CVE-2026-73646

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Source
https://cve.org/CVERecord?id=CVE-2026-73646
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73646.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-73646
Aliases
Downstream
CGA (180)
CLEANSTART (2)
CLSA (25)
DEBIAN (1)
ECHO (1)
MINI (6)
openSUSE (1)
RHSA (2)
ROOT (1)
UBUNTU (1)
Related
Published
2026-08-17T15:35:13Z
Modified
2026-10-28T02:30:42Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
PostCSS: Path Traversal in Previous Source Map Auto-Loading (sourceMappingURL) leads to Arbitrary .map File Disclosure
Details

PostCSS takes a CSS file and provides an API to analyze and modify its rules by transforming the rules into an Abstract Syntax Tree. Prior to 8.5.18, lib/previous-map.js loadMap() passes attacker-controlled sourceMappingURL values to join(dirname(opts.from), annotation), and loadFile() permits traversed or absolute .map paths, allowing untrusted CSS processed without map: false to disclose sourcesContent from arbitrary reachable .map files through result.map. This issue is fixed in version 8.5.18.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-22"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73646.json"
}
References

Affected packages

Git / github.com/postcss/postcss

Affected ranges

Type
GIT
Repo
https://github.com/postcss/postcss
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
4c0d194c136fd374495d0993c890d794cab65b81
Fixed
95663d3eb7ba26f4854dd19d3b4f4425760cf56c
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "8.5.18"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "95663d3eb7ba26f4854dd19d3b4f4425760cf56c"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "8.5.18",
            "range":  [
                {
                    "fixed":  "4c0d194c136fd374495d0993c890d794cab65b81"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

0.*
0.1
0.2
0.3
0.3.1
0.3.2
0.3.3
0.3.4
0.3.5
1.*
1.0.0
2.*
2.0.0
2.1.0
2.1.1
2.1.2
2.2.0
2.2.1
2.2.2
2.2.3
2.2.4
2.2.5
2.2.6
3.*
3.0.0
3.0.1
3.0.2
3.0.3
3.0.4
3.0.5
3.0.6
3.0.7
4.*
4.0.0
4.0.1
4.0.2
4.0.3
4.0.4
4.0.5
4.0.6
4.1.0
4.1.1
4.1.10
4.1.11
4.1.12
4.1.13
4.1.14
4.1.15
4.1.16
4.1.2
4.1.3
4.1.4
4.1.5
4.1.6
4.1.7
4.1.8
4.1.9
5.*
5.0.0
5.0.1
5.0.10
5.0.11
5.0.12
5.0.13
5.0.14
5.0.15
5.0.16
5.0.17
5.0.18
5.0.19
5.0.2
5.0.20
5.0.21
5.0.3
5.0.4
5.0.5
5.0.6
5.0.7
5.0.8
5.0.9
5.1.0
5.1.1
5.1.2
5.2.0
5.2.1
5.2.10
5.2.11
5.2.12
5.2.13
5.2.14
5.2.15
5.2.16
5.2.17
5.2.2
5.2.3
5.2.4
5.2.5
5.2.6
5.2.7
5.2.8
5.2.9
6.*
6.0.0
6.0.1
6.0.10
6.0.11
6.0.12
6.0.13
6.0.14
6.0.15
6.0.16
6.0.17
6.0.18
6.0.19
6.0.2
6.0.20
6.0.21
6.0.22
6.0.23
6.0.3
6.0.4
6.0.5
6.0.6
6.0.7
6.0.8
6.0.9
7.*
7.0.0
7.0.1
7.0.10
7.0.11
7.0.12
7.0.13
7.0.14
7.0.15
7.0.16
7.0.17
7.0.18
7.0.19
7.0.2
7.0.20
7.0.21
7.0.22
7.0.23
7.0.24
7.0.25
7.0.26
7.0.27
7.0.28
7.0.29
7.0.3
7.0.30
7.0.31
7.0.32
7.0.4
7.0.5
7.0.6
7.0.7
7.0.8
7.0.9
8.*
8.0.0
8.0.1
8.0.2
8.0.3
8.0.4
8.0.5
8.0.6
8.0.7
8.0.8
8.0.9
8.1.0
8.1.1
8.1.10
8.1.11
8.1.12
8.1.13
8.1.14
8.1.2
8.1.3
8.1.4
8.1.5
8.1.6
8.1.7
8.1.8
8.1.9
8.2.0
8.2.1
8.2.10
8.2.11
8.2.12
8.2.13
8.2.14
8.2.15
8.2.2
8.2.3
8.2.4
8.2.5
8.2.6
8.2.7
8.2.8
8.2.9
8.3.0
8.3.1
8.3.10
8.3.11
8.3.2
8.3.3
8.3.4
8.3.5
8.3.6
8.3.7
8.3.8
8.3.9
8.4.0
8.4.1
8.4.10
8.4.11
8.4.12
8.4.13
8.4.14
8.4.15
8.4.16
8.4.17
8.4.18
8.4.19
8.4.2
8.4.20
8.4.21
8.4.22
8.4.23
8.4.24
8.4.25
8.4.26
8.4.27
8.4.28
8.4.29
8.4.3
8.4.30
8.4.31
8.4.32
8.4.33
8.4.34
8.4.35
8.4.36
8.4.37
8.4.38
8.4.39
8.4.4
8.4.40
8.4.41
8.4.42
8.4.43
8.4.44
8.4.45
8.4.46
8.4.47
8.4.48
8.4.49
8.4.5
8.4.6
8.4.7
8.4.8
8.4.9
8.5.0
8.5.1
8.5.10
8.5.11
8.5.12
8.5.13
8.5.14
8.5.15
8.5.16
8.5.17
8.5.2
8.5.3
8.5.4
8.5.5
8.5.6
8.5.7
8.5.8
8.5.9

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73646.json"