CVE-2026-43628Network attack vector

Server crash and sampling corruption via DRY underflow

Published Aug 6, 2026 · Updated Aug 6, 2026

Integer underflow in the DRY sampler in ggml.ai llama.cpp 0.11.0 through 0.17.1 allows remote attackers to crash its server. The server accepts a negative dry_allowed_length from completion JSON and passes it into DRY sampling without a nonnegative bounds check, causing reads before the heap buffer. Unauthenticated access to a completion endpoint is sufficient; the read can terminate the process or distort token-sampling probabilities with unrelated memory values.

CVSS severity8.5
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in the DRY sampler in ggml.ai llama.cpp 0.11.0 through 0.17.1 allows remote attackers to crash its server. The server accepts a negative dry_allowed_length from completion JSON and passes it into DRY sampling without a nonnegative bounds check, causing reads before the heap buffer. Unauthenticated access to a completion endpoint is sufficient; the read can terminate the process or distort token-sampling probabilities with unrelated memory values.

The record

CVE
CVE-2026-43628
Published
Aug 6, 2026
Updated
Aug 6, 2026
Vendor
Georgi Gerganov
Product
llama.cpp
Classifications
CWE-191, CWE-125, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.11.0 <=0.17.1
  2. Affected versionversion=b3978 <=b9058

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Georgi Gerganov · llama.cppversion=0.11.0 <=0.17.1; version=b3978 <=b9058

Published CVSS scores

8.5VulnCheckCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
7.8VulnCheckCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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