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CVE-2026-87078— Net::IDN::Punycode versions from 2.302 before 2.590 for Perl leak the output buffer on every rejected label in decode_punycode

Quick assessment

Affected
CVE-2026-87078
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Net::IDN::Punycode versions from 2.302 before 2.590 for Perl leak the output buffer on every rejected label in decode_punycode. The XS backend allocates the scalar it returns before it validates the input, sizing the buffer at twice the input length. The scala

EPSS 0.15% · P5

Affected Version Matrix 1

VendorProduct Version RangeStatus
None None 2.302< 2.590 affected

I. Basic Information for CVE-2026-87078

Vulnerability Information

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Vulnerability Title
Net::IDN::Punycode versions from 2.302 before 2.590 for Perl leak the output buffer on every rejected label in decode_punycode
Source: CVE Program / CVE List V5
Vulnerability Description
Net::IDN::Punycode versions from 2.302 before 2.590 for Perl leak the output buffer on every rejected label in decode_punycode. The XS backend allocates the scalar it returns before it validates the input, sizing the buffer at twice the input length. The scalar is released only on the success path, so each of the three croaks that reject a label leaves the scalar and its buffer allocated. Nothing bounds the label length in the to-Unicode direction, since the 63-byte DNS limit is checked only when converting to ASCII. Only the XS backend is affected. A sender who supplies invalid labels grows the process by twice the label length per rejected call, with no successful call needed.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 2.302 ~ 2.590 -

II. Public POCs for CVE-2026-87078

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III. Intelligence Information for CVE-2026-87078

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Patches & Fixes for CVE-2026-87078 (2)

Other References for CVE-2026-87078 (1)

IV. Related Vulnerabilities

Same weakness: CWE-401

V. Comments for CVE-2026-87078

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