CVE-2026-22703

mediumpriority · track · 22OT risk · elevatedEPSS 0.001 · 1 %ileDEEUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.11% (1st) EPSS
CVSS 5.5 · medium
Is it mine?
9 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · osv · nvd

EPSS · scored 2026-10-27

Cosign provides code signing and transparency for containers and binaries. Prior to versions 2.6.2 and 3.0.4, Cosign bundle can be crafted to successfully verify an artifact even if the embedded Rekor entry does not reference the artifact's digest, signature or public key. When verifying a Rekor entry, Cosign verifies the Rekor entry signature, and also compares the artifact's digest, the user's public key from either a Fulcio certificate or provided by the user, and the artifact signature to the Rekor entry contents. Without these comparisons, Cosign would accept any response from Rekor as valid. A malicious actor that has compromised a user's identity or signing key could construct a valid Cosign bundle by including any arbitrary Rekor entry, thus preventing the user from being able to audit the signing event. This issue has been patched in versions 2.6.2 and 3.0.4.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • Fixedcosign-0:3.0.5-150400.3.35.1.aarch64 as component of SUSE Linux Enterprise Module for Basesystem 15 SP7suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-150400.3.35.1.aarch64 as component of openSUSE Leap 15.6suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-150400.3.35.1.ppc64le as component of SUSE Linux Enterprise Module for Basesystem 15 SP7suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-150400.3.35.1.ppc64le as component of openSUSE Leap 15.6suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-150400.3.35.1.s390x as component of SUSE Linux Enterprise Module for Basesystem 15 SP7suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-150400.3.35.1.s390x as component of openSUSE Leap 15.6suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-150400.3.35.1.x86_64 as component of SUSE Linux Enterprise Module for Basesystem 15 SP7suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-150400.3.35.1.x86_64 as component of openSUSE Leap 15.6suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-bash-completion-0:3.0.5-150400.3.35.1.noarch as component of SUSE Linux Enterprise Module for Basesystem 15 SP7suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-zsh-completion-0:3.0.5-150400.3.35.1.noarch as component of SUSE Linux Enterprise Module for Basesystem 15 SP7suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-160000.1.1.aarch64 as component of SUSE Linux Enterprise Server 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-160000.1.1.aarch64 as component of SUSE Linux Enterprise Server for SAP applications 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-160000.1.1.ppc64le as component of SUSE Linux Enterprise Server 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-160000.1.1.ppc64le as component of SUSE Linux Enterprise Server for SAP applications 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-160000.1.1.s390x as component of SUSE Linux Enterprise Server 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-160000.1.1.s390x as component of SUSE Linux Enterprise Server for SAP applications 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-160000.1.1.x86_64 as component of SUSE Linux Enterprise Server 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-160000.1.1.x86_64 as component of SUSE Linux Enterprise Server for SAP applications 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.4-2.1.aarch64 as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.4-2.1.ppc64le as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.4-2.1.s390x as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.4-2.1.x86_64 as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-bash-completion-0:3.0.4-2.1.aarch64 as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-bash-completion-0:3.0.4-2.1.ppc64le as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-bash-completion-0:3.0.4-2.1.s390x as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-bash-completion-0:3.0.4-2.1.x86_64 as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-fish-completion-0:3.0.4-2.1.aarch64 as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-fish-completion-0:3.0.4-2.1.ppc64le as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-fish-completion-0:3.0.4-2.1.s390x as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-fish-completion-0:3.0.4-2.1.x86_64 as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-zsh-completion-0:3.0.4-2.1.aarch64 as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-zsh-completion-0:3.0.4-2.1.ppc64le as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-zsh-completion-0:3.0.4-2.1.s390x as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-zsh-completion-0:3.0.4-2.1.x86_64 as component of openSUSE Tumbleweedsuse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-160000.1.1.aarch64 as component of openSUSE Leap 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-160000.1.1.ppc64le as component of openSUSE Leap 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-160000.1.1.s390x as component of openSUSE Leap 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-0:3.0.5-160000.1.1.x86_64 as component of openSUSE Leap 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-bash-completion-0:3.0.5-160000.1.1.noarch as component of openSUSE Leap 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-fish-completion-0:3.0.5-160000.1.1.noarch as component of openSUSE Leap 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

  • Fixedcosign-zsh-completion-0:3.0.5-160000.1.1.noarch as component of openSUSE Leap 16.0suse_csaf

    To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".

02

cvss

Technical severity, 0–10. One row per scoring source.

5.5
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.15.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:Nprimary · NVD / NIST USexploitability 1.8 · impact 3.6
v3.15.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:Nsecondary · ENISA EU
v3.15.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:Nsecondary · security-advisories@github.comexploitability 1.8 · impact 3.6
v3.15.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:Nsecondary · OSV
v3.15.1mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)
v3.15.5mediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:Nsecondary · SUSE Product Security
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-345USCWE-345US
05

affected products (9)

Products and version ranges known to be affected.

