CVE-2026-63072
- Source
- https://cve.org/CVERecord?id=CVE-2026-63072
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63072.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-63072
- Downstream
- Related
- Published
- 2026-08-25T12:59:34.428Z
- Modified
- 2026-08-30T08:17:27.444644Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- Heap Buffer Overflow in CMS Key Unwrapping
- Details
-
Issue summary: OpenSSL CMS decryption sizes the key-unwrap output buffer based on querying the unwrapped key size, but the AES-WRAP-PAD unwrap primitive can write and cleanse more bytes than that query reports, causing an 8-byte out-of-bounds heap write.
Impact summary: An attacker who supplies a crafted CMS message can trigger a deterministic 8-byte out-of-bounds heap write when the victim decrypts it with CMS_decrypt(), corrupting the heap and typically resulting in a Denial of Service.
CWE: CWE-787: Out-of-bounds Write
Description: The key-wrap OID is potentially attacker-controlled on the wire. CMS unwrapping allows both id-aesNNN-wrap-pad and id-aesNNN-wrap ciphers. An attacker can take a legitimate message and change a single OID byte to select the padded variant while leaving the message otherwise valid. Since the unwrap key is derived from the recipient's private operation (ECDH key agreement or ML-KEM decapsulation), the RFC 5649 integrity check cannot pass, and the decryption fails with integrity failure.
The write is a fixed-size (8-byte), fixed-value (zero) heap overflow immediately past the allocation, requires no special configuration, and is reachable from the public CMS_decrypt() function. The consequence is a heap corruption leading to a Denial of Service. The fix in the CMS code sizes the unwrap output buffer for the worst case so a failed unwrap cannot write past the allocation.
FIPS impact: no
As the CMS code lives outside the FIPS module boundary, no FIPS modules are affected by this CVE.
- Database specific
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63072.json", "cwe_ids": [ "CWE-787" ], "cna_assigner": "openssl" }- References
-
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63072.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-63072
- https://openssl-library.org/news/secadv/20260825.txt
- https://github.com/openssl/openssl/commit/2a3dac874c8057c1f0186849bf1ede1ae7b6b756
- https://github.com/openssl/openssl/commit/87784ad619af36b8807c2044b3940006fccc1e42
- https://github.com/openssl/openssl/commit/9530a5fd1aacaeccdced4478ea2340a480613335
- https://github.com/openssl/openssl/commit/9ec2f6d2ae2bcad907cf7ee38584855bafe4979a
- https://github.com/openssl/openssl/commit/a0c8ec557d9cac078f032d76cdf684fe743eb382
Affected packages
Git / github.com/openssl/openssl
Affected ranges
- Type
- GIT
- Repo
- https://github.com/openssl/openssl
- Events
-
IntroducedIntroducedIntroducedIntroducedIntroducedIntroducedFixedFixedFixedFixedFixedFixedFixedFixedFixedFixedFixed
- Database specific
-
Show details
{ "source": [ "AFFECTED_FIELD", "REFERENCES" ], "extracted_events": [ { "introduced": "4.0.0" }, { "fixed": "4.0.2" }, { "introduced": "3.6.0" }, { "fixed": "3.6.4" }, { "introduced": "3.5.0" }, { "fixed": "3.5.8" }, { "introduced": "3.4.0" }, { "fixed": "3.4.7" }, { "introduced": "3.0.0" }, { "fixed": "3.0.22" }, { "introduced": "1.1.1" }, { "fixed": "1.1.1zi" } ] }
Affected versions
3.*
3.0-POST-CLANG-FORMAT-WEBKIT
3.0-PRE-CLANG-FORMAT-WEBKIT
3.4-POST-CLANG-FORMAT-WEBKIT
3.4-PRE-CLANG-FORMAT-WEBKIT
3.5-POST-CLANG-FORMAT-WEBKIT
3.5-PRE-CLANG-FORMAT-WEBKIT
3.6-POST-CLANG-FORMAT-WEBKIT
3.6-PRE-CLANG-FORMAT-WEBKIT
openssl-3.*
openssl-3.0.0
openssl-3.0.1
openssl-3.0.10
openssl-3.0.11
openssl-3.0.12
openssl-3.0.13
openssl-3.0.14
openssl-3.0.15
openssl-3.0.16
openssl-3.0.17
openssl-3.0.18
openssl-3.0.19
openssl-3.0.2
openssl-3.0.20
openssl-3.0.21
openssl-3.0.3
openssl-3.0.4
openssl-3.0.5
openssl-3.0.6
openssl-3.0.7
openssl-3.0.8
openssl-3.0.9
openssl-3.4.0
