DEBIAN-CVE-2026-5477
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.
DEBIAN-CVE-2026-5477
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:DEBIAN-CVE-2026-5477
wolfssl
Source reference: /affected/0/package/name
- Affected versions
- 5.5.4-2
Source reference:
/affected/0/versions5.5.4-2+deb12u1Source reference:
/affected/0/versions5.5.4-2+deb12u2Source reference:
/affected/0/versions5.5.4-2+deb12u3Source reference:
/affected/0/versions5.5.4-2.1Source reference:
/affected/0/versions5.6.4-1Source reference:
/affected/0/versions5.6.4-2Source reference:
/affected/0/versions5.6.6-1Source reference:
/affected/0/versions5.6.6-1.1Source reference:
/affected/0/versions5.6.6-1.2Source reference:
/affected/0/versions5.6.6-1.3Source reference:
/affected/0/versions5.6.6-1.3~exp1Source reference:
/affected/0/versions5.7.0-0.1Source reference:
/affected/0/versions5.7.0-0.2Source reference:
/affected/0/versions5.7.0-0.3Source reference:
/affected/0/versions5.7.2-0.1Source reference:
/affected/0/versions5.7.2-0.2Source reference:
/affected/0/versions5.7.2-0.3Source reference:
/affected/0/versions5.7.2-0.4Source reference:
/affected/0/versions5.8.2-1Source reference:
/affected/0/versions5.8.2-1.1Source reference:
/affected/0/versions5.8.2-1.2Source reference:
/affected/0/versions5.8.4-1Source reference:
/affected/0/versions5.9.0-0.1Source reference:
/affected/0/versions5.9.0-0.2Source reference:
/affected/0/versions5.9.1-0.1Source reference:
/affected/0/versions5.9.2-1Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
wolfssl
Source reference: /affected/1/package/name
- Affected versions
- 5.7.2-0.1
Source reference:
/affected/1/versions5.7.2-0.1+deb13u1Source reference:
/affected/1/versions5.7.2-0.1+deb13u2Source reference:
/affected/1/versions5.7.2-0.2Source reference:
/affected/1/versions5.7.2-0.3Source reference:
/affected/1/versions5.7.2-0.4Source reference:
/affected/1/versions5.8.2-1Source reference:
/affected/1/versions5.8.2-1.1Source reference:
/affected/1/versions5.8.2-1.2Source reference:
/affected/1/versions5.8.4-1Source reference:
/affected/1/versions5.9.0-0.1Source reference:
/affected/1/versions5.9.0-0.2Source reference:
/affected/1/versions5.9.1-0.1Source reference:
/affected/1/versions5.9.2-1Source reference:
/affected/1/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "wolfssl",
"purl": "pkg:deb/debian/wolfssl?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"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",
"5.6.6-1.3~exp1",
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5477.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "wolfssl",
"purl": "pkg:deb/debian/wolfssl?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"5.7.2-0.1",
"5.7.2-0.1+deb13u1",
"5.7.2-0.1+deb13u2",
"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"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5477.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #55901 · Revision 1
- Added to Heist Feed
- Publisher date