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Fencer Vulns
high 7.5

CVE-2021-39176 json

Missing Release of Memory after Effective Lifetime in detect-character-encoding

published 2021-08-31 5 y ago modified 2026-07-08 4 mo ago also GHSA-5rwj-j5m3-3chj , EUVD-2021-1986

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.9%
EPSS 1.9% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

detect-character-encoding is a package for detecting character encoding using ICU. In detect-character-encoding v0.3.0 and earlier, allocated memory is not released. The problem has been patched in detect-character-encoding v0.3.1.

Patch / fix

  • npm detect-character-encoding 0.3.1
  • detect-character-encoding_project detect-character-encoding 0.3.1

Exploit prediction

1.89% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/sonicdoe/detect-character-encoding/security/advisories/GHSA-5rwj-j5m3-3chj referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
npm detect-character-encoding
<0.3.1
0.3.1

Affected products

  • sonicdoe detect-character-encoding

Classification

Weakness
  • CWE-401 Missing Release of Memory after Effective Lifetime

References

Sources

Fencer Vulns 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.