CVE-2025-9300Public exploit

Local crash via palette out-of-bounds read

Published Aug 21, 2025 · Updated Aug 21, 2025

Heap-buffer over-read in saitoha libsixel 1.10.0 through 1.10.3 allows local users to crash img2sixel with a crafted image. In verbose palette output, sixel_debug_print_palette reads palette[i * 3 + 3] as the third color byte, stepping one byte beyond each three-byte entry instead of starting at offset zero. Triggering the fault requires local execution with the verbose and palette-processing options; the demonstrated consequence is an img2sixel abort and a one-byte adjacent-memory read.

CVSS severity7.8
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-buffer over-read in saitoha libsixel 1.10.0 through 1.10.3 allows local users to crash img2sixel with a crafted image. In verbose palette output, sixel_debug_print_palette reads palette[i * 3 + 3] as the third color byte, stepping one byte beyond each three-byte entry instead of starting at offset zero. Triggering the fault requires local execution with the verbose and palette-processing options; the demonstrated consequence is an img2sixel abort and a one-byte adjacent-memory read.

The record

CVE
CVE-2025-9300
Published
Aug 21, 2025
Updated
Aug 21, 2025
Vendor
saitoha
Product
libsixel
Classifications
CWE-121, CWE-119, CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 2025Record 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=1.10.0
  2. Affected versionversion=1.10.1
  3. Affected versionversion=1.10.2
  4. Affected versionversion=1.10.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

saitoha · libsixelversion=1.10.0; version=1.10.1; version=1.10.2; version=1.10.3

Published CVSS scores

1.9VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
5.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
4.3VulDBAV:L/AC:L/Au:S/C:P/I:P/A:P

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-787Out-of-bounds Write

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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