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CVE.org (no NVD analysis yet)· CNA GitHub_M

CVE-2026-112393: Pillow: Heap buffer overflow in _tiffWriteProc when saving TIFF to BytesIO

Noroxi assessment

Priority: Monitor (action score 36/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1% (FIRST EPSS); higher than 63.6% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
  • Fixed version: python-pillow Pillow 13.0.0.

Low priority for now. Upgrade to python-pillow Pillow 13.0.0 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Pillow is a Python imaging library. From 2.0.0 until 13.0.0, Pillow has a heap buffer overflow and stale-heap disclosure in _tiffWriteProc when saving compressed TIFF data through libtiff to a target without a usable fileno(), such as BytesIO. The callback sizes its allocation from the prior buffer size instead of the current write position, allowing an attacker-controlled out-of-line TIFF tag or retained ICC profile to be copied beyond the allocation after libtiff seeks forward. This overflow can crash the process and may allow code execution. Independently, unwritten alignment gaps in compressed TIFF output larger than 64 KiB can disclose stale heap bytes without a crafted tag. File paths and targets with real file descriptors are unaffected. This issue is fixed in version 13.0.0.

CriticalCVSS 9.2 · v4.0—No exploit Fix available
Published
Oct 19, 2026
Updated
Oct 26, 2026
EPSS
1.0% · 63th percentile

Report tools

JSON

Action score

36

Monitor

Low priority for now.

CVSS
36 / 40 · 9.2 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.0%

CISA SSVC decision

Exploitation
proof of concept
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
9.2
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
pythonpillow

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • python pillow2.0.0 and later · before 13.0.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • python-pillow Pillow

    • >= 2.0.0, < 13.0.0affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:8python3-pillowbefore 5.1.1-36.el8_105.1.1-36.el8_10
AlmaLinux:8python3-pillow-develbefore 5.1.1-36.el8_105.1.1-36.el8_10
AlmaLinux:8python3-pillow-docbefore 5.1.1-36.el8_105.1.1-36.el8_10
AlmaLinux:8python3-pillow-tkbefore 5.1.1-36.el8_105.1.1-36.el8_10
Debian:12pillowfrom 0—
PyPIpillowfrom 2.0.0 · before 13.0.013.0.0
Rocky Linux:8python-pillowbefore 0:5.1.1-36.el8_100:5.1.1-36.el8_10
SUSE:Linux Enterprise Module for Package Hub 15 SP7python-Pillowbefore 7.2.0-150300.3.33.17.2.0-150300.3.33.1

Same product

python: all records

Other highest-scoring records for the same primary product.

  • CVE-2014-3007Python Image Library (PIL) 1.1.7 and earlier and Pillow 2.3 might allow remote attackers to execute arbitrary commands via shell…
    43Plan
  • CVE-2016-4009Integer overflow in the ImagingResampleHorizontal function in libImaging/Resample.c in Pillow before 3.1.1 allows remote attackers to have…
    41Plan
  • CVE-2022-30595libImaging/TgaRleDecode.c in Pillow 9.1.0 has a heap buffer overflow in the processing of invalid TGA image files.
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-112390Oct 19, 2026 · Pillow: Infinite loop in MIC n_frames when the embedded TIFF
    32Monitor
  • ← EarlierCVE-2026-112391Oct 19, 2026 · Pillow: PdfParser can recurse without limit in get_value() and linearize_page_tree()
    25Monitor
  • Later →CVE-2026-112394Oct 19, 2026 · Pillow: P;2L and P;4L decoders may read 1 to 3 bytes past the passed buffer size
    25Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
python-pillow Pillow13.0.0 · descriptionVendor (CNA)
almalinux:python3-pillow5.1.1-36.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:python3-pillow-devel5.1.1-36.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:python3-pillow-doc5.1.1-36.el8_10 · AlmaLinux:8Package registry (OSV)
almalinux:python3-pillow-tk5.1.1-36.el8_10 · AlmaLinux:8Package registry (OSV)
PyPI:pillow13.0.0Package registry (OSV)
rocky linux:python-pillow0:5.1.1-36.el8_10 · Rocky Linux:8Package registry (OSV)
suse:python-Pillow7.2.0-150300.3.33.1 · SUSE:Linux Enterprise Module for Package Hub 15 SP7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 11, 2026+22 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-1123980 days apartPillow: Heap buffer overflow in FlashPix (FPX) JPEG decoding leads to code execution
    36Monitor
  • CVE-2026-1124030 days apartPillow: Heap buffer overflow in ImagingJpegDecode
    36Monitor
  • CVE-2026-1123950 days apartPillow tiled-TIFF decoder reads past tile buffer in copy4 (Unpack.c:1290)
    32Monitor
  • CVE-2025-48379475 days apartPillow Vulnerable to Write Buffer Overflow on BCn encoding
    22Monitor
  • CVE-2026-42309163 days apartPillow: Heap buffer overflow with nested list coordinates
    20Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • Special conditions such as timing or configuration are required.

If successful

Confidentiality
Integrity
Availability
Attack vector
Network
Attack complexity
High
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-122 · Heap-based Buffer Overflow

CVSS vector

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → poc
  2. Exploit maturity— → none
  3. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records