Pillow up to 12.2.x PCF Font Parser PIL/PcfFontFile.py _load_bitmaps memory allocation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.1$0-$5k0.60

Summaryinfo

A vulnerability was found in Pillow up to 12.2.x. It has been classified as problematic. The impacted element is the function _load_bitmaps of the file PIL/PcfFontFile.py of the component PCF Font Parser. The manipulation leads to memory allocation. This vulnerability is listed as CVE-2026-54059. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Pillow up to 12.2.x and classified as problematic. This issue affects the function _load_bitmaps of the file PIL/PcfFontFile.py of the component PCF Font Parser. The manipulation with an unknown input leads to a memory allocation vulnerability. Using CWE to declare the problem leads to CWE-789. The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated. Impacted is availability. The summary by CVE is:

Pillow is a Python imaging library. Prior to 12.3.0, PIL/PcfFontFile.py _load_bitmaps() read glyph dimensions from the PCF METRICS section and passed them directly to Image.frombytes() without calling Image._decompression_bomb_check(), allowing crafted PCF font data to cause excessive memory allocation. This issue is fixed in version 12.3.0.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-54059 since 06/11/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

Upgrading to version 12.3.0 eliminates this vulnerability.

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Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory allocation
CWE: CWE-789 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Upgrade: Pillow 12.3.0

Timelineinfo

06/11/2026 CVE reserved
07/06/2026 +25 days Advisory disclosed
07/06/2026 +0 days VulDB entry created
07/06/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-54059 (🔒)
GCVE (CVE): GCVE-0-2026-54059
GCVE (VulDB): GCVE-100-376493

Entryinfo

Created: 07/06/2026 21:30
Changes: 07/06/2026 21:30 (54)
Complete: 🔍
Cache ID: 216::103

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