06

advisories (7)

Vendor and ecosystem advisories describing this.

  • SUSE-SU-2026:0777-1Security update for cosign2026-03-03csaf · suse_csafDE

    Security update for cosign

  • SUSE-SU-2026:20904-1Security update for cosign2026-03-18csaf · suse_csafDE

    Security update for cosign

  • openSUSE-SU-2026:10232-1cosign-3.0.4-2.1 on GA media2026-02-20csaf · suse_csafDE

    cosign-3.0.4-2.1 on GA media

  • openSUSE-SU-2026:20386-1Security update for cosign2026-03-18csaf · suse_csafDE

    Security update for cosign

  • GHSA-whqx-f9j3-ch6mCosign verification accepts any valid Rekor entry under certain conditions2026-01-13ghsa · osvUS

    ### Impact A Cosign bundle can be crafted to successfully verify an artifact even if the embedded Rekor entry does not reference the artifact's digest, signature or public key. When verifying a Rekor entry, Cosign verifies the Rekor entry signature, and also compares the artifact's digest, the user's public key from either a Fulcio certificate or provided by the user, and the artifact signature to the Rekor entry contents. Without these comparisons, Cosign would accept any response from Rekor as valid. A malicious actor that has compromised a user's identity or signing key could construct a valid Cosign bundle by including any arbitrary Rekor entry, thus preventing the user from being able to audit the signing event. This vulnerability only affects users that provide a trusted root via `--trusted-root` or when fetched automatically from a TUF repository, when no trusted key material is provided via `SIGSTORE_REKOR_PUBLIC_KEY`. When using the default flag values in Cosign v3 to sign and verify (`--use-signing-config=true` and `--new-bundle-format=true` for signing, `--new-bundle-format=true` for verification), users are unaffected. Cosign v2 users are affected using the default flag values. This issue had previously been fixed in https://github.com/sigstore/cosign/security/advisories/GHSA-8gw7-4j42-w388 but recent refactoring caused a regression. We have added testing to prevent a future regression. #### Steps to Reproduce ``` echo blob > /tmp/blob cosign sign-blob -y --new-bundle-format=false --bundle /tmp/bundle.1 --use-signing-config=false /tmp/blob cosign sign-blob -y --new-bundle-format=false --bundle /tmp/bundle.2 --use-signing-config=false /tmp/blob jq ".rekorBundle |= $(jq .rekorBundle /tmp/bundle.2)" /tmp/bundle.1 > /tmp/bundle.3 cosign verify-blob --bundle /tmp/bundle.3 --certificate-identity-regexp='.*' --certificate-oidc-issuer-regexp='.*' /tmp/blob ``` ### Patches Upgrade to Cosign v2.6.2 or Cosign v3.0.4. This does not affect Cosign v1. ### Workarounds You can provide trusted key material via a set of flags under certain conditions. The simplest fix is to upgrade to the latest Cosign v2 or v3 release. Note that the example below works for `cosign verify`, `cosign verify-blob, `cosign verify-blob-attestation`, and `cosign verify-attestation`. ``` SIGSTORE_REKOR_PUBLIC_KEY=<path to Rekor pub key> cosign verify-blob --use-signing-config=false --new-bundle-format=false --bundle=<path to bundle> <artifact> ```

  • BIT-cosign-2026-22703Cosign verification accepts any valid Rekor entry under certain conditions2026-08-24vendor · osvUS

    Cosign provides code signing and transparency for containers and binaries. Prior to versions 2.6.2 and 3.0.4, Cosign bundle can be crafted to successfully verify an artifact even if the embedded Rekor entry does not reference the artifact's digest, signature or public key. When verifying a Rekor entry, Cosign verifies the Rekor entry signature, and also compares the artifact's digest, the user's public key from either a Fulcio certificate or provided by the user, and the artifact signature to the Rekor entry contents. Without these comparisons, Cosign would accept any response from Rekor as valid. A malicious actor that has compromised a user's identity or signing key could construct a valid Cosign bundle by including any arbitrary Rekor entry, thus preventing the user from being able to audit the signing event. This issue has been patched in versions 2.6.2 and 3.0.4.

  • GO-2026-4309Cosign verification accepts any valid Rekor entry under certain conditions in github.com/sigstore/cosign2026-01-13vendor · osvUS

    Cosign verification accepts any valid Rekor entry under certain conditions in github.com/sigstore/cosign

07

also known as (6)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdosvnvdsuse_csafNVDCVE.orgMITRE
published 2026-01-10modified 2026-06-17
09

references (10)

External citations — patches, advisories, analysis.

scry

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