2.3.3 and v2.2.3.
Credits
This issue was reported, independently, by @bugbunny-research and @tonghuaroot.
- Record
GHSA-mf7q-r4rv-jv94- CVSS 4.0
- 8.2 High
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N - Weakness
- CWE-345, CWE-367
- Updated
- 2026-11-02
OSVGO-2026-6302 No score
Signature verification TOCTOU allows installing unverified package content in github.com/crossplane/crossplane-runtime/v2
Signature verification TOCTOU allows installing unverified package content in github.com/crossplane/crossplane-runtime/v2
- Record
GO-2026-6302- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
github.com/crossplane/crossplane-runtime/v2Go |
2.4.0-rc.0 to 2.4.0-rc.0 | 2.4.0-rc.1 |
github.com/crossplane/crossplane-runtime/v2Go |
2.3.0 to 2.3.2 | 2.3.3 |
github.com/crossplane/crossplane-runtime/v2Go |
2.4.0-rc.0 up to 2.4.0-rc.1 | 2.4.0-rc.1 |
github.com/crossplane/crossplane-runtime/v2Go |
2.3.0 up to 2.3.3 | 2.3.3 |
github.com/crossplane/crossplane-runtime/v2Go |
2.3.0 up to 2.3.3, 2.4.0-rc.0 up to 2.4.0-rc.1 | 2.3.32.4.0-rc.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-105163 is a medium vulnerability (CVSS 6.9) in Crossplane Crossplane-runtime, published August 27, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.32%, the 25th percentile. Fixed in github.com/crossplane/crossplane-runtime/v2 2.4.0-rc.1.
References
vuldb.com/vuln/413395
github.com/advisories/GHSA-mf7q-r4rv-jv94
Show 7 moreShow less
nvd.nist.gov/vuln/detail/CVE-2026-105163