CVE-2026-55246Public exploit

Heap corruption via unchecked page-count byte swapping

Published Oct 15, 2026 · Updated Oct 15, 2026

Heap overflow in Tatsh bincookie before 0.1.9 allows attackers to crash applications via crafted binarycookies files. In bincookie.h, bincookie_init_file() uses the unvalidated num_pages field to byte-swap page_sizes entries beyond a file-sized heap allocation. Exposure requires an application to parse an attacker-supplied file; code execution depends on the embedding application's allocator and memory layout.

CVSS severity7.8
High
EPSS probability0.22%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap overflow in Tatsh bincookie before 0.1.9 allows attackers to crash applications via crafted binarycookies files. In bincookie.h, bincookie_init_file() uses the unvalidated num_pages field to byte-swap page_sizes entries beyond a file-sized heap allocation. Exposure requires an application to parse an attacker-supplied file; code execution depends on the embedding application's allocator and memory layout.

The record

CVE
CVE-2026-55246
Published
Oct 15, 2026
Updated
Oct 15, 2026
Vendor
Tatsh
Product
bincookie
Classifications
CWE-787, CWE-122, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 15, 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=< 0.1.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Tatsh · bincookieversion=< 0.1.9

Published CVSS scores

7.8GitHub CNACVSS: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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-122Heap-based Buffer Overflow
T1203Exploitation for Client Execution

Public exploit references

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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