CVE catalog
CVE-2026-39395
Cosign provides code signing and transparency for containers and binaries. Prior to 3.0.6 and 2.6.3, cosign verify-blob-attestation may erroneously report a "Verified OK" result for attestations with
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.24% · Oct 25, 2026
A flaw was found in Cosign, a tool for code signing and transparency for containers and binaries. A remote attacker could exploit this vulnerability by providing malformed payloads or attestations with mismatched predicate types. This could lead to Cosign erroneously reporting a "Verified OK" result, even when the attestations are invalid. This issue compromises the integrity of the verification process, potentially allowing unverified software to be trusted. github.com/sigstore/cosign: Cosign: Incorrect attestation verification due to malformed payloads or mismatched predicate types The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Cpe | cosign | Not reported | 2.6.3 | fixed |
| Cpe | cosign | Not reported | 3.0.6 | fixed |
| Debian | cosign | 13 | 2.5.0-2 | vulnerable |
| Debian | cosign | 13 | 2.6.2-1 | vulnerable |
| Debian | cosign | 13 | 2.6.2-1~exp0 | vulnerable |
| Debian | cosign | 13 | 2.6.3-1 | vulnerable |
| Debian | cosign | 13 | 3.0.5-1~exp0 | vulnerable |
| Debian | cosign | 13 | 3.0.6-1 | vulnerable |
| Debian | cosign | 13 | 3.0.6-1~exp0 | vulnerable |
| Debian | cosign | 13 | 3.1.0-1~exp0 | vulnerable |
| Debian | cosign | 13 | 3.1.1-1 | vulnerable |
| Debian | cosign | 13 | 3.1.1-1~exp0 | vulnerable |
| Debian | cosign | 14 | 2.5.0-2 | vulnerable |
| Debian | cosign | 14 | 2.6.2-1 | vulnerable |
| Debian | cosign | 14 | 2.6.2-1~exp0 | vulnerable |
| Debian | cosign | 14 | 2.6.3-1 | fixed |
| Suse | cosign | linux enterprise server 16.0 | 3.0.6-160000.1.1 | fixed |
| Suse | cosign | linux enterprise server for sap applications 16.0 | 3.0.6-160000.1.1 | fixed |
| Opensuse | cosign | leap 16.0 | 3.0.6-160000.1.1 | fixed |
| Suse | cosign | linux enterprise module for basesystem 15 sp7 | 3.0.6-150400.3.42.1 | fixed |
| Opensuse | cosign | tumbleweed | 3.0.6-1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Cpe | cosign | cpe | Not reported | 2.6.3 | Not reported | Not reported | Not reported |
| Cpe | cosign | cpe | Not reported | 3.0.6 | Not reported | Not reported | Not reported |
| Debian | cosign | deb | 14 | 2.6.3-1 | Not reported | DEBIAN-CVE-2026-39395 | Not reported |
| Suse | cosign | rpm | linux enterprise server 16.0 | 3.0.6-160000.1.1 | Not reported | SUSE-SU-2026:22344-1 | Not reported |
| Suse | cosign | rpm | linux enterprise server for sap applications 16.0 | 3.0.6-160000.1.1 | Not reported | SUSE-SU-2026:22344-1 | Not reported |
| Opensuse | cosign | rpm | leap 16.0 | 3.0.6-160000.1.1 | Not reported | OPENSUSE-SU-2026:21036-1 | Not reported |
| Suse | cosign | rpm | linux enterprise module for basesystem 15 sp7 | 3.0.6-150400.3.42.1 | Not reported | SUSE-SU-2026:2365-1 | Not reported |
| Opensuse | cosign | rpm | tumbleweed | 3.0.6-1.1 | Not reported | OPENSUSE-SU-2026:10753-1 | Not reported |
OpenFactory catalog packages
[Debian 13 (Trixie)]
- [cosign]Affected
Source package: [cosign]
Details (2)
2.5.0-2+b4· amd64 · trixieAffected
nvd · cosign · debian · 13
2.5.0-2+b4· arm64 · trixieAffected
nvd · cosign · debian · 13
- [golang-github-sigstore-cosign-dev]Affected
Source package: [cosign]
Details (2)
2.5.0-2· all · trixieAffected
nvd · cosign · debian · 13
2.5.0-2· all · trixieAffected
nvd · cosign · debian · 13
[openSUSE Tumbleweed]
- [cosign-bash-completion]Unknown
Source package: [cosign]
Details (1)
3.1.2-1.2· noarch · tumbleweedUnknown · Fixed:
3.0.6-1.1Version impact unknown
nvd · cosign · opensuse · tumbleweed
- [cosign-fish-completion]Unknown
Source package: [cosign]
Details (1)
3.1.2-1.2· noarch · tumbleweedUnknown · Fixed:
3.0.6-1.1Version impact unknown
nvd · cosign · opensuse · tumbleweed
- [cosign-zsh-completion]Unknown
Source package: [cosign]
Details (1)
3.1.2-1.2· noarch · tumbleweedUnknown · Fixed:
3.0.6-1.1Version impact unknown
nvd · cosign · opensuse · tumbleweed
- [cosign]Fixed
Source package: [cosign]
Details (1)
3.1.2-1.2· x86_64 · tumbleweedFixed · Fixed:
3.0.6-1.1nvd · cosign · opensuse · tumbleweed
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/opensuse-su-2026_10753-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-39395]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-39395]
- [https://osv.dev/vulnerability/SUSE-SU-2026:22344-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:2365-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10753-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:21036-1]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-39395.json]
[FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]