CVEDB API

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-21428

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.30.0, the ``write_headers`` function does not check for CR & LF characters in user supplied headers, allowing untrusted header value to escape header lines. This vulnerability allows attackers to add extra headers, modify request body unexpectedly & trigger an SSRF attack. When combined with a server that supports http1.1 pipelining (springboot, python twisted etc), this can be used for server side request forgery (SSRF). Version 0.30.0 fixes this issue.

Exploit prediction scoring system (EPSS) score

EPSS Score 0.0

EPSS Ranking 3.8%

CVSS Severity

CVSS v3 Score 7.5

References

Products affected by CVE-2026-21428

Yhirose » Cpp-Httplib » Version: N/A

cpe:2.3:a:yhirose:cpp-httplib:-
Yhirose » Cpp-Httplib » Version: 0.10.0

cpe:2.3:a:yhirose:cpp-httplib:0.10.0
Yhirose » Cpp-Httplib » Version: 0.10.1

cpe:2.3:a:yhirose:cpp-httplib:0.10.1
Yhirose » Cpp-Httplib » Version: 0.10.2

cpe:2.3:a:yhirose:cpp-httplib:0.10.2
Yhirose » Cpp-Httplib » Version: 0.10.3

cpe:2.3:a:yhirose:cpp-httplib:0.10.3
Yhirose » Cpp-Httplib » Version: 0.10.4

cpe:2.3:a:yhirose:cpp-httplib:0.10.4
Yhirose » Cpp-Httplib » Version: 0.10.5

cpe:2.3:a:yhirose:cpp-httplib:0.10.5
Yhirose » Cpp-Httplib » Version: 0.10.6

cpe:2.3:a:yhirose:cpp-httplib:0.10.6
Yhirose » Cpp-Httplib » Version: 0.10.7

cpe:2.3:a:yhirose:cpp-httplib:0.10.7
Yhirose » Cpp-Httplib » Version: 0.10.8

cpe:2.3:a:yhirose:cpp-httplib:0.10.8
Yhirose » Cpp-Httplib » Version: 0.10.9

cpe:2.3:a:yhirose:cpp-httplib:0.10.9
Yhirose » Cpp-Httplib » Version: 0.11.0

cpe:2.3:a:yhirose:cpp-httplib:0.11.0
Yhirose » Cpp-Httplib » Version: 0.11.1

cpe:2.3:a:yhirose:cpp-httplib:0.11.1
Yhirose » Cpp-Httplib » Version: 0.11.2

cpe:2.3:a:yhirose:cpp-httplib:0.11.2
Yhirose » Cpp-Httplib » Version: 0.11.3

cpe:2.3:a:yhirose:cpp-httplib:0.11.3
Yhirose » Cpp-Httplib » Version: 0.11.4

cpe:2.3:a:yhirose:cpp-httplib:0.11.4
Yhirose » Cpp-Httplib » Version: 0.12.0

cpe:2.3:a:yhirose:cpp-httplib:0.12.0
Yhirose » Cpp-Httplib » Version: 0.12.1

cpe:2.3:a:yhirose:cpp-httplib:0.12.1
Yhirose » Cpp-Httplib » Version: 0.12.2

cpe:2.3:a:yhirose:cpp-httplib:0.12.2
Yhirose » Cpp-Httplib » Version: 0.12.3

