2.9

CVE-2026-73064: trustedfirmware mbed_tls Unexpected Status Code or Return Value

CVSS: 2.9v3.1LowAwaiting analysis
AliasesUBUNTU-CVE-2026-73064DEBIAN-CVE-2026-73064
Published 24-09-2026Last modified 24-09-2026
Open JSON

Vulnerability summary

CVE-2026-73064 is a low (CVSS 2.9) Unexpected Status Code or Return Value vulnerability in trustedfirmware mbed_tls. EPSS estimates a 0.10% chance of exploitation in the next 30 days, higher than 0.9% of scored vulnerabilities.

Overall risk
12/100
0100
Low · default modelHow is this calculated?
CVSS score
2.9/10
010
Low · v3.1 (CVE.org)
EPSS score
0.10%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
MGASA-2026-0375

Timeline

  1. 24-09-2026
    PublishedVulnerability first disclosed.
  2. 24-09-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.10%

Chance of exploitation in the next 30 days

Percentile

1%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

25-09-202619-10-2026
EPSS score
0.10%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • mbedtlsAll versions (No fix recorded) | < 3.6.7-1
Trustedfirmware1 product
  • mbed_tls≥ 3.2.0, < 3.6.7 | ≥ 4.0.0, < 4.1.1
Ubuntu1 product
  • mbedtlsAll versions (No fix recorded)

3 vendors · 3 products

References

5 links