{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-81928 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-81928 is a high-severity denial of service vulnerability in perl-Net-DNS, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-81928 and fix it if it is affected.\n\nWhat it is: CVE-2026-81928 is a high-severity denial of service vulnerability in perl-Net-DNS, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-81928 in the wild and no public exploit code.\n\nAffected product: perl-Net-DNS. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. 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.\n2. 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.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-81928/ (Markdown: https://insights.sbomify.com/CVE-2026-81928/index.md)","id":"CVE-2026-81928","markdown":"https://insights.sbomify.com/CVE-2026-81928/index.md","name":"CVE-2026-81928","record":{"aliases":["ALSA-2026:68786","ALSA-2026:68787","DEBIAN-CVE-2026-81928","GHSA-x88w-xx7m-3m5f","RHSA-2026:68786","RHSA-2026:68787","RLSA-2026:68786","RLSA-2026:68787","SUSE-SU-2026:4065-1","SUSE-SU-2026:4086-1","UBUNTU-CVE-2026-81928","openSUSE-SU-2026:11708-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Perl DNS library","requires_auth":"none","summary":"Attackers can cause memory exhaustion and process termination in Perl Net::DNS applications by sending crafted DNS messages with misplaced TSIG records.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"CPANSec","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cisa-adp","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-674","name":"Uncontrolled Recursion"}],"description":"Net::DNS versions before 1.57 for Perl allow memory exhaustion via unbounded recursion in sig_data when re-encoding a message with a misplaced TSIG record.\n\nsig_data signs a message by re-encoding it, and removes TSIG records only from the additional section. A TSIG decoded into the answer or authority section survives that step and is signed again, so encoding re-enters sig_data with no termination condition. Decoding does not reject such a message: a TSIG that is not the last record on the wire raises \"misplaced or corrupt TSIG\", but the error is caught, reported as a warning, and the record is left in the packet. RFC 8945 section 5.2 requires the message to be dropped.\n\nThe recursion is reached only when the decoded TSIG carries an empty MAC, since a MAC recovered from the wire short-circuits the signing step. It is reached only from code that re-encodes a message it decoded, such as a forwarder or a proxy. A decoded message that is never re-encoded is unaffected. Message direction does not matter: a query reaches the same path as a response.\n\nEach cycle re-encodes the whole message, so fewer than 100 bytes on the wire exhaust available memory and terminate the process.","ecosystems":["AlmaLinux:8","AlmaLinux:9","Red Hat:enterprise_linux:8::appstream","Red Hat:enterprise_linux:9::appstream","Red Hat:enterprise_linux:9::crb","Rocky Linux:8","Rocky Linux:9","SUSE:Linux Enterprise Module for Basesystem 15 SP7","SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5","openSUSE:Tumbleweed"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Net::DNS versions before 1.57 for Perl allow memory exhaustion via unbounded recursion in sig_data when re-encoding a message with a misplaced TSIG record.","id":"CVE-2026-81928","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":11,"n_references":5,"next":{"headline":"Cross-site scripting in Ocean Pro Demos","id":"CVE-2026-81929"},"packages":[{"ecosystem":"AlmaLinux:8","fixed":["1.15-2.el8_10"],"introduced":["0"],"last_affected":[],"package":"perl-Net-DNS","purl":"pkg:rpm/almalinux/perl-Net-DNS","source":"ALSA-2026:68787"},{"ecosystem":"AlmaLinux:9","fixed":["1.29-6.el9_8.1"],"introduced":["0"],"last_affected":[],"package":"perl-Net-DNS","purl":"pkg:rpm/almalinux/perl-Net-DNS","source":"ALSA-2026:68786"},{"ecosystem":"AlmaLinux:9","fixed":["1.29-6.el9_8.1"],"introduced":["0"],"last_affected":[],"package":"perl-Net-DNS-Nameserver","purl":"pkg:rpm/almalinux/perl-Net-DNS-Nameserver","source":"ALSA-2026:68786"},{"ecosystem":"Red Hat:enterprise_linux:8::appstream","fixed":["0:1.15-2.el8_10"],"introduced":["0"],"last_affected":[],"package":"perl-Net-DNS","purl":"pkg:rpm/redhat/perl-Net-DNS","source":"RHSA-2026:68787"},{"ecosystem":"Red Hat:enterprise_linux:9::appstream","fixed":["0:1.29-6.el9_8.1"],"introduced":["0"],"last_affected":[],"package":"perl-Net-DNS","purl":"pkg:rpm/redhat/perl-Net-DNS","source":"RHSA-2026:68786"},{"ecosystem":"Red Hat:enterprise_linux:9::crb","fixed":["0:1.29-6.el9_8.1"],"introduced":["0"],"last_affected":[],"package":"perl-Net-DNS-Nameserver","purl":"pkg:rpm/redhat/perl-Net-DNS-Nameserver","source":"RHSA-2026:68786"},{"ecosystem":"Rocky Linux:8","fixed":["0:1.15-2.el8_10"],"introduced":["0"],"last_affected":[],"package":"perl-Net-DNS","purl":"pkg:rpm/rocky-linux/perl-Net-DNS?distro=rocky-linux-8-x86-64\u0026epoch=0","source":"RLSA-2026:68787"},{"ecosystem":"Rocky Linux:9","fixed":["0:1.29-6.el9_8.1"],"introduced":["0"],"last_affected":[],"package":"perl-Net-DNS","purl":"pkg:rpm/rocky-linux/perl-Net-DNS?distro=rocky-linux-9-x86-64\u0026epoch=0","source":"RLSA-2026:68786"},{"ecosystem":"SUSE:Linux Enterprise Module for Basesystem 15 SP7","fixed":["1.14-150000.3.6.1"],"introduced":["0"],"last_affected":[],"package":"perl-Net-DNS","purl":"pkg:rpm/suse/perl-Net-DNS\u0026distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP7","source":"SUSE-SU-2026:4086-1"},{"ecosystem":"SUSE:Linux Enterprise Server LTSS Extended Security 12 SP5","fixed":["0.73-5.6.1"],"introduced":["0"],"last_affected":[],"package":"perl-Net-DNS","purl":"pkg:rpm/suse/perl-Net-DNS\u0026distro=SUSE%20Linux%20Enterprise%20Server%20LTSS%20Extended%20Security%2012%20SP5","source":"SUSE-SU-2026:4065-1"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["1.570.0-1.1"],"introduced":["0"],"last_affected":[],"package":"perl-Net-DNS","purl":"pkg:rpm/opensuse/perl-Net-DNS\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2026:11708-1"}],"prev":{"headline":"Concrete CMS before 9.5.3 is vulnerable to Stored XSS via SVG upload in \"Reject\" sanitization mode","id":"CVE-2026-81927"},"products":[],"published":"2026-09-01","related":[],"sources":[{"class":"attribution","licence":"MIT","name":"AlmaLinux","prefix":"ALSA"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"Red Hat","prefix":"RHSA"},{"class":"attribution","licence":"BSD","name":"Rocky Linux","prefix":"RLSA"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"SUSE"},{"class":"attribution","licence":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-02","vendors":[]},"summary":"Attackers can cause memory exhaustion and process termination in Perl Net::DNS applications by sending crafted DNS messages with misplaced TSIG records.","url":"https://insights.sbomify.com/CVE-2026-81928/"}