cpe:2.3:a:yhirose:cpp-httplib:0.12.3
Yhirose » Cpp-Httplib » Version: 0.12.4

cpe:2.3:a:yhirose:cpp-httplib:0.12.4
Yhirose » Cpp-Httplib » Version: 0.12.5

cpe:2.3:a:yhirose:cpp-httplib:0.12.5
Yhirose » Cpp-Httplib » Version: 0.12.6

cpe:2.3:a:yhirose:cpp-httplib:0.12.6
Yhirose » Cpp-Httplib » Version: 0.13.0

cpe:2.3:a:yhirose:cpp-httplib:0.13.0
Yhirose » Cpp-Httplib » Version: 0.13.1

cpe:2.3:a:yhirose:cpp-httplib:0.13.1
Yhirose » Cpp-Httplib » Version: 0.13.2

cpe:2.3:a:yhirose:cpp-httplib:0.13.2
Yhirose » Cpp-Httplib » Version: 0.13.3

cpe:2.3:a:yhirose:cpp-httplib:0.13.3
Yhirose » Cpp-Httplib » Version: 0.14.0

cpe:2.3:a:yhirose:cpp-httplib:0.14.0
Yhirose » Cpp-Httplib » Version: 0.14.1

cpe:2.3:a:yhirose:cpp-httplib:0.14.1
Yhirose » Cpp-Httplib » Version: 0.14.2

cpe:2.3:a:yhirose:cpp-httplib:0.14.2
Yhirose » Cpp-Httplib » Version: 0.14.3

cpe:2.3:a:yhirose:cpp-httplib:0.14.3
Yhirose » Cpp-Httplib » Version: 0.15.0

cpe:2.3:a:yhirose:cpp-httplib:0.15.0
Yhirose » Cpp-Httplib » Version: 0.15.1

cpe:2.3:a:yhirose:cpp-httplib:0.15.1
Yhirose » Cpp-Httplib » Version: 0.15.2

cpe:2.3:a:yhirose:cpp-httplib:0.15.2
Yhirose » Cpp-Httplib » Version: 0.15.3

cpe:2.3:a:yhirose:cpp-httplib:0.15.3
Yhirose » Cpp-Httplib » Version: 0.16.0

cpe:2.3:a:yhirose:cpp-httplib:0.16.0
Yhirose » Cpp-Httplib » Version: 0.16.1

cpe:2.3:a:yhirose:cpp-httplib:0.16.1
Yhirose » Cpp-Httplib » Version: 0.16.2

cpe:2.3:a:yhirose:cpp-httplib:0.16.2
Yhirose » Cpp-Httplib » Version: 0.16.3

cpe:2.3:a:yhirose:cpp-httplib:0.16.3
Yhirose » Cpp-Httplib » Version: 0.17.0

cpe:2.3:a:yhirose:cpp-httplib:0.17.0
Yhirose » Cpp-Httplib » Version: 0.17.1

cpe:2.3:a:yhirose:cpp-httplib:0.17.1
Yhirose » Cpp-Httplib » Version: 0.17.2

cpe:2.3:a:yhirose:cpp-httplib:0.17.2
Yhirose » Cpp-Httplib » Version: 0.17.3

cpe:2.3:a:yhirose:cpp-httplib:0.17.3
Yhirose » Cpp-Httplib » Version: 0.18.0

cpe:2.3:a:yhirose:cpp-httplib:0.18.0
Yhirose » Cpp-Httplib » Version: 0.18.1

cpe:2.3:a:yhirose:cpp-httplib:0.18.1
Yhirose » Cpp-Httplib » Version: 0.18.2

cpe:2.3:a:yhirose:cpp-httplib:0.18.2
Yhirose » Cpp-Httplib » Version: 0.18.3

cpe:2.3:a:yhirose:cpp-httplib:0.18.3
Yhirose » Cpp-Httplib » Version: 0.18.4

cpe:2.3:a:yhirose:cpp-httplib:0.18.4
Yhirose » Cpp-Httplib » Version: 0.18.5

