CVE-2026-54874

Aliases:DEBIAN-CVE-2026-54874UBUNTU-CVE-2026-54874ALPINE-CVE-2026-54874CGA-25vr-m7w6-r68vCGA-33pp-w6vx-gh5rCGA-6v5v-f9qh-qxx3CGA-89ch-fw94-ccq4CGA-9h49-ggg5-45q7CGA-cw48-2c94-7jqwCGA-cxw4-gw4q-f4vvCGA-h8g8-p6hw-qxwqCGA-jm4m-fqch-jf5rCGA-mgp3-8g4g-8cggCGA-mwwq-wwpx-3wwvCGA-v2hg-9xv3-g6g6CGA-v9wf-782r-qmm3CGA-wf2q-8p7m-xqvx
Advisory lineage Upstream: 0 Downstream: 21
Analyzed
Published: 25 Aug 2026, 12:59
Last modified:25 Aug 2026, 14:28

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.5 HIGH
v3.1 (cve.org)
EPSS Score
0.52% LOW
1% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

25 Aug 2026, 12:59
Published
Vulnerability first disclosed
25 Aug 2026, 14:28
Last Modified
Vulnerability information updated

Description

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. Impact summary: A peer can use a small amount of network traffic to make an OpenSSL DTLS endpoint retain a disproportionately large amount of memory, which may lead to a Denial of Service. CWE: CWE-405: Asymmetric Resource Consumption (Amplification) Description: While a DTLS handshake is in progress, a peer may legitimately have already moved on to the next epoch (for example, having sent its ChangeCipherSpec and Finished messages) before the local endpoint has processed the same transition, typically because of reordering on the underlying UDP transport. OpenSSL buffers such early records so that they can be processed once the local endpoint catches up. Buffering a record currently retains the entire read buffer it arrived in, which is sized to hold the largest possible DTLS record (around 16 kilobytes), rather than just the bytes that make up the record itself. Up to 100 such records may be buffered per connection. As a result, a peer that sends a stream of small forged records claiming to belong to the next epoch can cause an OpenSSL DTLS endpoint to retain around 1.7 megabytes of memory, despite sending only a small fraction of that amount of data over the network. An attacker therefore gains a memory amplification factor of around 1200, and can multiply the effect across as many associations as it is able to open, making this a remote memory exhaustion Denial of Service risk for DTLS servers. Since the memory retained per connection remains bounded, and any limit an application already places on the number of concurrent associations also bounds the total exposure, this issue has been assessed as Low severity. FIPS impact: no No FIPS modules are affected by this issue as the affected code is outside the OpenSSL FIPS module boundary. OpenSSL 4.0, 3.6, 3.5, 3.4, 3.0, 1.1.1 and 1.0.2 are vulnerable to this issue. OpenSSL 4.0 users should upgrade to OpenSSL 4.0.2. OpenSSL 3.6 users should upgrade to OpenSSL 3.6.4. OpenSSL 3.5 users should upgrade to OpenSSL 3.5.8. OpenSSL 3.4 users should upgrade to OpenSSL 3.4.7. OpenSSL 3.0 users should upgrade to OpenSSL 3.0.22. Premium support customers only: OpenSSL 1.1.1 users should upgrade to OpenSSL 1.1.1zi OpenSSL 1.0.2 users should upgrade to OpenSSL 1.0.2zr This issue was reported on 18 May 2026 by Amazon Web Services. The fix has been developed by Matt Caswell. -- cut (non-publishing metadata for internal use) -- Reported by: Amazon Web Services Fixed by: Matt Caswell

CVSS Metrics

  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.52%• Percentile: 43%

Techniques & Countermeasures

  • CWE-405•Asymmetric Resource Consumption (Amplification)

    The product does not properly control situations in which an adversary can cause the product to consume or produce excessive resources without requiring the adversary to invest equivalent work or otherwise prove authorization, i.e., the adversary's influence is "asymmetric."

Affected Systems

  • alpine•openssl

    < 3.5.8-r0 | < 3.5.8-r0 | < 3.5.8-r0 | ≥ 1.0.2, < 3.5.8-r0 | ≥ 1.0.2, < 3.5.8-r0 | ≥ 1.0.2, < 3.5.8-r0

  • chainguard•eco-python-openssl-4

    all | < 4.0.2-r0

  • chainguard•eco-python-openssl-4-pyca

    all | < 4.0.2-r0

  • chainguard•eco-python-openssl-4-pyca-dev

    all | < 4.0.2-r0

  • chainguard•openssl-provider-fips-3.4.0

    all

  • chainguard•openssl-provider-fips-3.4.0-dbg

    all | < 0

  • chainguard•openssl-provider-fips-3.6.0

    all

  • chainguard•openssl-provider-fips-3.6.0-dbg

    all

  • debian•openssl

    all | all | all | < 3.5.7-1~deb13u2 | < 3.6.4-1

  • ubuntu•edk2

    all | all | all | all | all

  • ubuntu•edk2-hwe

    all

  • ubuntu•nodejs

    all

  • ubuntu•openssl

    < 1.0.1f-1ubuntu2.27+esm16 | < 1.0.2g-1ubuntu4.20+esm18 | all | < 1.1.1-1ubuntu2.1~18.04.23+esm10 | < 1.1.1f-1ubuntu2.24+esm5 | < 3.0.2-0ubuntu1.29 | < 3.0.2-0ubuntu1.29+Fips1 | < 3.0.13-0ubuntu3.15 | < 3.5.5-1ubuntu3.4

  • ubuntu•openssl-fips

    all | < 3.0.13-0ubuntu3.15+Fips1

  • ubuntu•openssl1.0

    < 1.0.2n-1ubuntu5.13+esm6

  • openssl•openssl

    ≥ 1.0.2, < 1.0.2zr | ≥ 1.1.1, < 1.1.1zi | ≥ 3.0.0, < 3.0.22 | ≥ 3.4.0, < 3.4.7 | ≥ 3.5.0, < 3.5.8 | ≥ 3.6.0, < 3.6.4 | ≥ 4.0.0, < 4.0.2

References (14)