JLSEC-2026-727
- Source
- https://github.com/JuliaLang/SecurityAdvisories.jl/blob/main/advisories/published/2026/JLSEC-2026-727.md
- Import Source
- https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-727.json
- JSON Data
- https://api.osv.dev/v1/vulns/JLSEC-2026-727
- Upstream
- Published
- 2026-07-14T21:41:35.775Z
- Modified
- 2026-07-18T00:02:21.343137581Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
- 8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator
- Summary
- An integer overflow existed in the wolfCrypt CMAC implementation, that could be exploited to...
- Details
-
An integer overflow existed in the wolfCrypt CMAC implementation, that could be exploited to forge CMAC tags. The function wcCmacUpdate used the guard
if (cmac->totalSz != 0)to skip XOR-chaining on the first block (where digest is all-zeros and the XOR is a no-op). However, totalSz is word32 and wraps to zero after 2^28 block flushes (4 GiB), causing the guard to erroneously discard the live CBC-MAC chain state. Any two messages sharing a common suffix beyond the 4 GiB mark then produce identical CMAC tags, enabling a zero-work prefix-substitution forgery. The fix removes the guard, making the XOR unconditional; the no-op property on the first block is preserved because digest is zero-initialized by wcInitCmac_ex. - Database specific
{ "license": "CC-BY-4.0", "sources": [ { "database_specific": { "status": "Analyzed" }, "modified": "2026-06-17T10:59:06.143Z", "published": "2026-04-10T06:16:05.243Z", "imported": "2026-07-17T22:31:41.012Z", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-5477", "html_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-5477", "id": "CVE-2026-5477" }, { "modified": "2026-04-27T18:33:06Z", "published": "2026-04-10T06:31:38Z", "imported": "2026-07-17T22:31:41.164Z", "url": "https://api.github.com/advisories/GHSA-grqc-3vmg-p68x", "html_url": "https://github.com/advisories/GHSA-grqc-3vmg-p68x", "id": "GHSA-grqc-3vmg-p68x" }, { "modified": "2026-04-10T14:04:00Z", "published": "2026-04-10T05:06:22Z", "imported": "2026-07-17T22:31:51.078Z", "url": "https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-21305", "id": "EUVD-2026-21305", "html_url": "https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-21305" } ] }- References