CVE-2026-45352
- Source
- https://cve.org/CVERecord?id=CVE-2026-45352
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-45352.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-45352
- Aliases
-
- GHSA-h6wq-j5mv-f3q8
- Downstream
- Published
- 2026-05-29T19:14:08.065Z
- Modified
- 2026-07-15T01:49:02.026433565Z
- Severity
-
- 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
- Summary
- cpp-httplib DoS: Negative chunk-size in chunked Transfer-Encoding
- Details
-
cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.43.4, negative chunk-size in chunked Transfer-Encoding causes unbounded memory allocation and process crash. The ChunkedDecoder::readpayload function in cpp-httplib (httplib.h) parses the chunk-size field of HTTP chunked transfer encoding using std::strtoul(). Per the C standard (§7.22.1.4), strtoul silently accepts a leading minus sign, performing unsigned wrap-around: strtoul("-2", …, 16) returns ULONGMAX − 1 (0xFFFFFFFFFFFFFFFE). The library's only guard (line 12833) rejects ULONGMAX (the result of "-1"), but any other negative value such as "-2" passes validation. The resulting near-maximum value is stored in chunkremaining and controls how many bytes the server's read loop consumes from the network. This vulnerability is fixed in 0.43.4.
- Database specific
{ "cna_assigner": "GitHub_M", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/45xxx/CVE-2026-45352.json", "cwe_ids": [ "CWE-1285", "CWE-20", "CWE-770" ] }- References
Affected packages
Git / github.com/yhirose/cpp-httplib
Affected ranges
- Type
- GIT
- Repo
- https://github.com/yhirose/cpp-httplib
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Database specific
{ "cpe": "cpe:2.3:a:yhirose:cpp-httplib:*:*:*:*:*:*:*:*", "source": [ "AFFECTED_FIELD", "CPE_RANGE" ], "extracted_events": [ { "introduced": "0" }, { "fixed": "0.43.4" } ] }