01 Record

CVE-2026-81928

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

HighPUBLISHEDCNA: CPANSec

CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

View raw JSON

02 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

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.68% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 52.2% of scored records. A rank, not a probability.

NVD base score

7.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD analysis status

Deferred. NVD last modified this record on 2026-09-03.

Red Hat severity

Important. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2026-09-01 23:14Z1 MO AGO

Last updated

2026-09-02 19:24Z1 MO AGO

Reserved

2026-08-27

Assigning CNA

CPANSec

Record state

PUBLISHED

Severity

High (CVSS 7.5)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses

CWE-674Uncontrolled RecursionClass
CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')Base

Data version

5.2

Document digest

0e0a2b3bd3b9110c1d26871e08e161415a87fdc4ee7c161813029e1de646434c

05 Affected products

VendorProductVersionsPlatforms

redhatenterprise_linuxNot specified—

06 References

metacpan.orghttps://metacpan.org/release/NLNETLABS/Net-DNS-1.56/source/lib/Net/DNS/RR/TSIG.pm#L245-262
metacpan.orghttps://metacpan.org/release/NLNETLABS/Net-DNS-1.56/source/lib/Net/DNS/RR/TSIG.pm#L62-73
datatracker.ietf.orghttps://datatracker.ietf.org/doc/html/rfc8945#section-5.2
rt.cpan.orghttps://rt.cpan.org/Ticket/Display.html?id=181125issue-tracking
metacpan.orghttps://metacpan.org/release/NLNETLABS/Net-DNS-1.57/changesrelease-notes
www.openwall.comhttp://www.openwall.com/lists/oss-security/2026/09/02/1

07 Remediation

Upgrade to Net-DNS 1.57 or later.

08 Fixed in

AlmaLinux 8

perl-Net-DNS
Fixed in 1.15-2.el8_10

AlmaLinux 9

perl-Net-DNS
Fixed in 1.29-6.el9_8.1
perl-Net-DNS-Nameserver
Fixed in 1.29-6.el9_8.1

CloudLinux 8

perl-Net-DNS
Fixed in 1.15-2.el8_10

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

CloudLinux 9

perl-Net-DNS
Fixed in 1.29-6.el9_8.1
perl-Net-DNS-Nameserver
Fixed in 1.29-6.el9_8.1

Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.

Debian 12

libnet-dns-perl
No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

libnet-dns-perl
No fix yet

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

libnet-dns-perl
Fixed in 1.57-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.