DEBIAN-CVE-2026-5477
- Source
- https://security-tracker.debian.org/tracker/CVE-2026-5477
- Import Source
- https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5477.json
- JSON Data
- https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-5477
- Upstream
- Published
- 2026-04-10T06:16:05Z
- Modified
- 2026-09-14T17:03:19Z
- 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
- Summary
- [none]
- Details
-
An integer overflow existed in the wolfCrypt CMAC implementation, that could be exploited to forge CMAC tags. The function wc_CmacUpdate 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 wc_InitCmac_ex. - References
Affected packages
Debian:12 / wolfssl
Package
- Name
- wolfssl
- Purl
- pkg:deb/debian/wolfssl?arch=source&distro=bookworm
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected
Affected versions
5.*
5.5.4-2
5.5.4-2+deb12u1
5.5.4-2+deb12u2
5.5.4-2+deb12u3
5.5.4-2.1
5.6.4-1
5.6.4-2
5.6.6-1
5.6.6-1.1
5.6.6-1.2
5.6.6-1.3~exp1
5.6.6-1.3
5.7.0-0.1
5.7.0-0.2
5.7.0-0.3
5.7.2-0.1
5.7.2-0.2
5.7.2-0.3
5.7.2-0.4
5.8.2-1
5.8.2-1.1
5.8.2-1.2
5.8.4-1
5.9.0-0.1
5.9.0-0.2
5.9.1-0.1
5.9.2-1
Debian:13 / wolfssl
Package
- Name
- wolfssl
- Purl
- pkg:deb/debian/wolfssl?arch=source&distro=trixie
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affected