CVE-2026-55599

phpseclib is a PHP secure communications library. From 0.1.1 until 1.0.30, 2.0.55, and 3.0.54, when an application validates an untrusted X.509 certificate with phpseclib, X509::validateSignature() reads a URL out of that certificate's Authority Information Access (AIA) extension and connects to it. Attacker who supplies certificate fully controls host, port, and path of that connection. URL fetching is enabled by default, and no destination is blocked. An unauthenticated attacker can therefore make a validating server open connections to internal hosts and ports it should never reach, for example loopback 127.0.0.1, cloud metadata address 169.254.169.254, and internal-only services. This is a server-side request forgery (SSRF) caused by an insecure default. This vulnerability is fixed in 1.0.30, 2.0.55, and 3.0.54.

Database specific

{
    "cwe_ids": [
        "CWE-918"
    ],
    "cna_assigner": "GitHub_M",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55599.json"
}

References

Affected packages

Git / github.com/phpseclib/phpseclib

Affected ranges

Type

GIT

Repo

https://github.com/phpseclib/phpseclib

Events

Introduced

a8e70cbaa54234d466afdbf6d15d7af1751ce3eb

Fixed

fa867e50b0a523a042800efe3f80f32651d36705

Introduced

a74aa9efbe61430fcb60157c8e025a48ec8ff604

Fixed

d73c9e019a895be83b18a2ccccfa7e2b0a648743

Introduced

fe62c85e0203503231d489af95d0ac053b7d3575

Fixed

5418963581a6d3e69f030d8c972238cb6add3166

Database specific

Show details

{
    "source": "CPE_RANGE",
    "extracted_events": [
        {
            "introduced": "0.1.1"
        },
        {
            "fixed": "1.0.30"
        },
        {
            "introduced": "2.0.0"
        },
        {
            "fixed": "2.0.55"
        },
        {
            "introduced": "3.0.0"
        },
        {
            "fixed": "3.0.54"
        }
    ],
    "cpe": "cpe:2.3:a:phpseclib:phpseclib:*:*:*:*:*:*:*:*"
}

Affected versions

0.*

0.1.1

0.1.2

0.1.5

0.2.0

0.2.1

0.2.2

0.3.0

0.3.6

0.3.7

0.3.8

1.*

1.0.1

1.0.10

1.0.11

1.0.12

1.0.13

1.0.14

1.0.15

1.0.16

1.0.17

1.0.18

1.0.19

1.0.20

1.0.21

1.0.22

1.0.23

1.0.24

1.0.25

1.0.26

1.0.27

1.0.28

1.0.29

1.0.4

1.0.5

1.0.6

1.0.7

1.0.8

1.0.9

2.*

2.0.0

2.0.10

2.0.11

2.0.12

2.0.13

2.0.14

2.0.15

2.0.16

2.0.17

2.0.18

2.0.19

2.0.20

2.0.21

2.0.22

2.0.23

2.0.24

2.0.25

2.0.26

2.0.27

2.0.28

2.0.29

2.0.3

2.0.30

2.0.31

2.0.32

2.0.33

2.0.34

2.0.35

2.0.36

2.0.37

2.0.38

2.0.39

2.0.4

2.0.40

2.0.41

2.0.42

2.0.43

2.0.44

2.0.45

2.0.46

2.0.47

2.0.48

2.0.49

2.0.5

2.0.50

2.0.51

2.0.52

2.0.53

2.0.54

2.0.6

2.0.7

2.0.9

3.*

3.0.0

3.0.1

3.0.10

3.0.11

3.0.12

3.0.13

3.0.14

3.0.15

3.0.16

3.0.17

3.0.18

3.0.19

3.0.2

3.0.20

3.0.21

3.0.22

3.0.23

3.0.3

3.0.33

3.0.34

3.0.35

3.0.36

3.0.37

3.0.38

3.0.39

3.0.4

3.0.40

3.0.41

3.0.42

3.0.43

3.0.44

3.0.45

3.0.46

3.0.47

3.0.48

3.0.49

3.0.5

3.0.50

3.0.51

3.0.52

3.0.53

3.0.6

3.0.7

3.0.8

3.0.9

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55599.json"