cpe:2.3:a:yhirose:cpp-httplib:0.18.5
Yhirose » Cpp-Httplib » Version: 0.18.6

cpe:2.3:a:yhirose:cpp-httplib:0.18.6
Yhirose » Cpp-Httplib » Version: 0.18.7

cpe:2.3:a:yhirose:cpp-httplib:0.18.7
Yhirose » Cpp-Httplib » Version: 0.19.0

cpe:2.3:a:yhirose:cpp-httplib:0.19.0
Yhirose » Cpp-Httplib » Version: 0.2.0

cpe:2.3:a:yhirose:cpp-httplib:0.2.0
Yhirose » Cpp-Httplib » Version: 0.2.1

cpe:2.3:a:yhirose:cpp-httplib:0.2.1
Yhirose » Cpp-Httplib » Version: 0.2.2

cpe:2.3:a:yhirose:cpp-httplib:0.2.2
Yhirose » Cpp-Httplib » Version: 0.2.3

cpe:2.3:a:yhirose:cpp-httplib:0.2.3
Yhirose » Cpp-Httplib » Version: 0.2.4

cpe:2.3:a:yhirose:cpp-httplib:0.2.4
Yhirose » Cpp-Httplib » Version: 0.2.5

cpe:2.3:a:yhirose:cpp-httplib:0.2.5
Yhirose » Cpp-Httplib » Version: 0.2.6

cpe:2.3:a:yhirose:cpp-httplib:0.2.6
Yhirose » Cpp-Httplib » Version: 0.20.0

cpe:2.3:a:yhirose:cpp-httplib:0.20.0
Yhirose » Cpp-Httplib » Version: 0.20.1

cpe:2.3:a:yhirose:cpp-httplib:0.20.1
Yhirose » Cpp-Httplib » Version: 0.21.0

cpe:2.3:a:yhirose:cpp-httplib:0.21.0
Yhirose » Cpp-Httplib » Version: 0.22.0

cpe:2.3:a:yhirose:cpp-httplib:0.22.0
Yhirose » Cpp-Httplib » Version: 0.23.0

cpe:2.3:a:yhirose:cpp-httplib:0.23.0
Yhirose » Cpp-Httplib » Version: 0.23.1

cpe:2.3:a:yhirose:cpp-httplib:0.23.1
Yhirose » Cpp-Httplib » Version: 0.24.0

cpe:2.3:a:yhirose:cpp-httplib:0.24.0
Yhirose » Cpp-Httplib » Version: 0.3.0

cpe:2.3:a:yhirose:cpp-httplib:0.3.0
Yhirose » Cpp-Httplib » Version: 0.3.1

cpe:2.3:a:yhirose:cpp-httplib:0.3.1
Yhirose » Cpp-Httplib » Version: 0.3.2

cpe:2.3:a:yhirose:cpp-httplib:0.3.2
Yhirose » Cpp-Httplib » Version: 0.3.3

cpe:2.3:a:yhirose:cpp-httplib:0.3.3
Yhirose » Cpp-Httplib » Version: 0.4.0

cpe:2.3:a:yhirose:cpp-httplib:0.4.0
Yhirose » Cpp-Httplib » Version: 0.4.1

cpe:2.3:a:yhirose:cpp-httplib:0.4.1
Yhirose » Cpp-Httplib » Version: 0.4.2

cpe:2.3:a:yhirose:cpp-httplib:0.4.2
Yhirose » Cpp-Httplib » Version: 0.5.0

cpe:2.3:a:yhirose:cpp-httplib:0.5.0
Yhirose » Cpp-Httplib » Version: 0.5.1

cpe:2.3:a:yhirose:cpp-httplib:0.5.1
Yhirose » Cpp-Httplib » Version: 0.5.10

cpe:2.3:a:yhirose:cpp-httplib:0.5.10
Yhirose » Cpp-Httplib » Version: 0.5.11

cpe:2.3:a:yhirose:cpp-httplib:0.5.11
Yhirose » Cpp-Httplib » Version: 0.5.12

