Baitaphish
Security intelligence
SearchLatest briefing
CVE Explorer

CVE-2026-45372

cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.44.0, when cpp-httplib's server parses an incoming request, it applies percent-decoding to every header value except Location and Referer. The validity check (is_field_value) is run before decoding, so encoded %0D%0A passes the check and is then expanded to a literal \r\n byte pair inside the stored header value. This vulnerability is fixed in 0.44.0.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:f644ac55a6553e161f4f6517b4d7c891930fd2c8561546c419ce152c1e417218
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 2 assertions

{"cweId":"CWE-93","description":"CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:303477a717285fc67ad943a37e6379b8df40853aceea5335110e09cbd07a9ace · sha256:51d8dbb9720ad357… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-444","description":"CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:303477a717285fc67ad943a37e6379b8df40853aceea5335110e09cbd07a9ace · sha256:51d8dbb9720ad357… · /containers/cna/problemTypes/1/descriptions/0

Affected products and versions

1 source assertion
{"product":"cpp-httplib","vendor":"yhirose","versions":[{"status":"affected","version":"< 0.44.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:303477a717285fc67ad943a37e6379b8df40853aceea5335110e09cbd07a9ace · sha256:51d8dbb9720ad357… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":9.9,"baseSeverity":"CRITICAL","confidentialityImpact":"LOW","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:303477a717285fc67ad943a37e6379b8df40853aceea5335110e09cbd07a9ace · sha256:51d8dbb9720ad357… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

2 source assertions
{"cweId":"CWE-93","description":"CWE-93: Improper Neutralization of CRLF Sequences ('CRLF Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:303477a717285fc67ad943a37e6379b8df40853aceea5335110e09cbd07a9ace · sha256:51d8dbb9720ad357… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-444","description":"CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:303477a717285fc67ad943a37e6379b8df40853aceea5335110e09cbd07a9ace · sha256:51d8dbb9720ad357… · /containers/cna/problemTypes/1/descriptions/0

Source references

2 source assertions
{"tags":["exploit"],"url":"https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-xjxg-64p4-vj4m"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:303477a717285fc67ad943a37e6379b8df40853aceea5335110e09cbd07a9ace · sha256:51d8dbb9720ad357… · /containers/adp/0/references/0
{"name":"https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-xjxg-64p4-vj4m","tags":["x_refsource_CONFIRM"],"url":"https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-xjxg-64p4-vj4m"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:303477a717285fc67ad943a37e6379b8df40853aceea5335110e09cbd07a9ace · sha256:51d8dbb9720ad357… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

← Back to CVE Explorer