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Fencer Vulns
high 7.5

CVE-2023-34620 json

hjson stack exhaustion vulnerability

published 2023-06-14 3 y ago modified 2026-09-10 1 mo ago also GHSA-5wfc-hjrc-gq87 , GO-2026-5157 , EUVD-2023-1706

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

An issue was discovered hjson thru 3.0.0 allows attackers to cause a denial of service or other unspecified impacts via crafted object that uses cyclic dependencies.

Patch / fix

  • maven org.hjson:hjson 3.0.1
  • packagist laktak/hjson 2.3.0
  • go github.com/hjson/hjson-go/v4 4.5.0
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
22 mo ago

Exploit prediction

0.78% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/hjson/hjson-java/issues/24 referenced PoC, tagged "exploit" by a source, unverified

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
NVD 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
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
maven org.hjson:hjson
<3.0.1
3.0.1
packagist laktak/hjson
<2.3.0
2.3.0
go github.com/hjson/hjson-go/v4
<4.5.0
4.5.0
go github.com/hjson/hjson-go
all versions
 no fix listed

Classification

Weakness

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.