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CVE-2026-73064

In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy...

2.9 LowFix available

In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
Low
Availability
None

Exploit likelihood

0.10%Unchanged since Sep 25, 2026
90%50%10%1%

What each source reports

CVE List Score used 2.9

In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.

Record
CVE-2026-73064
CVSS 3.1
2.9 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-394
Updated
2026-11-02
EUVDEUVD-2026-85930 2.9

In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.

Record
EUVD-2026-85930
CVSS 3.1
2.9 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-crc8-r3c8-83vw 2.9

In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy...

In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.

Record
GHSA-crc8-r3c8-83vw
CVSS 3.1
2.9 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-394
Updated
2026-11-02
NVD 2.9

In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.

Record
CVE-2026-73064
CVSS 3.1
2.9 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-394
Updated
2026-11-02
OSV 2.9

In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.

Record
CVE-2026-73064
CVSS 3.1
2.9 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Weakness
CWE-394
Updated
2026-11-02
OSVDEBIAN-CVE-2026-73064 2.9

In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.

Record
DEBIAN-CVE-2026-73064
CVSS 3.1
2.9 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
Show 4 moreShow less
OSVUBUNTU-CVE-2026-73064 2.9

In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.

Record
UBUNTU-CVE-2026-73064
CVSS 3.1
2.9 LowCVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Updated
2026-11-02
OSVAZL-105561 No score

CVE-2026-73064 affecting package nodejs 24.22.1-1

In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.

Record
AZL-105561
Updated
2026-11-05
OSVAZL-105705 No score

CVE-2026-73064 affecting package qemu 10.1.0-1

In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.

Record
AZL-105705
Updated
2026-11-02
OSVMGASA-2026-0375 No score

Updated mbedtls packages fix security vulnerabilities

TLS 1.3 client accepts HelloRetryRequest selecting an unadvertised group. (CVE-2026-25832) Possible buffer overflow in mbedtls_ecdh_calc_secret(). (CVE-2026-35336) X.509 CA bit forgery via invalid basicConstraints extension. (CVE-2026-49300) Use-after-free in mbedtls_pkcs7_free() when reusing a PKCS7 context. (CVE-2026-50579) Remote buffer overflow in TLS 1.2 ECDHE-PSK client handshake. (CVE-2026-50580) Extended master secret calculation failure ignored. (CVE-2026-50581) A 1-byte buffer overread when parsing a malformed ECC public key in the PK module. (CVE-2026-50583) ChaCha20 counter overflow can reuse keystream. (CVE-2026-50584) Incomplete context reset in mbedtls_ssl_session_reset(). (CVE-2026-50585) A potential information disclosure in TLS 1.2 servers using session tickets. If the session ticket write callback failed without setting the lifetime output parameter, Mbed TLS could send 4 bytes of uninitialized stack memory to the peer in the NewSessionTicket message. (CVE-2026-50586) Timing side-channel in RSA PKCS#1 v1.5 decryption. (CVE-2026-50587) Out-of-bounds read in TLS 1.2 EC J-PAKE ServerKeyExchange parsing. (CVE-2026-50588) Ignored TLS 1.3 resumption secret derivation error. (CVE-2026-50640) Heap corruption with early renegotiation after corrupted record in DTLS. (CVE-2026-50713) Side channel leak in ECC optimized modp. (CVE-2026-54435) Signature algorithm restrictions not enforced on certificate chain. (CVE-2026-54441) A random generator fault can compromise TLS data integrity. (CVE-2026-73064)

Record
MGASA-2026-0375
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
nodejs
Azure Linux:3
 through 24.22.1-1 None known
qemu
Azure Linux:3
 through 10.1.0-1 None known
mbedtls
Debian:12
 All versions, plus listed versions
2.28.3-12.28.4-12.28.5-12.28.6-12.28.7-1
Show 18 moreShow less
2.28.7-1.12.28.7-1.1~exp12.28.8-13.6.0-13.6.0-23.6.0-33.6.2-13.6.2-23.6.2-33.6.3-13.6.4-13.6.4-23.6.5-0.13.6.5-0.1~deb13u13.6.6-0.13.6.6-0.1~deb13u13.6.7-23.6.7-3
 None known
mbedtls
Debian:13
 All versions, plus listed versions
3.6.4-23.6.5-0.13.6.5-0.1~deb13u13.6.6-0.13.6.6-0.1~deb13u13.6.7-23.6.7-3
 None known
mbedtls
Debian:14
 before 3.6.7-1, plus listed versions
3.6.4-23.6.5-0.13.6.5-0.1~deb13u13.6.6-0.13.6.6-0.1~deb13u1
3.6.7-1
mbedtls
Mageia:10
From an advisory covering 17 CVEs
 before 3.6.7-1.mga10
3.6.7-1.mga10
mbedtls
Ubuntu:16.04:LTS
 All versions, plus listed versions
2.1.2-12.2.0-12.2.1-12.2.1-22.2.1-2ubuntu0.12.2.1-2ubuntu0.22.2.1-2ubuntu0.3
 None known
mbedtls
Ubuntu:Pro:18.04:LTS
 All versions, plus listed versions
2.5.1-1ubuntu12.6.0-12.7.0-22.8.0-12.8.0-1ubuntu0.1~esm1
 None known
mbedtls
Ubuntu:Pro:20.04:LTS
 All versions, plus listed versions
2.16.2-12.16.3-12.16.4-1ubuntu22.16.4-1ubuntu2+esm1
 None known
mbedtls
Ubuntu:Pro:22.04:LTS
 All versions, plus listed versions
2.16.9-0.1ubuntu12.16.11-0.1ubuntu12.16.11-0.32.28.0-12.28.0-1build12.28.0-1ubuntu0.1~esm1
 None known
mbedtls
Ubuntu:Pro:24.04:LTS
 All versions, plus listed versions
2.28.3-12.28.6-1ubuntu12.28.7-1ubuntu12.28.7-1.1ubuntu12.28.8-12.28.8-1ubuntu0.1~esm1
 None known
mbedtls
Ubuntu:26.10
 All versions, plus listed versions
3.6.5-0.1ubuntu23.6.6-0.1ubuntu13.6.7-3ubuntu1
 None known
mbedtls
Ubuntu:26.04:LTS
 All versions, plus listed versions
3.6.2-3ubuntu13.6.5-0.1ubuntu13.6.5-0.1ubuntu2
 None known

History

History
RecordedChangedSources
affected
affected, factsOSV
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-73064 is a low vulnerability (CVSS 2.9) in Arm Mbed Tls, published September 4, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.10%, the 0th percentile. Fixed in mbedtls 3.6.7-1.

References

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