# CVE-2026-42784: Sequoia-openpgp: sequoia-openpgp: cryptographic integrity compromise via key flag confusion > Attackers can bypass back-signature checks to forge signatures and bind arbitrary subkeys, compromising cryptographic integrity in applications using this library. - **Severity:** High 7.4 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** A user has to click or open something - **Fix available:** Yes - **Published:** 16 Sep 2026 - **Updated:** 15 Oct 2026 - **Also known as:** ALSA-2026:76733, ALSA-2026:76734, ALSA-2026:76735, ALSA-2026:76737, AZL-105170, DEBIAN-CVE-2026-42784, GHSA-g33h-rrj9-75qv, RHSA-2026:42902, RHSA-2026:76733, RHSA-2026:76734, RHSA-2026:76735, RHSA-2026:76737, RLSA-2026:76733, RLSA-2026:76734, RLSA-2026:76735, RLSA-2026:76737, UBUNTU-CVE-2026-42784 ## What is CVE-2026-42784? CVE-2026-42784 is a high-severity vulnerability in Red Hat Confidential Compute Attestation, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. ### Official description A flaw was found in sequoia-openpgp. The library incorrectly infers key flags for older certificates when a key flags subpacket is missing, leading to a discrepancy in how key capabilities are viewed. This key flag confusion allows an attacker to bypass the back-signature check. Consequently, an attacker can illegitimately bind an arbitrary subkey to their own certificate and forge signatures, completely compromising cryptographic integrity. Weakness: CWE-347 (Improper Verification of Cryptographic Signature) ## Which versions are affected by CVE-2026-42784? | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `rpm-sequoia` | AlmaLinux:10 | All versions | 1.10.2.1-1.el10_2 | | `rpm-sequoia-devel` | AlmaLinux:10 | All versions | 1.10.2.1-1.el10_2 | | `sequoia-sq` | AlmaLinux:10 | All versions | 1.4.0.1-2.el10_2 | | `sequoia-sqv` | AlmaLinux:10 | All versions | 1.3.0.2-1.el10_2 | | `rpm-sequoia` | AlmaLinux:9 | All versions | 1.10.2.1-1.el9_8 | | `rpm-sequoia-devel` | AlmaLinux:9 | All versions | 1.10.2.1-1.el9_8 | | `rpm-sequoia` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.10.2.1-1.el10_2 | | `rpm-sequoia-debuginfo` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.10.2.1-1.el10_2 | | `rpm-sequoia-devel` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.10.2.1-1.el10_2 | | `rust-rpm-sequoia` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.10.2.1-1.el10_2 | | `rust-rpm-sequoia-debugsource` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.10.2.1-1.el10_2 | | `rust-sequoia-sq` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.4.0.1-2.el10_2 | | `rust-sequoia-sq-debugsource` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.4.0.1-2.el10_2 | | `rust-sequoia-sqv` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.3.0.2-1.el10_2 | | `rust-sequoia-sqv-debugsource` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.3.0.2-1.el10_2 | | `sequoia-sq` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.4.0.1-2.el10_2 | | `sequoia-sq-debuginfo` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.4.0.1-2.el10_2 | | `sequoia-sqv` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.3.0.2-1.el10_2 | | `sequoia-sqv-debuginfo` | Red Hat:enterprise_linux:10.2 | All versions | 0:1.3.0.2-1.el10_2 | | `rpm-sequoia` | Red Hat:enterprise_linux:9::baseos | All versions | 0:1.10.2.1-1.el9_8 | | `rpm-sequoia-debuginfo` | Red Hat:enterprise_linux:9::baseos | All versions | 0:1.10.2.1-1.el9_8 | | `rust-rpm-sequoia` | Red Hat:enterprise_linux:9::baseos | All versions | 0:1.10.2.1-1.el9_8 | | `rust-rpm-sequoia-debugsource` | Red Hat:enterprise_linux:9::baseos | All versions | 0:1.10.2.1-1.el9_8 | | `rpm-sequoia-debuginfo` | Red Hat:enterprise_linux:9::crb | All versions | 0:1.10.2.1-1.el9_8 | | `rpm-sequoia-devel` | Red Hat:enterprise_linux:9::crb | All versions | 0:1.10.2.1-1.el9_8 | | `rust-rpm-sequoia-debugsource` | Red Hat:enterprise_linux:9::crb | All versions | 0:1.10.2.1-1.el9_8 | | `podman-sequoia` | Red Hat:hummingbird:1 | All versions | 0:0.3.2-4.hum1 | | `rust-podman-sequoia` | Red Hat:hummingbird:1 | All versions | 0:0.3.2-4.hum1 | | `rust-rpm-sequoia` | Rocky Linux:10 | All versions | 0:1.10.2.1-1.el10_2 | | `rust-sequoia-sq` | Rocky Linux:10 | All versions | 0:1.4.0.1-2.el10_2 | | `rust-sequoia-sqv` | Rocky Linux:10 | All versions | 0:1.3.0.2-1.el10_2 | | `rust-rpm-sequoia` | Rocky Linux:9 | All versions | 0:1.10.2.1-1.el9_8 | ## How do I fix CVE-2026-42784? Apply the vendor's patch. ## Is CVE-2026-42784 being exploited? There is no known exploitation of CVE-2026-42784 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-42784 and fix it if it is affected. What it is: CVE-2026-42784 is a high-severity vulnerability in Red Hat Confidential Compute Attestation, published on 16 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link. Exploitation: There is no known exploitation of CVE-2026-42784 in the wild and no public exploit code. Affected product: Red Hat Confidential Compute Attestation. No package-level version data is available, so check the vendor advisory linked from the reference page. Task: 1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies. 2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it. 3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead. 4. Run the tests and summarise what changed and why. 5. If nothing in the project is affected, say so and change nothing. Reference: https://insights.sbomify.com/CVE-2026-42784/ (Markdown: https://insights.sbomify.com/CVE-2026-42784/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-42784 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-42784 - OSV: https://osv.dev/vulnerability/CVE-2026-42784 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-42784/ Summaries are generated and may contain mistakes; the official description above is the record.