cpe:2.3:a:yhirose:cpp-httplib:0.5.12
Yhirose » Cpp-Httplib » Version: 0.5.13

cpe:2.3:a:yhirose:cpp-httplib:0.5.13
Yhirose » Cpp-Httplib » Version: 0.5.2

cpe:2.3:a:yhirose:cpp-httplib:0.5.2
Yhirose » Cpp-Httplib » Version: 0.5.3

cpe:2.3:a:yhirose:cpp-httplib:0.5.3
Yhirose » Cpp-Httplib » Version: 0.5.4

cpe:2.3:a:yhirose:cpp-httplib:0.5.4
Yhirose » Cpp-Httplib » Version: 0.5.5

cpe:2.3:a:yhirose:cpp-httplib:0.5.5
Yhirose » Cpp-Httplib » Version: 0.5.6

cpe:2.3:a:yhirose:cpp-httplib:0.5.6
Yhirose » Cpp-Httplib » Version: 0.5.7

cpe:2.3:a:yhirose:cpp-httplib:0.5.7
Yhirose » Cpp-Httplib » Version: 0.5.8

cpe:2.3:a:yhirose:cpp-httplib:0.5.8
Yhirose » Cpp-Httplib » Version: 0.5.9

cpe:2.3:a:yhirose:cpp-httplib:0.5.9
Yhirose » Cpp-Httplib » Version: 0.6.0

cpe:2.3:a:yhirose:cpp-httplib:0.6.0
Yhirose » Cpp-Httplib » Version: 0.6.1

cpe:2.3:a:yhirose:cpp-httplib:0.6.1
Yhirose » Cpp-Httplib » Version: 0.6.2

cpe:2.3:a:yhirose:cpp-httplib:0.6.2
Yhirose » Cpp-Httplib » Version: 0.6.3

cpe:2.3:a:yhirose:cpp-httplib:0.6.3
Yhirose » Cpp-Httplib » Version: 0.6.4

cpe:2.3:a:yhirose:cpp-httplib:0.6.4
Yhirose » Cpp-Httplib » Version: 0.6.5

cpe:2.3:a:yhirose:cpp-httplib:0.6.5
Yhirose » Cpp-Httplib » Version: 0.6.6

cpe:2.3:a:yhirose:cpp-httplib:0.6.6
Yhirose » Cpp-Httplib » Version: 0.6.7

cpe:2.3:a:yhirose:cpp-httplib:0.6.7
Yhirose » Cpp-Httplib » Version: 0.7.0

cpe:2.3:a:yhirose:cpp-httplib:0.7.0
Yhirose » Cpp-Httplib » Version: 0.7.1

cpe:2.3:a:yhirose:cpp-httplib:0.7.1
Yhirose » Cpp-Httplib » Version: 0.7.10

cpe:2.3:a:yhirose:cpp-httplib:0.7.10
Yhirose » Cpp-Httplib » Version: 0.7.11

cpe:2.3:a:yhirose:cpp-httplib:0.7.11
Yhirose » Cpp-Httplib » Version: 0.7.12

cpe:2.3:a:yhirose:cpp-httplib:0.7.12
Yhirose » Cpp-Httplib » Version: 0.7.13

cpe:2.3:a:yhirose:cpp-httplib:0.7.13
Yhirose » Cpp-Httplib » Version: 0.7.14

cpe:2.3:a:yhirose:cpp-httplib:0.7.14
Yhirose » Cpp-Httplib » Version: 0.7.15

cpe:2.3:a:yhirose:cpp-httplib:0.7.15
Yhirose » Cpp-Httplib » Version: 0.7.16

cpe:2.3:a:yhirose:cpp-httplib:0.7.16
Yhirose » Cpp-Httplib » Version: 0.7.17

cpe:2.3:a:yhirose:cpp-httplib:0.7.17
Yhirose » Cpp-Httplib » Version: 0.7.18

cpe:2.3:a:yhirose:cpp-httplib:0.7.18
Yhirose » Cpp-Httplib » Version: 0.7.2

cpe:2.3:a:yhirose:cpp-httplib:0.7.2
