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Fencer Vulns
high 8.4

CVE-2021-41641 json

Link Following in Deno

published 2022-06-12 4 y ago modified 2026-07-18 3 mo ago also EUVD-2022-5954 , GHSA-67hm-27mx-9cg7 , JLSEC-2026-99

cvss
8.4
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits
0
none known

Summary

Deno <=1.14.0 file sandbox does not handle symbolic links correctly. When running Deno with specific write access, the Deno.symlink method can be used to gain access to any directory.

Patch / fix

  • crates.io deno 1.16.0
  • julia Deno_jll 1.14.3+0

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • hackers.report https://hackers.report/report/614876917a7b150012836bb8 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/denoland/deno/issues/12152 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
GitHub 3.1 8.4 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
NVD 3.1 8.4 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
NVD 2.0 3.6 AV:L/AC:L/Au:N/C:P/I:P/A:N
OSV 3.1 8.4 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
crates.io deno
<1.16.0
1.16.0
julia Deno_jll
>=1.10.3+0, <1.14.3+0
1.14.3+0

Classification

Weakness
  • CWE-59 Improper Link Resolution Before File Access

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.