CVE-2026-4177

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Source
https://cve.org/CVERecord?id=CVE-2026-4177
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-4177.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-4177
Downstream
Related
Published
2026-03-16T22:30:25.367Z
Modified
2026-07-16T03:48:31.376665939Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H CVSS Calculator
Summary
YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-severity heap buffer overflow in the YAML emitter
Details

YAML::Syck versions through 1.36 for Perl has several potential security vulnerabilities including a high-severity heap buffer overflow in the YAML emitter.

The heap overflow occurs when class names exceed the initial 512-byte allocation.

The base64 decoder could read past the buffer end on trailing newlines.

strtok mutated n->type_id in place, corrupting shared node data.

A memory leak occurred in syckhdlradd_anchor when a node already had an anchor. The incoming anchor string 'a' was leaked on early return.

Database specific 
{
    "cwe_ids": [
        "CWE-122"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/4xxx/CVE-2026-4177.json",
    "cna_assigner": "CPANSec"
}
References

Affected packages

Git / github.com/cpan-authors/yaml-syck

Affected ranges

Type
GIT
Repo
https://github.com/cpan-authors/yaml-syck
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
7392511136cd9c41a3e0a7048b30a1cfcb83de39
Fixed
e8844a31c8cf0052914b198fc784ed4e6b8ae69e
Database specific 
{
    "cpe": "cpe:2.3:a:toddr:yaml\\:\\:syck:*:*:*:*:*:perl:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "1.37"
        }
    ],
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

0.*
0.01
0.02
0.03
0.04
0.05
0.06
0.07
0.08
0.09
0.10
0.11
0.12
0.13
0.14
0.15
0.16
0.17
0.18
0.19
0.20
0.21
0.22
0.23
0.24
0.25
0.26
0.27
0.28
0.29
0.30
0.31
0.32
0.33
0.34
0.35
0.36
0.37
0.38
0.40
0.41
0.42
0.43
0.44
0.45
0.46_01
0.60
0.61
0.62
0.63
0.64
0.65
0.66
0.67
0.70
0.71
0.72
0.80
0.81
0.82
0.84
0.85
0.86
0.87
0.88
0.90
0.91
0.94
0.95
0.96
0.97
0.98
0.99
1.*
1.00
1.01
1.02
1.03
1.04
1.05
1.07
1.07_01
1.08
1.08_01
1.09
1.10
1.10_01
1.10_02
1.10_03
1.10_04
1.10_05
1.10_06
1.10_07
1.11
1.12
1.13
1.14
1.15
1.20
1.21_01
1.22
1.23
1.24_01
1.24_02
1.26
1.27
1.28
1.28_01
1.29_01
1.30
1.30_01
1.31
1.32
1.33
1.34
1.35
1.36
1.37_01

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-4177.json"