CVE-2026-54874: Excessive Memory Use Buffering DTLS Records for a Future Epoch

Published Aug 25, 2026
·
Updated

Excessive Memory Use Buffering DTLS Records for a Future Epoch

Other sources

Issue summary: Receiving a DTLS record for a future epoch while a handshake is in progress causes OpenSSL to buffer far more memory than the record itself requires.

— Launchpad

Affected Software

16 affected componentsFixes available
OpenSSL OpenSSL<=4.0.1
OpenSSL OpenSSL<=3.6.3
OpenSSL OpenSSL<=3.5.7
OpenSSL OpenSSL<=3.4.6
OpenSSL OpenSSL<=3.0.21
OpenSSL OpenSSL<=1.1.1y
OpenSSL OpenSSL<=1.0.2q
debian/openssl<=1.1.1w-0+deb11u1, <=1.1.1w-0+deb11u8, <=3.0.20-1~deb12u2, <=3.5.6-1~deb13u2, <=3.6.3-1
3.5.7-1~deb13u23.6.4-1
Microsoft azl3 openssl 3.3.7-4<3.3.7-6
3.3.7-6
OpenSSL OpenSSL>=1.0.2<1.0.2zr
OpenSSL OpenSSL>=1.1.1<1.1.1zi
OpenSSL OpenSSL>=3.0.0<3.0.22
OpenSSL OpenSSL>=3.4.0<3.4.7
OpenSSL OpenSSL>=3.5.0<3.5.8
OpenSSL OpenSSL>=3.6.0<3.6.4
OpenSSL OpenSSL>=4.0.0<4.0.2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade debian/openssl to a version that resolves this vulnerability.

    Fixed in 3.5.7-1~deb13u2Fixed in 3.6.4-1
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 3.3.7-6
  3. Upgrade

    Upgrade OpenSSL 1.0.2 to a version that resolves this vulnerability.

    Fixed in OpenSSL 1.0.2zr
  4. Upgrade

    Upgrade OpenSSL 1.1.1 to a version that resolves this vulnerability.

    Fixed in OpenSSL 1.1.1zi
  5. Upgrade

    Upgrade OpenSSL 3.0 to a version that resolves this vulnerability.

    Fixed in OpenSSL 3.0.22
  6. Upgrade

    Upgrade OpenSSL 3.4 to a version that resolves this vulnerability.

    Fixed in OpenSSL 3.4.7
  7. Upgrade

    Upgrade OpenSSL 3.5 to a version that resolves this vulnerability.

    Fixed in OpenSSL 3.5.8
  8. Upgrade

    Upgrade OpenSSL 3.6 to a version that resolves this vulnerability.

    Fixed in OpenSSL 3.6.4
  9. Upgrade

    Upgrade OpenSSL 4.0 to a version that resolves this vulnerability.

    Fixed in OpenSSL 4.0.2
  10. Compensating control

    For OpenSSL DTLS servers, bound exposure by limiting the number of concurrent associations/connections at the application level (since this bounds total exposure when buffering up to 100 early/future-epoch records per connection).

Event History

Aug 25, 2026
CVE Published
via MITRE·12:59 PM
Data Sourced
via MITRE·12:59 PM
DescriptionWeakness
Data Sourced
via NVD·01:19 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·01:19 PM
RemedyAffected Software
Data Sourced
via Launchpad·07:11 PM
Description
Aug 26, 2026
Data Sourced
via Debian·07:12 PM
DescriptionAffected Software
Aug 27, 2026
Data Sourced
via Microsoft·08:10 AM
DescriptionSeverityWeaknessAffected Software
Updated
via Microsoft·08:10 AM
DescriptionSeverity
Updated
via Microsoft·08:10 AM
Affected Software
Data Sourced
via Ubuntu·07:12 PM
RemedyDescriptionSeverityAffected Software

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