openssl-3.4.1
openssl-3.4.2
openssl-3.4.3
openssl-3.4.4
openssl-3.4.5
openssl-3.4.6
openssl-3.5.0
openssl-3.5.1
openssl-3.5.2
openssl-3.5.3
openssl-3.5.4
openssl-3.5.5
openssl-3.5.6
openssl-3.5.7
openssl-3.6.0
openssl-3.6.1
openssl-3.6.2
openssl-3.6.3
openssl-4.*
openssl-4.0.0
openssl-4.0.1
Database specific
vanir_signatures
[
{
"id": "CVE-2026-63072-055aceb1",
"target": {
"file": "crypto/cms/cms_kari.c"
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"deprecated": false,
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"signature_type": "Line"
},
{
"id": "CVE-2026-63072-08cbc8d9",
"target": {
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},
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},
{
"id": "CVE-2026-63072-2eb41dcb",
"target": {
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},
"deprecated": false,
"digest": {
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},
{
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"target": {
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"file": "crypto/cms/cms_kemri.c"
},
"deprecated": false,
"digest": {
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"signature_type": "Function"
},
{
"id": "CVE-2026-63072-48232a5e",
"target": {
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"file": "crypto/cms/cms_kemri.c"
},
"deprecated": false,
"digest": {
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"signature_type": "Function"
},
{
"id": "CVE-2026-63072-563f42ed",
"target": {
"function": "cms_kek_cipher",
"file": "crypto/cms/cms_kari.c"
},
"deprecated": false,
"digest": {
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"signature_type": "Function"
},
{
"id": "CVE-2026-63072-7dad758a",
"target": {
"file": "crypto/cms/cms_kari.c"
},
"deprecated": false,
"digest": {
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"line_hashes": [
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"signature_type": "Line"
},
{
"id": "CVE-2026-63072-8b81eab8",
"target": {
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},
"deprecated": false,
"digest": {
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"source": "https://github.com/openssl/openssl/commit/9ec2f6d2ae2bcad907cf7ee38584855bafe4979a",
"signature_type": "Line"
},
{
"id": "CVE-2026-63072-947c82fa",
"target": {
"file": "crypto/cms/cms_kemri.c"
},
"deprecated": false,
"digest": {
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},
{
"id": "CVE-2026-63072-9fd87151",
"target": {
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"file": "crypto/cms/cms_kari.c"
},
"deprecated": false,
"digest": {
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{
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"target": {
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"file": "crypto/cms/cms_kari.c"
},
"deprecated": false,
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{
"id": "CVE-2026-63072-c1235256",
"target": {
"file": "crypto/cms/cms_kari.c"
},
"deprecated": false,
"digest": {
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"signature_type": "Line"
},
{
"id": "CVE-2026-63072-c377fa22",
"target": {
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},
"deprecated": false,
"digest": {
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{
"id": "CVE-2026-63072-dd096520",
"target": {
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"file": "crypto/cms/cms_kari.c"
},
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"digest": {
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},
{
"id": "CVE-2026-63072-fd4e40aa",
"target": {
"function": "cms_kek_cipher",
"file": "crypto/cms/cms_kari.c"
},
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"digest": {
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"signature_type": "Function"
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]
source
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63072.json"
vanir_signatures_modified
"2026-08-30T08:17:27Z"