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Fencer Intel
high 7.5

CVE-2026-93710 json

Dancer2 versions from 2.0.0 before 2.2.0 for Perl dispatch a route that a dying hook refused when the exception handler halts the response in compile_hooks

published last mo. modified last mo. also EUVD-2026-84256 , GHSA-v527-r4px-7vx7

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository PerlDancer/Dancer2. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits
0
none known

Summary

Dancer2 versions from 2.0.0 before 2.2.0 for Perl dispatch a route that a dying hook refused when the exception handler halts the response in compile_hooks.

A hook that dies fires core.app.hook_exception, then calls cleanup unless the failing hook is the exception handler. A handler that halts does not stop that cleanup, which discards the request, response and session the dispatcher has yet to read, so the refused route runs.

The handler has to halt the response object by calling its halt method or setting is_halted: the halt keyword unwinds through with_return before cleanup runs.

A check in a before hook is not enforced: the caller gets the refusal, while the route body runs and its writes land.

Patch / fix

  • libdancer2-perl Debian 14 2.2.2-1

debian advisories DEBIAN-CVE-2026-93710

  • perl-Dancer2 openSUSE Tumbleweed 2.2.2-1.1

opensuse advisories openSUSE-SU-2026:12202-1

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CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
last mo.

Exploit prediction

0.63% chance of exploitation in the next 30 days, higher than 50% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

Weakness
  • CWE-460 Improper Cleanup on Thrown Exception

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of PerlDancer/Dancer2 published their own advisory on GitHub. Reviewed sources take precedence over it.