# CVE-2026-86219: Authen::SASL::Perl::DIGEST_MD5 versions before 2.2100 for Perl accept replayed authentication responses via unverified nonce in server_step. > Attackers can replay captured authentication responses to bypass password verification and impersonate users in Perl SASL DIGEST-MD5 implementations. - **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`) - **Exploited in the wild:** Not known - **Login needed:** Not needed - **Attackable:** Over the internet - **Victim action needed:** Not needed - **Fix available:** Yes - **Published:** 6 Sep 2026 - **Updated:** 8 Sep 2026 - **Also known as:** BELL-CVE-2026-86219, DEBIAN-CVE-2026-86219, GHSA-w4h4-7ff5-56xr, MGASA-2026-0400, OESA-2026-3775, OESA-2026-3776, OESA-2026-3778, OESA-2026-4004, ROOT-OS-DEBIAN-12-CVE-2026-86219, SUSE-SU-2026:23913-1, SUSE-SU-2026:4280-1, SUSE-SU-2026:4302-1, UBUNTU-CVE-2026-86219, USN-8858-1, openSUSE-SU-2026:11734-1, openSUSE-SU-2026:21946-1 ## What is CVE-2026-86219? CVE-2026-86219 is a critical authentication bypass vulnerability in perl-Authen-SASL, published on 6 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. ### Official description Authen::SASL::Perl::DIGEST_MD5 versions before 2.2100 for Perl accept replayed authentication responses via unverified nonce in server_step. server_start generates a fresh nonce and sends it in the challenge, and nothing later compares that value against the nonce the client returns. server_step derives the expected digest from the client's own parameters, so a response verifies whenever its digest matches the nonce it carries. The count table it also checks is keyed on the client-supplied nonce and starts empty in each new server object, so a captured first response, carrying `nc=00000001`, passes that too. RFC 2831 defines the nonce in the response as the value the server sent in the preceding challenge. An attacker who observes one successful `qop=auth` exchange can replay the captured response against a later session for the same service, host, realm and user, and authenticate as that user without knowing the password. Weakness: CWE-294 (Authentication Bypass by Capture-replay) ## Which versions are affected by CVE-2026-86219? | Package | Ecosystem | Affected | Fixed in | | --- | --- | --- | --- | | `perl-Authen-SASL` | SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | All versions | 2.16-150000.1.9.1 | | `perl-Authen-SASL` | SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS | All versions | 2.16-150000.1.9.1 | | `perl-Authen-SASL` | SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | All versions | 2.16-150000.1.9.1 | | `perl-Authen-SASL` | SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS | All versions | 2.16-150000.1.9.1 | | `perl-Authen-SASL` | SUSE:Linux Enterprise Module for Development Tools 15 SP7 | All versions | 2.16-150000.1.9.1 | | `perl-Authen-SASL` | SUSE:Linux Enterprise Server 12 SP5-LTSS | All versions | 2.16-5.6.1 | | `perl-Authen-SASL` | SUSE:Linux Enterprise Server 15 SP4-LTSS | All versions | 2.16-150000.1.9.1 | | `perl-Authen-SASL` | SUSE:Linux Enterprise Server 15 SP5-LTSS | All versions | 2.16-150000.1.9.1 | | `perl-Authen-SASL` | SUSE:Linux Enterprise Server 15 SP6-LTSS | All versions | 2.16-150000.1.9.1 | | `perl-Authen-SASL` | SUSE:Linux Enterprise Server 16.0 | All versions | 2.170.0-160000.4.1 | | `perl-Authen-SASL` | SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5 | All versions | 2.16-5.6.1 | | `perl-Authen-SASL` | SUSE:Linux Enterprise Server for SAP Applications 15 SP4 | All versions | 2.16-150000.1.9.1 | | `perl-Authen-SASL` | SUSE:Linux Enterprise Server for SAP Applications 15 SP5 | All versions | 2.16-150000.1.9.1 | | `perl-Authen-SASL` | SUSE:Linux Enterprise Server for SAP Applications 15 SP6 | All versions | 2.16-150000.1.9.1 | | `perl-Authen-SASL` | SUSE:Linux Enterprise Server for SAP applications 16.0 | All versions | 2.170.0-160000.4.1 | | `perl-Authen-SASL` | openSUSE:Leap 16.0 | All versions | 2.170.0-160000.4.1 | | `perl-Authen-SASL` | openSUSE:Tumbleweed | All versions | 2.210.0-1.1 | ## How do I fix CVE-2026-86219? Upgrade to a fixed version. ## Is CVE-2026-86219 being exploited? There is no known exploitation of CVE-2026-86219 in the wild and no public exploit code. ## Fix prompt for AI coding agents ```text Check this codebase for CVE-2026-86219 and fix it if it is affected. What it is: CVE-2026-86219 is a critical authentication bypass vulnerability in perl-Authen-SASL, published on 6 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim. Exploitation: There is no known exploitation of CVE-2026-86219 in the wild and no public exploit code. Affected product: perl-Authen-SASL. 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-2026-86219/ (Markdown: https://insights.sbomify.com/CVE-2026-86219/index.md) ``` ## Sources - CVE record: https://www.cve.org/CVERecord?id=CVE-2026-86219 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-86219 - OSV: https://osv.dev/vulnerability/CVE-2026-86219 --- From sbomify Insights: https://insights.sbomify.com/CVE-2026-86219/ Summaries are generated and may contain mistakes; the official description above is the record.