Yhirose » Cpp-Httplib » Version: 0.7.3

cpe:2.3:a:yhirose:cpp-httplib:0.7.3
Yhirose » Cpp-Httplib » Version: 0.7.4

cpe:2.3:a:yhirose:cpp-httplib:0.7.4
Yhirose » Cpp-Httplib » Version: 0.7.5

cpe:2.3:a:yhirose:cpp-httplib:0.7.5
Yhirose » Cpp-Httplib » Version: 0.7.6

cpe:2.3:a:yhirose:cpp-httplib:0.7.6
Yhirose » Cpp-Httplib » Version: 0.7.7

cpe:2.3:a:yhirose:cpp-httplib:0.7.7
Yhirose » Cpp-Httplib » Version: 0.7.8

cpe:2.3:a:yhirose:cpp-httplib:0.7.8
Yhirose » Cpp-Httplib » Version: 0.7.9

cpe:2.3:a:yhirose:cpp-httplib:0.7.9
Yhirose » Cpp-Httplib » Version: 0.8.0

cpe:2.3:a:yhirose:cpp-httplib:0.8.0
Yhirose » Cpp-Httplib » Version: 0.8.1

cpe:2.3:a:yhirose:cpp-httplib:0.8.1
Yhirose » Cpp-Httplib » Version: 0.8.2

cpe:2.3:a:yhirose:cpp-httplib:0.8.2
Yhirose » Cpp-Httplib » Version: 0.8.3

cpe:2.3:a:yhirose:cpp-httplib:0.8.3
Yhirose » Cpp-Httplib » Version: 0.8.4

cpe:2.3:a:yhirose:cpp-httplib:0.8.4
Yhirose » Cpp-Httplib » Version: 0.8.5

cpe:2.3:a:yhirose:cpp-httplib:0.8.5
Yhirose » Cpp-Httplib » Version: 0.8.6

cpe:2.3:a:yhirose:cpp-httplib:0.8.6
Yhirose » Cpp-Httplib » Version: 0.8.7

cpe:2.3:a:yhirose:cpp-httplib:0.8.7
Yhirose » Cpp-Httplib » Version: 0.8.8

cpe:2.3:a:yhirose:cpp-httplib:0.8.8
Yhirose » Cpp-Httplib » Version: 0.8.9

cpe:2.3:a:yhirose:cpp-httplib:0.8.9
Yhirose » Cpp-Httplib » Version: 0.9.0

cpe:2.3:a:yhirose:cpp-httplib:0.9.0
Yhirose » Cpp-Httplib » Version: 0.9.1

cpe:2.3:a:yhirose:cpp-httplib:0.9.1
Yhirose » Cpp-Httplib » Version: 0.9.10

cpe:2.3:a:yhirose:cpp-httplib:0.9.10
Yhirose » Cpp-Httplib » Version: 0.9.2

cpe:2.3:a:yhirose:cpp-httplib:0.9.2
Yhirose » Cpp-Httplib » Version: 0.9.3

cpe:2.3:a:yhirose:cpp-httplib:0.9.3
Yhirose » Cpp-Httplib » Version: 0.9.4

cpe:2.3:a:yhirose:cpp-httplib:0.9.4
Yhirose » Cpp-Httplib » Version: 0.9.5

cpe:2.3:a:yhirose:cpp-httplib:0.9.5
Yhirose » Cpp-Httplib » Version: 0.9.6

cpe:2.3:a:yhirose:cpp-httplib:0.9.6
Yhirose » Cpp-Httplib » Version: 0.9.7

cpe:2.3:a:yhirose:cpp-httplib:0.9.7
Yhirose » Cpp-Httplib » Version: 0.9.8

cpe:2.3:a:yhirose:cpp-httplib:0.9.8
Yhirose » Cpp-Httplib » Version: 0.9.9

cpe:2.3:a:yhirose:cpp-httplib:0.9.9

Vulnerabilities

Vulnerable Software

Vulnerability Details CVE-2026-21428

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