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CVE-2026-81928 is an uncontrolled-recursion denial-of-service vulnerability in Perl Net::DNS versions before 1.57. The sig_data routine signs a DNS message by re-encoding it and, in affected versions, removes TSIG records only from the additional section. A TSIG record decoded into the answer or authority section remains present and is processed again during re-encoding, recursively re-entering sig_data without a termination condition. Although the decoder identifies an improperly positioned TSIG as misplaced or corrupt, it handles that condition as a warning and retains the record rather than dropping the message as required by RFC 8945 section 5.2.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
22 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A network-accessible, low-complexity vulnerability with no required privileges or user interaction that affects availability; the referenced Rocky Linux 9 packages are perl-Net-DNS-Nameserver and perl-net-dns.
A remotely exploitable, low-complexity unauthenticated vulnerability affecting perl-Net-DNS on SUSE Linux 12, with impact limited to availability according to the provided CVSS vectors.
A network-accessible, low-complexity vulnerability affecting Perl Net::DNS on SUSE Linux 15 that can cause high availability impact.
A network-accessible, low-complexity, unauthenticated vulnerability affecting perl-net-dns on Miracle Linux 8 with high availability impact and no stated confidentiality or integrity impact.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.